Laser pointer discussion. Read/write reviews of laser pointers and laser pointer companies. Learn about all types of laser pointers and lasers





Welcome to Laser Pointer Forums! If you are looking for a laser pointer or want to compare different laser pointer companies, you may want to check out the LPF Laser Pointer Company Database. The link will open in a new window for your convenience.








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes
Laser Technology Laser Pointer Parts Lasers by Wavelength
Top 10 Laser Pointer Companies Laser Pointer Company Database Visible Beam Laser Pointers


One laser store meets all your needs

























Go Back   Laser Pointer Forums - Discuss Laser Pointers > Lasers > Tutorials, Help & Repairs



LPF List of Laser Pointer Companies (link opens new window)



Reply
 
LinkBack Thread Tools Display Modes
Old 12-10-2010, 11:41 AM #1
Morgan's Avatar
Class 3R Laser
 
Join Date: Feb 2009
Location: Bedfordshire, UK
Posts: 2,178
Rep Power: 243
Morgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond repute
Morgan Morgan is offline
Class 3R Laser
Morgan's Avatar
 
Join Date: Feb 2009
Location: Bedfordshire, UK
Posts: 2,178
Rep Power: 243
Morgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond repute
Default Polarization expertise please

Hi All,

I have a couple of questions regards polarization please. I will try to be clear in text as I have limited access to pics but I hope you will all be able to understand my queries and offer some insights...

Firstly, the aim here is use PBS cubes to combine two magenta beams. Each single magenta beam will be achieved by using dichros to combine red and blue, (or BR), and then run the two magentas through the cube.

My questions are:

Is polarization directly related to die orientation? I.e. will two dies, of similar diodes, in the same orientation have the same polarization angle and is that angle perpendicular to fast and slow axes?

Illustration -



If the pins show this layout for two diodes, will the polarization angle be the same?



Will this layout show a 90 degree difference in polarization angle for diodes of different wavelengths?



The next question is, (depending on the answer to the first, this may be a moot point), Will different diodes show the same polarization when the pins are are in the same configuration? If we look at the first illustration and assume one is a red LD and one a BR.


Next, Looking at most sleds, if we take the line between the two outer pins, they seem to be aligned in either the x or y axiz with relation to the PBS cubes inside. This leads me to think I could simply align my diodes in this fashion and expect reasonable results without having to, 'tune', their orientation using an LPM before fixing their position. Is this correct?


I hope that's clear enough but if I need to clarify anything then please ask.


Many thanks all,

M


__________________
Do you want to build a laser? But, you know nothing about what is needed, right? Then you need to try the, "I Want to Build a Laser", thread! Everything you wanted to know to get started and more! An easy guide as to what you need and why!

Another good guide can be found here from goninanbl00d - "First Build Guide"
(Temporarily Unavailable)

" ... Lasing on a sunny afternoon." The Kinks.

"Lasing on a Sunday Afternoon." Queen.

" Lase-y Sunday afternoon, I've got no mind to worry... " Small Faces.

"... Yes. It died during the night... So I cooked it! It was very nice." My Dad

Assembly services, parts machined and consultations for specialist builds available. PM me if you need something. Thanks.

Last edited by Morgan; 12-11-2010 at 03:38 PM.
Morgan is offline   Reply With Quote







LPF List of Laser Pointer Companies (link opens new window)







Old 12-10-2010, 12:08 PM #2
532 with Envy's Avatar
Class 3R Laser
 
Join Date: Jun 2010
Location: Somewhere between Here and THere
Posts: 1,491
Rep Power: 576
532 with Envy has a reputation beyond repute532 with Envy has a reputation beyond repute532 with Envy has a reputation beyond repute532 with Envy has a reputation beyond repute532 with Envy has a reputation beyond repute532 with Envy has a reputation beyond repute532 with Envy has a reputation beyond repute532 with Envy has a reputation beyond repute532 with Envy has a reputation beyond repute532 with Envy has a reputation beyond repute532 with Envy has a reputation beyond repute
532 with Envy 532 with Envy is offline
Class 3R Laser
532 with Envy's Avatar
 
Join Date: Jun 2010
Location: Somewhere between Here and THere
Posts: 1,491
Rep Power: 576
532 with Envy has a reputation beyond repute532 with Envy has a reputation beyond repute532 with Envy has a reputation beyond repute532 with Envy has a reputation beyond repute532 with Envy has a reputation beyond repute532 with Envy has a reputation beyond repute532 with Envy has a reputation beyond repute532 with Envy has a reputation beyond repute532 with Envy has a reputation beyond repute532 with Envy has a reputation beyond repute532 with Envy has a reputation beyond repute
Default Re: Polarization expertise please

I have been wondering the same thing here too....
to see if we get an answer. It was my understanding that the orientation of the diode gives you the difference in polarization. One turned 90 degree from the other.
I'm sure someone has the answer here
__________________
_______________________________________________

337.1nm Home Built TEA Laser
HeNe lasers a'plenty.Plus that nice one in the avatar
594nm Melles Griot HeNe
594nm Trius Engineering HeNe
405nm handhelds (diy)
445nm handhelds (diy)
473nm B&W Tek lab style
488nm.40mW Multi-Line Argon Ion laser.....(with thanks to Dave)
515nm Argon Ion laser 40mW
532nm lab style 100mW+handhelds (diy)
543nm Melles Griot HeNe
674nm lab style..500mW
808nm 40W FAP diode array
Kimmon IK4123R-B Helium-Cadmium laser and matching power supply.(with great thanks to Event_Horizon!)(Non-working head...PM me if you have one or information)
532 with Envy is offline   Reply With Quote
Old 12-10-2010, 12:53 PM #3
Class 3R Laser
 
Join Date: Nov 2010
Location: Portugal
Posts: 2,470
Rep Power: 84
anselm has a reputation beyond reputeanselm has a reputation beyond reputeanselm has a reputation beyond reputeanselm has a reputation beyond reputeanselm has a reputation beyond reputeanselm has a reputation beyond reputeanselm has a reputation beyond reputeanselm has a reputation beyond reputeanselm has a reputation beyond reputeanselm has a reputation beyond reputeanselm has a reputation beyond repute
anselm anselm is offline
Class 3R Laser
 
Join Date: Nov 2010
Location: Portugal
Posts: 2,470
Rep Power: 84
anselm has a reputation beyond reputeanselm has a reputation beyond reputeanselm has a reputation beyond reputeanselm has a reputation beyond reputeanselm has a reputation beyond reputeanselm has a reputation beyond reputeanselm has a reputation beyond reputeanselm has a reputation beyond reputeanselm has a reputation beyond reputeanselm has a reputation beyond reputeanselm has a reputation beyond repute
Default Re: Polarization expertise please

Talking out of my ass here, but(t) :
I'd assume all diodes (at least of the same wavelength, maybe even every TO56)
are built in the same way, have their optic cavity oriented the same way, etc.
So among themselves they would be polarized in just the same orientation.

Then if you'd want one passing through and one reflected, they'd have to be
turned 90 degress apart from each other.

Hope that makes some sense. I'm sure someone who actually knows what he's talking
about will correct me on this.
anselm is offline   Reply With Quote
Old 12-10-2010, 01:28 PM #4
HIMNL9's Avatar
Class 4 Laser
 
Join Date: May 2009
Location: Lost somewhere in the EU mess ;)
Posts: 5,416
Rep Power: 404
HIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond repute
HIMNL9 HIMNL9 is offline
Class 4 Laser
HIMNL9's Avatar
 
Join Date: May 2009
Location: Lost somewhere in the EU mess ;)
Posts: 5,416
Rep Power: 404
HIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond repute
Wink Re: Polarization expertise please

The polarization depend from the chip placement, and in the case of LDs, it's the same ..... also, is for this reason, mainly, that there are indentations on the surrounding of the case, so they can be placed always in the same sense in their heatsinks (industrially speaking, ofcourse, not for aixiz modules )

Put the cases in the same orientation, and you will end with the same polarization for all the beams.


EDIT: i realized i gave incomplete informations, sorry.

I suppose you are referring only about light polarization, that is usually indicated also as electrilcal field polarization, and it's parallel to the junction of the chip (there is also a magnetical polarization that is perpendicular to the chip junction, and coplanar with the fast axis).

This polarization is coplanar with the slow axis, and for standard 5,6mm cases, it's normally indicated from the two "V" shaped dents on the borders of the case (the red line in the image is the polarization plane), where usually the "squared" dent indicate the base-plate direction where the chip is soldered (not all the times, anyway, cause some manufacturers places 2 squared dents around the case, instead 1) .

So, yes, "V" shaped dents are more precises, but considering that the pins are usually aligned with enough precision, you can use also them (if they are not too much bent or displaced), for align polarizations.
Attached Thumbnails
Polarization expertise please-case-pol.jpg  
__________________
High Impulse Multipath Neutron Laser (mark 9 ) (LOL)
Dare mo mita koto no nai, kaze, kumo, suna, umi ..... Kokoro no hate no doko ka eien ga kagayaku.

Last edited by HIMNL9; 12-10-2010 at 01:55 PM.
HIMNL9 is offline   Reply With Quote
Old 12-10-2010, 02:13 PM #5
Benm's Avatar
Class 4 Laser
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,427
Rep Power: 15904
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Benm Benm is online now
Class 4 Laser
Benm's Avatar
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,427
Rep Power: 15904
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Default Re: Polarization expertise please

Indeed, the polarization will always be the same relative to the markings on the diode casing for a give type of diode.

For your project you should therefor make 2 magenta beams, one beam with both diodes orientated straight up, and one with both diodes oriented sideways.

Direction of polarization is not incredibly critial though. You will obviously lose power when you get further away from the optimal position. Even if you are off 5 degrees, the loss would be only 1 percent.
Benm is online now   Reply With Quote
Old 12-11-2010, 03:34 PM #6
Morgan's Avatar
Class 3R Laser
 
Join Date: Feb 2009
Location: Bedfordshire, UK
Posts: 2,178
Rep Power: 243
Morgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond repute
Morgan Morgan is offline
Class 3R Laser
Morgan's Avatar
 
Join Date: Feb 2009
Location: Bedfordshire, UK
Posts: 2,178
Rep Power: 243
Morgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond repute
Default Re: Polarization expertise please

@ HIMNL9 and Benm - Perfect expanation guys, +Rep to you both on that one. It is as I suspected but confirmation from those that know is always confidence building and now I know what those, "V", shape indentations indicate too. I would have done the experiments myself but simply didn't have the kit or time to do a proper test and log the outcomes.

One more question that didn't occur to me. Is the same true of DPSS modules? As the 808nm output is converted and, frequency doubled, does the polarization change in the crystal cavities? I know that crystal orientation is crucial for efficient conversion but would a poorly aligned set show a deflection as compared to another module and it's, "V", indentations?

Thanks again,

M
__________________
Do you want to build a laser? But, you know nothing about what is needed, right? Then you need to try the, "I Want to Build a Laser", thread! Everything you wanted to know to get started and more! An easy guide as to what you need and why!

Another good guide can be found here from goninanbl00d - "First Build Guide"
(Temporarily Unavailable)

" ... Lasing on a sunny afternoon." The Kinks.

"Lasing on a Sunday Afternoon." Queen.

" Lase-y Sunday afternoon, I've got no mind to worry... " Small Faces.

"... Yes. It died during the night... So I cooked it! It was very nice." My Dad

Assembly services, parts machined and consultations for specialist builds available. PM me if you need something. Thanks.
Morgan is offline   Reply With Quote
Old 12-11-2010, 03:58 PM #7
Benm's Avatar
Class 4 Laser
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,427
Rep Power: 15904
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Benm Benm is online now
Class 4 Laser
Benm's Avatar
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,427
Rep Power: 15904
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Default Re: Polarization expertise please

I disagree with the above... all green dpps lasers i have are polarized (easily checked with a polarizer). I don't know for sure if there is a defined relationship between the position of the module and the output polarization, but i doubt that would hold true for all dpss modules anyway.

And yes: there is a disticnt relationship between the polarization of the 1064 nm laser and the 532 doubled output, they are orthogonal.

I'm not entirely sure if there is also a relationship between the polarization of the 808 pump diode, and the orientation of the solid state laser. My gut feeling says there must be since the polarization of the pump light is important for performance, but i'm unsure what it is exactly.
Benm is online now   Reply With Quote
Old 12-11-2010, 04:38 PM #8
Morgan's Avatar
Class 3R Laser
 
Join Date: Feb 2009
Location: Bedfordshire, UK
Posts: 2,178
Rep Power: 243
Morgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond repute
Morgan Morgan is offline
Class 3R Laser
Morgan's Avatar
 
Join Date: Feb 2009
Location: Bedfordshire, UK
Posts: 2,178
Rep Power: 243
Morgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond repute
Default Re: Polarization expertise please

Hmmm, okay, I'm taking the reps away! Hehe!

Not so clear cut on the greens then? No problem, I guess I'll have to check that one then. I don't know what Prototype said but I have seen polarisation on all the greens I've had but, of course, never put any figures to what I saw.

Thanks guys, any more input welcomed.

M
__________________
Do you want to build a laser? But, you know nothing about what is needed, right? Then you need to try the, "I Want to Build a Laser", thread! Everything you wanted to know to get started and more! An easy guide as to what you need and why!

Another good guide can be found here from goninanbl00d - "First Build Guide"
(Temporarily Unavailable)

" ... Lasing on a sunny afternoon." The Kinks.

"Lasing on a Sunday Afternoon." Queen.

" Lase-y Sunday afternoon, I've got no mind to worry... " Small Faces.

"... Yes. It died during the night... So I cooked it! It was very nice." My Dad

Assembly services, parts machined and consultations for specialist builds available. PM me if you need something. Thanks.
Morgan is offline   Reply With Quote
Old 12-11-2010, 04:42 PM #9
Prototype's Avatar
Class 3B Laser
 
Join Date: Jun 2009
Posts: 2,712
Rep Power: 107
Prototype has a reputation beyond reputePrototype has a reputation beyond reputePrototype has a reputation beyond reputePrototype has a reputation beyond reputePrototype has a reputation beyond reputePrototype has a reputation beyond reputePrototype has a reputation beyond reputePrototype has a reputation beyond reputePrototype has a reputation beyond reputePrototype has a reputation beyond reputePrototype has a reputation beyond repute
Prototype Prototype is offline
Class 3B Laser
Prototype's Avatar
 
Join Date: Jun 2009
Posts: 2,712
Rep Power: 107
Prototype has a reputation beyond reputePrototype has a reputation beyond reputePrototype has a reputation beyond reputePrototype has a reputation beyond reputePrototype has a reputation beyond reputePrototype has a reputation beyond reputePrototype has a reputation beyond reputePrototype has a reputation beyond reputePrototype has a reputation beyond reputePrototype has a reputation beyond reputePrototype has a reputation beyond repute
Default Re: Polarization expertise please

I erroneously stated that unless you paid for a certain polarization DPSS green, you were probably going to get a randomly polarized module.
Prototype is offline   Reply With Quote
Old 12-11-2010, 05:01 PM #10
Morgan's Avatar
Class 3R Laser
 
Join Date: Feb 2009
Location: Bedfordshire, UK
Posts: 2,178
Rep Power: 243
Morgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond repute
Morgan Morgan is offline
Class 3R Laser
Morgan's Avatar
 
Join Date: Feb 2009
Location: Bedfordshire, UK
Posts: 2,178
Rep Power: 243
Morgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond repute
Default Re: Polarization expertise please

^Ahh, I see. Thanks.

What I was trying to establish was whether I can assume that if I line up the, "V", indents, (or the pins), at the back of a 12mm standard 532nm DPSS modules with a red, blue or BR, whether the polarization would line up in the same way as discussed above.

It would be so convenient if it did work the same but somehow I suspect that just because it would be convenient, it won't be the case!!!

M
__________________
Do you want to build a laser? But, you know nothing about what is needed, right? Then you need to try the, "I Want to Build a Laser", thread! Everything you wanted to know to get started and more! An easy guide as to what you need and why!

Another good guide can be found here from goninanbl00d - "First Build Guide"
(Temporarily Unavailable)

" ... Lasing on a sunny afternoon." The Kinks.

"Lasing on a Sunday Afternoon." Queen.

" Lase-y Sunday afternoon, I've got no mind to worry... " Small Faces.

"... Yes. It died during the night... So I cooked it! It was very nice." My Dad

Assembly services, parts machined and consultations for specialist builds available. PM me if you need something. Thanks.
Morgan is offline   Reply With Quote
Old 12-11-2010, 05:38 PM #11
HIMNL9's Avatar
Class 4 Laser
 
Join Date: May 2009
Location: Lost somewhere in the EU mess ;)
Posts: 5,416
Rep Power: 404
HIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond repute
HIMNL9 HIMNL9 is offline
Class 4 Laser
HIMNL9's Avatar
 
Join Date: May 2009
Location: Lost somewhere in the EU mess ;)
Posts: 5,416
Rep Power: 404
HIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond repute
Default Re: Polarization expertise please

^ Also, if you use a PBS for add the beams, you will forcedly end with one color polarized in one sense, and the other color polarized in the other sense (or, if you add 2 diodes of the same color, with a beam polarized on both the planes), cause is this the way in which PBSs works .....

In the example of the 2 magenta beams, you must use the same polarization for both the couples of red/BR diodes (one couple horizontal and the other couple vertical), checking that the dichros accepts both the polarization planes, and also be sure to use a broadband PBS (not like the ones in PHR sleds, as example, that are polarized dichroic combiners), and then you will end with a magenta polarized on both the planes .....

About the green modules, is difficult to get the polarization plane without make a test with a polarizer filter, cause the polarization depend from the crystal orientation, and the manufacturers don't care to indicate this, on the modules bodies.
__________________
High Impulse Multipath Neutron Laser (mark 9 ) (LOL)
Dare mo mita koto no nai, kaze, kumo, suna, umi ..... Kokoro no hate no doko ka eien ga kagayaku.
HIMNL9 is offline   Reply With Quote
Old 12-11-2010, 06:21 PM #12
Morgan's Avatar
Class 3R Laser
 
Join Date: Feb 2009
Location: Bedfordshire, UK
Posts: 2,178
Rep Power: 243
Morgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond repute
Morgan Morgan is offline
Class 3R Laser
Morgan's Avatar
 
Join Date: Feb 2009
Location: Bedfordshire, UK
Posts: 2,178
Rep Power: 243
Morgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond repute
Default Re: Polarization expertise please

Yes, I had looked into broadband PBS cubes for this reason. Edmund Optics do some. Expensive but maybe I can find them somewhere else too.

I guess the green will be more tricky then. I will put it all into the, "Thought lab", and see what comes out.

M
__________________
Do you want to build a laser? But, you know nothing about what is needed, right? Then you need to try the, "I Want to Build a Laser", thread! Everything you wanted to know to get started and more! An easy guide as to what you need and why!

Another good guide can be found here from goninanbl00d - "First Build Guide"
(Temporarily Unavailable)

" ... Lasing on a sunny afternoon." The Kinks.

"Lasing on a Sunday Afternoon." Queen.

" Lase-y Sunday afternoon, I've got no mind to worry... " Small Faces.

"... Yes. It died during the night... So I cooked it! It was very nice." My Dad

Assembly services, parts machined and consultations for specialist builds available. PM me if you need something. Thanks.
Morgan is offline   Reply With Quote
Old 12-12-2010, 03:13 AM #13
goninanbl00d's Avatar
Class 2M Laser
 
Join Date: Jun 2010
Location: Sydney, AU
Posts: 892
Rep Power: 97
goninanbl00d has a reputation beyond reputegoninanbl00d has a reputation beyond reputegoninanbl00d has a reputation beyond reputegoninanbl00d has a reputation beyond reputegoninanbl00d has a reputation beyond reputegoninanbl00d has a reputation beyond reputegoninanbl00d has a reputation beyond reputegoninanbl00d has a reputation beyond reputegoninanbl00d has a reputation beyond reputegoninanbl00d has a reputation beyond reputegoninanbl00d has a reputation beyond repute
goninanbl00d goninanbl00d is offline
Class 2M Laser
goninanbl00d's Avatar
 
Join Date: Jun 2010
Location: Sydney, AU
Posts: 892
Rep Power: 97
goninanbl00d has a reputation beyond reputegoninanbl00d has a reputation beyond reputegoninanbl00d has a reputation beyond reputegoninanbl00d has a reputation beyond reputegoninanbl00d has a reputation beyond reputegoninanbl00d has a reputation beyond reputegoninanbl00d has a reputation beyond reputegoninanbl00d has a reputation beyond reputegoninanbl00d has a reputation beyond reputegoninanbl00d has a reputation beyond reputegoninanbl00d has a reputation beyond repute
Default Re: Polarization expertise please

About the greens, some are polarised, some aren't. Most times they're randomly polarised, and you don't get a certain polarisation unless you ask the manufacturer.

In order to achieve maximum efficiency, the crystal must be polarisation-matched with the diode. This may or may not mean that the orientation of the diode will be completely random in respect to the crystal. Pump beam polarisation has no effect on output beam polarisation.

However, the output of the SHG optic will always be the same polarisation of the beam to be SHG'd.

You'll have to manually test for output polarisation, each module will be different.

That's why you see the crystal sets epoxied to a mount in cheap modules. Break the crystal set off, and begin to rotate it (wearing 808nm eye protection, of course!). You'll notice at one critical point there'll be a lot more green output. That's the optimal point for the Nd:YVO4, and at this stage the crystal set would be epoxied down at the factory.
goninanbl00d is offline   Reply With Quote
Old 12-12-2010, 11:57 AM #14
Morgan's Avatar
Class 3R Laser
 
Join Date: Feb 2009
Location: Bedfordshire, UK
Posts: 2,178
Rep Power: 243
Morgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond repute
Morgan Morgan is offline
Class 3R Laser
Morgan's Avatar
 
Join Date: Feb 2009
Location: Bedfordshire, UK
Posts: 2,178
Rep Power: 243
Morgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond reputeMorgan has a reputation beyond repute
Default Re: Polarization expertise please

Many thanks gonin!

M
__________________
Do you want to build a laser? But, you know nothing about what is needed, right? Then you need to try the, "I Want to Build a Laser", thread! Everything you wanted to know to get started and more! An easy guide as to what you need and why!

Another good guide can be found here from goninanbl00d - "First Build Guide"
(Temporarily Unavailable)

" ... Lasing on a sunny afternoon." The Kinks.

"Lasing on a Sunday Afternoon." Queen.

" Lase-y Sunday afternoon, I've got no mind to worry... " Small Faces.

"... Yes. It died during the night... So I cooked it! It was very nice." My Dad

Assembly services, parts machined and consultations for specialist builds available. PM me if you need something. Thanks.
Morgan is offline   Reply With Quote
Old 12-12-2010, 01:06 PM #15
Benm's Avatar
Class 4 Laser
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,427
Rep Power: 15904
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Benm Benm is online now
Class 4 Laser
Benm's Avatar
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,427
Rep Power: 15904
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Default Re: Polarization expertise please

I think we should clarify the meaning of 'randomly polarized': It's often used in the same way as 'natural polarization', i.e. the light is a combination of waves of various polarization directions, like the light from the sun or a lightbulb.

But i can see how this can be confusing with 'polarized, but in a random direction' which is, afaik, the case with most green laser modules. Perhaps it is possible to purchase laser modules (i'm thinking lab style here) with a predefined direction of polarization at a premium.
Benm is online now   Reply With Quote
Old 12-12-2010, 02:02 PM #16
HIMNL9's Avatar
Class 4 Laser
 
Join Date: May 2009
Location: Lost somewhere in the EU mess ;)
Posts: 5,416
Rep Power: 404
HIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond repute
HIMNL9 HIMNL9 is offline
Class 4 Laser
HIMNL9's Avatar
 
Join Date: May 2009
Location: Lost somewhere in the EU mess ;)
Posts: 5,416
Rep Power: 404
HIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond repute
Default Re: Polarization expertise please

Well, i'm not 100% sure (memory fades when peoples becomes olds ), but, as far as i remember, vanadate does not alter incoming polarization, where instead KTP rotates it in the doubling process ..... i think it was around 45 degrees (but this for labby cavities with separated crystals, i don't know for sure the angles for "glued" crystals for cheap modules) ..... so, basically there's a little possibility to guess how much the polarization plane is coming out, looking at the diode pins ..... but, cause there's no way for know what working modality the crystal have in a commercial cheap module, and cause for some crystals the polarization changes also changing temperatures (it switch from, say, horizontal, to circular, to vertical, changing the temperature), the only way is to get a polarizer filter (also a cheap photographic one, or an old lens from a pair of polarized sunglasses, can work), and rotate it in front of the module, once it's stabilized in themperature, for know what polarization you're getting from it .....
__________________
High Impulse Multipath Neutron Laser (mark 9 ) (LOL)
Dare mo mita koto no nai, kaze, kumo, suna, umi ..... Kokoro no hate no doko ka eien ga kagayaku.
HIMNL9 is offline   Reply With Quote
Reply





Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On











Loading








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes






Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 09:42 PM.


Powered by: vBulletin
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
Privacy Policy | Advertising Disclaimer | Terms of Use
Copyright (C) 2017 Laser Pointer Forums, LLC