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 > Science & Lasers



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



Reply
 
LinkBack Thread Tools Display Modes
Old 06-06-2012, 12:56 AM #17
Class 1 Laser
 
Join Date: Jun 2012
Posts: 57
Rep Power: 9
Videogamer555 is just really niceVideogamer555 is just really niceVideogamer555 is just really niceVideogamer555 is just really nice
Videogamer555 Videogamer555 is offline
Class 1 Laser
 
Join Date: Jun 2012
Posts: 57
Rep Power: 9
Videogamer555 is just really niceVideogamer555 is just really niceVideogamer555 is just really niceVideogamer555 is just really nice
Default Re: Why are diode lasers different?

To collimate such a beam properly, you need a lens that first corrects the astigmatism, and then collimates the resulting cirular beam. So you need at least 2 optical components, right?


Videogamer555 is offline   Reply With Quote







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







Old 06-06-2012, 01:03 AM #18
Class 4 Laser
 
Join Date: Nov 2008
Posts: 5,728
Rep Power: 547
ElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond repute
ElektroFreak ElektroFreak is offline
Class 4 Laser
 
Join Date: Nov 2008
Posts: 5,728
Rep Power: 547
ElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond repute
Default Re: Why are diode lasers different?

Correct. The most accepted way to do that is to use an anamorphic prism pair to expand the greater diverging axis only, which drops it's divergence way down since divergence is inversely proportional to initial beam diameter. Then once you've got the profile more-or-less symmetrical you use an ordinary convex lens to collimate the beam as a whole. The order of elements can also be reversed.

Typically, though, this method is used with multimode diodes rather than singlemode, since even though singlemode diodes produce an oval profile they are still easily collimated very well with a simple lens.
__________________
Laser Resources (for n00bs and veterans alike!)

Sam's Laser FAQ (The Laser Bible)

http://www.repairfaq.org/sam/laserfaq.htm

RP Photonics Encyclopedia of Laser Physics and Technology

http://www.rp-photonics.com/encyclopedia.html

ULTIMATE DIY PROJECTOR REFERENCE

http://nqlasers.com/scannerreference...itle=Main_Page

SUCCESS is the best revenge.

Last edited by ElektroFreak; 06-06-2012 at 01:11 AM.
ElektroFreak is offline   Reply With Quote
Old 06-06-2012, 04:57 PM #19
BShanahan14rulz's Avatar
Class 3B Laser
 
Join Date: Dec 2009
Posts: 3,175
Rep Power: 264
BShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond repute
BShanahan14rulz BShanahan14rulz is offline
Class 3B Laser
BShanahan14rulz's Avatar
 
Join Date: Dec 2009
Posts: 3,175
Rep Power: 264
BShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond repute
Default Re: Why are diode lasers different?

Plus, for a laser pointer, who cares about beam profile as long as it's capable of pointing ;-)

Other applications where specifications like beam diameter, shape, and gaussian profile are important to the end result mandate further beam correction
BShanahan14rulz is offline   Reply With Quote
Old 06-07-2012, 02:35 AM #20
Class 1 Laser
 
Join Date: Jun 2012
Posts: 57
Rep Power: 9
Videogamer555 is just really niceVideogamer555 is just really niceVideogamer555 is just really niceVideogamer555 is just really nice
Videogamer555 Videogamer555 is offline
Class 1 Laser
 
Join Date: Jun 2012
Posts: 57
Rep Power: 9
Videogamer555 is just really niceVideogamer555 is just really niceVideogamer555 is just really niceVideogamer555 is just really nice
Default Re: Why are diode lasers different?

Quote:
Originally Posted by BShanahan14rulz View Post
Plus, for a laser pointer, who cares about beam profile as long as it's capable of pointing ;-)

Other applications where specifications like beam diameter, shape, and gaussian profile are important to the end result mandate further beam correction
Actually you do care, because an astigmatic beam can be collimated in one axis, but not the other, and therefore will spread into a line. You have to change the divergence in one or both axes so that they are diverging at exactly the same rate (which will make the beam circular) before using a regular convex lens to collimate the beam.

Also possible would be to use 2 crossed cylindrical lenses. One would collimate it in one direction and the other would collimate it in the other direction. Or you could use one cylindrical lens to correct the divergence of one axis so as to make the divergence the same in both axes, and then use a normal convex lens to collimate the beam.


However I often hear that "3 element" collimation optics are often used for a high quality beam output. I can't imagine any configuration that uses 3 lenses. Why would you ever need 2 use more than 2 lenses? What would the 3rd lens accomplish?

Last edited by Videogamer555; 06-07-2012 at 02:36 AM.
Videogamer555 is offline   Reply With Quote
Old 06-07-2012, 02:49 PM #21
BShanahan14rulz's Avatar
Class 3B Laser
 
Join Date: Dec 2009
Posts: 3,175
Rep Power: 264
BShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond repute
BShanahan14rulz BShanahan14rulz is offline
Class 3B Laser
BShanahan14rulz's Avatar
 
Join Date: Dec 2009
Posts: 3,175
Rep Power: 264
BShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond reputeBShanahan14rulz has a reputation beyond repute
Default Re: Why are diode lasers different?

Don't tell me what I do and don't care about!

What I meant was that in a laser pointer application, a line output is "good 'nuff." Shouldn't be using a beefy high power multimode in a pointer anyways

There are many many ways to correct astigmatism. Some ways are much more cost effective than others. If every single diode had the same divergence ratio, we could just buy 10,000 of one lens, 10,000 of the other, and get a decent discount on them. But I'm not gonna be spending hundreds and hundreds of dollars to correct the beam of my $5 diode

As for the three element aixiz lenses, I don't know, all I can do is guess. They are so small I can barely even tell the difference between meniscus and planoasphere. My guess is that it is kind of like what they do with green lasers, except they use two matched opposites after a collimator, but it doesn't seem too logical in my mind. This paragraph needs a smiley at the end too, to match the rest, I reckon... Always kinda liked this one...

edit: found a diagram of what I am assuming is an aixiz
New 9mm 445 diodes

Last edited by BShanahan14rulz; 06-07-2012 at 04:18 PM.
BShanahan14rulz is offline   Reply With Quote
Old 06-07-2012, 02:59 PM #22
Class 4 Laser
 
Join Date: Nov 2008
Posts: 5,728
Rep Power: 547
ElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond repute
ElektroFreak ElektroFreak is offline
Class 4 Laser
 
Join Date: Nov 2008
Posts: 5,728
Rep Power: 547
ElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond reputeElektroFreak has a reputation beyond repute
Default Re: Why are diode lasers different?

^Lol.. It's definitely true that this is mostly a matter of personal preference in a pointer application, but generally speaking it's VERY easy to get an almost perfectly parallel beam (in both axes) from singlemode diodes. In fact, we routinely see divergence figures that are well below 1mrad from singlemode diodes using only a single collimating lens.

It's the multimode diodes that produce a line output, and the divergence can be quite high when using simple lenses. With these, most people prefer some fast-axis correction, but it's still a matter of personal preference and suitability for a particular application. For example, in my show projectors I'm using the current generation multimode 635nm red and 450nm blue diodes. Because of the longer wavelength, the red diodes have considerably higher fast-axis divergence than the blue diodes. Both are multimode, both produce a line output, but I only correct the fast-axis on the reds. The blues are good enough for my application as they are.
__________________
Laser Resources (for n00bs and veterans alike!)

Sam's Laser FAQ (The Laser Bible)

http://www.repairfaq.org/sam/laserfaq.htm

RP Photonics Encyclopedia of Laser Physics and Technology

http://www.rp-photonics.com/encyclopedia.html

ULTIMATE DIY PROJECTOR REFERENCE

http://nqlasers.com/scannerreference...itle=Main_Page

SUCCESS is the best revenge.

Last edited by ElektroFreak; 06-07-2012 at 02:59 PM.
ElektroFreak 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 09:05 AM.


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