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.




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 > Optics

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



Reply
 
LinkBack Thread Tools Display Modes
Old 11-17-2016, 09:01 PM #33
Class 3R Laser
 
Join Date: Jun 2007
Posts: 1,504
Rep Power: 4714
steve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond repute
steve001 steve001 is offline
Class 3R Laser
 
Join Date: Jun 2007
Posts: 1,504
Rep Power: 4714
steve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond repute
Default Re: correcting a NDG7475

Quote:
Originally Posted by Dr_Evil View Post
Okay, I just want to make sure I'm reading things correctly. Using the 6x cylindrical lens set, I only need those two pieces and a G2 lens? No lens goes after the 6x set? I see the Ebay listing says 35mm between the lenses that come in the set. I assume that is between the front of one and the beck of the other. Since you have a set, can you tell me how thick each piece is? I'd also like to know about how much space is needed between the front of the G2 and back of the first cylindrical lens.

Alaskan, since I can't PM or email you, can you please contact me?
Note: the final beam diameter after correction will determine whether or not a g2 lens is usable. You should use a collimation lens that has a larger diameter than the beam. Placement of the collimation lens is determined by it focal length. To keep divergence low, a long focal length lens should be used.


steve001 is offline   Reply With Quote







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






Old 11-18-2016, 12:10 AM #34
Dr_Evil's Avatar
Class 3R Laser
 
Join Date: Feb 2008
Location: Hartselle, AL
Posts: 2,305
Rep Power: 1359
Dr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond repute
Dr_Evil Dr_Evil is online now
Class 3R Laser
Dr_Evil's Avatar
 
Join Date: Feb 2008
Location: Hartselle, AL
Posts: 2,305
Rep Power: 1359
Dr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond reputeDr_Evil has a reputation beyond repute
Default Re: correcting a NDG7475

Quote:
Originally Posted by steve001 View Post
Note: the final beam diameter after correction will determine whether or not a g2 lens is usable. You should use a collimation lens that has a larger diameter than the beam. Placement of the collimation lens is determined by it focal length. To keep divergence low, a long focal length lens should be used.
You just kind of confused me. The way you wrote that sounds like the collimation lens should be after the correction optics. CDBEAM shows it before the corrections optics. As for the G2, Idon't think ti will be bad considering DTR even offers it as an optional add on.
__________________
645 to 660 - Z-bolt BTP-8E, jayrob C6 w/LOC
638 - JayRob C6 w/ML520G54
635 - Z-bolt BTE-4S
632.8 - 10mW HeNe
589 - PGL-III-C 80mW(100+ peak/average)
543 - GreeNe
532 - Optotronics RPL-260, Optotronics Pen ~20mW
520 - JayRob C6
514 - Argon SL
488 - Novalux
473 - Lasever LSR473HD-80 - 107mW peak
450 - JayRob C6 w/PL450B
445 - JayRob C6
405 - Old Leadlight that Drlava transformed (33mW), 12x in a JayRob C6 host
Multi - 2214-25MLUP ArIon
Dr_Evil is online now   Reply With Quote
Old 11-18-2016, 02:38 AM #35
CDBEAM777's Avatar
Class 2M Laser
 
Join Date: Feb 2010
Posts: 834
Rep Power: 3805
CDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond repute
CDBEAM777 CDBEAM777 is online now
Class 2M Laser
CDBEAM777's Avatar
 
Join Date: Feb 2010
Posts: 834
Rep Power: 3805
CDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond repute
Default Re: correcting a NDG7475

OK...yes...the Collimation lense corrects the beam...just after the diode...then the Cylindrical lenses are placed after the Collimation lens. I believe the G2 lens works best for using on the NDG7475....but....I have not yet tested the G7 ??? I will test in the next month or so. The G2 works great with 6X.

CDBEAM
__________________
Lite'em Up CDBEAM=======>...and....
"Robby...Where have you been? I've beamed and beamed "

Solar Prominence-Laser Lumia combined with audio http://laserpointerforums.com/f47/laser-lumia-terrawatt-labs-97261.html
CYAN CANNON V BUILD-Green + Blue = Photon Cannon - Build resumed http://laserpointerforums.com/f49/cy...ild-94999.html
Titanium Cyprus TRI EDC with 520 nm and GITD Europium barrel rings-Completed http://laserpointerforums.com/f45/my...t-94978-2.html
TRIDENTIS BUILD-Three (3) 445 Combiner-Knife edge-Completed http://laserpointerforums.com/f65/tr...uty-83781.html
DRAGON'S HEAD BUILD-Optically corrected P73-Completed http://laserpointerforums.com/f50/no...ign-87235.html
Purple pHAZE Combiner - Red + Blue = Purple-Completed http://laserpointerforums.com/f42/pu...ple-93717.html
Sky Blue Ramjet-Corrected NUBMO7E- Completed http://laserpointerforums.com/f42/sk...ild-94646.html
Check out http://www.hobbylasers.com/

Last edited by CDBEAM777; 11-18-2016 at 02:43 AM.
CDBEAM777 is online now   Reply With Quote
Old 11-18-2016, 02:55 AM #36
CDBEAM777's Avatar
Class 2M Laser
 
Join Date: Feb 2010
Posts: 834
Rep Power: 3805
CDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond repute
CDBEAM777 CDBEAM777 is online now
Class 2M Laser
CDBEAM777's Avatar
 
Join Date: Feb 2010
Posts: 834
Rep Power: 3805
CDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond repute
Default Re: correcting a NDG7475

OK...I have tested a set of 6X Cylindrical lenses vs. a set of Opt Cylindrical lenses specified for the NDG7475....And...I just added a set of 6X from Lazereer ( Which are no longer available I think )

Interesting !!! The Opt worked better than I rembered...but not quite as good as the 6X.

See here...Tests we made at 1A current to the NDG7475.

6x Cylindricals/Lazereer Cylindricals

@ 0 Meter Beam width = 2.5mm
@ 7 Meter Beam width = 5.8mm

mRad = 0.472


Opt Laser Cylindricals

@ 0 Meter Beam width = 2.5mm
@ 7 Meter Beam width = 7.0mm

mRad = 0.643

SOooo... the 6X are a little better....and the further down beam one travels... from the diode output to the Far Field beam geometry target...the greater the benefit of using a 6X will present with a lesser width ( more a dot ).

I still like the geometry perimeter of the Opt Laser Cylindrical lenses a bit more than the 6X from LSP/AJAI... in that both lenses are the same size. This same size perimeter makes for a more simplified Cylindrical lens mount

So...you choose !! BOTH mRad metrics are very good....but the 6X is superior.

See attached pic of my set ups.

Note: a 7M ( 23')....when using the 6X lenses...the beam presents something very close to a circle (looks like a circle to me). In reality...the geometry is a round cornered rectangle. I tried taking pics...but the spot is just too bright.

CDBEAM
Attached Thumbnails
correcting a NDG7475-opt-laser-cylindrical-test-1.jpg   correcting a NDG7475-6x-cylindrical-test-1.jpg   correcting a NDG7475-cylindrical-test-lazereer.jpg  
__________________
Lite'em Up CDBEAM=======>...and....
"Robby...Where have you been? I've beamed and beamed "

Solar Prominence-Laser Lumia combined with audio http://laserpointerforums.com/f47/laser-lumia-terrawatt-labs-97261.html
CYAN CANNON V BUILD-Green + Blue = Photon Cannon - Build resumed http://laserpointerforums.com/f49/cy...ild-94999.html
Titanium Cyprus TRI EDC with 520 nm and GITD Europium barrel rings-Completed http://laserpointerforums.com/f45/my...t-94978-2.html
TRIDENTIS BUILD-Three (3) 445 Combiner-Knife edge-Completed http://laserpointerforums.com/f65/tr...uty-83781.html
DRAGON'S HEAD BUILD-Optically corrected P73-Completed http://laserpointerforums.com/f50/no...ign-87235.html
Purple pHAZE Combiner - Red + Blue = Purple-Completed http://laserpointerforums.com/f42/pu...ple-93717.html
Sky Blue Ramjet-Corrected NUBMO7E- Completed http://laserpointerforums.com/f42/sk...ild-94646.html
Check out http://www.hobbylasers.com/

Last edited by CDBEAM777; 11-18-2016 at 11:56 PM. Reason: Added another set of Cylindrical lenses
CDBEAM777 is online now   Reply With Quote
Old 11-18-2016, 06:31 AM #37
Alaskan's Avatar
Class 4 Laser
 
Join Date: Jan 2014
Location: Southwest Asia
Posts: 6,685
Rep Power: 21093
Alaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond repute
Alaskan Alaskan is offline
Class 4 Laser
Alaskan's Avatar
 
Join Date: Jan 2014
Location: Southwest Asia
Posts: 6,685
Rep Power: 21093
Alaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond repute
Default Re: correcting a NDG7475

Thank you very much for the info Robert, that took some work to set up and measure, not just a five minute check of something. I am surprised 6X is better, if expanding the slow axis, I expected it was too much X and would cause the slow axis diameter to be larger than the fast, at distance. Good thing I have four sets of those 6X pairs Glutton had a group buy on, I will use them in time.

Quote:
Originally Posted by Dr_Evil View Post
You just kind of confused me. The way you wrote that sounds like the collimation lens should be after the correction optics.
I thought I'd chime in here to explain what is happening differently.

The first lens of the cylinder pair expands one side of the beam, the second lens re-collimates it back to infinity focus.

Normally, almost always, the beam must be fully collimated to infinity focus before going through the lens pair. The beam can be out of infinity focus some, but not much. If it is, a small adjustment of the distance between the pair of cylinder lenses can make up for that, but there isn't much room to do so and if too far out, not going to happen.
__________________

The forum costs more to run than donations received, if you wish to help click this link: http://laserpointerforums.com/donations.htm

Laser Safety: http://www.laserpointersafety.com/index.html

Sam's Laser FAQ: Sam's Laser FAQ: Welcome Page

RHD's Relative Perceived Brightness Calculator. Compare brightness @nm: http://lsrtools.1apps.com/relativebrightness

To shorten my signature I have moved most of my laser related web links to this forum page, the second post in that thread shows most of my builds... Alaskan's Laser Links: http://laserpointerforums.com/f44/al...ml#post1449395


Sincerely investigate any of these three short quotes as new concepts and you've taken your first step into a larger world:

"I regard consciousness as fundamental. I regard matter as derivative from consciousness..." - Max Planck. "Everything we call real is made of things that cannot be regarded as real" - Neils Bohr. "What we call physical things and events do not exist independently of subjective experience..." - Deepak Chopra.

Each of these three rabbit holes go deep, ending up in the same place.

Useless troll fighting.

Last edited by Alaskan; 11-18-2016 at 06:33 AM. Reason: combining posts
Alaskan is offline   Reply With Quote
Old 11-18-2016, 01:41 PM #38
Class 3R Laser
 
Join Date: Jun 2007
Posts: 1,504
Rep Power: 4714
steve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond repute
steve001 steve001 is offline
Class 3R Laser
 
Join Date: Jun 2007
Posts: 1,504
Rep Power: 4714
steve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond repute
Default Re: correcting a NDG7475

Quote:
Originally Posted by Dr_Evil View Post
You just kind of confused me. The way you wrote that sounds like the collimation lens should be after the correction optics. CDBEAM shows it before the corrections optics. As for the G2, Idon't think ti will be bad considering DTR even offers it as an optional add on.
Both ways may be doable. Experiment.
I've read another thread where a beam expander is used after beam shaping optics. I think however using a short focal length lens, G lenses are that, before beam shaping optics will limit the final minimum divergence. If shaping the beam is the entire goal then forget what I said.
I found this free download Ebook via Youtube. Laser Beam Shaping Applications (Optical Science and Engineering) Download eBook Laser Beam Shaping Applications (Optical Science and Engineering)
steve001 is offline   Reply With Quote
Old 11-18-2016, 02:27 PM #39
CDBEAM777's Avatar
Class 2M Laser
 
Join Date: Feb 2010
Posts: 834
Rep Power: 3805
CDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond repute
CDBEAM777 CDBEAM777 is online now
Class 2M Laser
CDBEAM777's Avatar
 
Join Date: Feb 2010
Posts: 834
Rep Power: 3805
CDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond reputeCDBEAM777 has a reputation beyond repute
Default Re: correcting a NDG7475

Alaskan,

Glad to do these things. Nothing like experimenting to see what actually is good, better or best.

I just happen to have the Opt Laser lenses....and the 6X were from an old group buy...they are large....but are 6X. The Copper holder is from recent testing I have been doing to get a perfect friction fit between the 12mm module OD and a CU Heat sink. SO...sometimes all things just come together....and a quick experiment pops out...besides...Dr. Evil was " Tapping his toe " hahahaha

I am a real Hack Optical " Gueroo "....I know enough to be dangerous...and the rest...I just experiment and wing it !!

Steve,

Thanx for the link to optic info...hahaha..." As though his ape's brain could understand the secret's of the Krell "
!!!

Later...CDBEAM
__________________
Lite'em Up CDBEAM=======>...and....
"Robby...Where have you been? I've beamed and beamed "

Solar Prominence-Laser Lumia combined with audio http://laserpointerforums.com/f47/laser-lumia-terrawatt-labs-97261.html
CYAN CANNON V BUILD-Green + Blue = Photon Cannon - Build resumed http://laserpointerforums.com/f49/cy...ild-94999.html
Titanium Cyprus TRI EDC with 520 nm and GITD Europium barrel rings-Completed http://laserpointerforums.com/f45/my...t-94978-2.html
TRIDENTIS BUILD-Three (3) 445 Combiner-Knife edge-Completed http://laserpointerforums.com/f65/tr...uty-83781.html
DRAGON'S HEAD BUILD-Optically corrected P73-Completed http://laserpointerforums.com/f50/no...ign-87235.html
Purple pHAZE Combiner - Red + Blue = Purple-Completed http://laserpointerforums.com/f42/pu...ple-93717.html
Sky Blue Ramjet-Corrected NUBMO7E- Completed http://laserpointerforums.com/f42/sk...ild-94646.html
Check out http://www.hobbylasers.com/
CDBEAM777 is online now   Reply With Quote
Old 03-02-2017, 10:54 AM #40
RedCowboy's Avatar
Class 3B Laser
 
Join Date: Jul 2015
Location: Suburbs of Atlanta Georgia
Posts: 4,570
Rep Power: 18502
RedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond repute
RedCowboy RedCowboy is online now
Class 3B Laser
RedCowboy's Avatar
 
Join Date: Jul 2015
Location: Suburbs of Atlanta Georgia
Posts: 4,570
Rep Power: 18502
RedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond repute
Default Re: correcting a NDG7475

Dam, I thought the NDG7475 was about like the NDB7875, but apparently it's much worse, is it slightly better or worse than a NDB7A75?
__________________
You can not put freedom in a bag.
It is in fact an abstract concept.
Yet it is the single most valuable thing anyone has ever had.
RedCowboy is online now   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 10:30 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