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 > Optics



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



Reply
 
LinkBack Thread Tools Display Modes
Old 11-24-2009, 08:00 PM #1
Class 1M Laser
 
Join Date: Sep 2009
Posts: 155
Rep Power: 9
LuxIgnis has a spectacular aura aboutLuxIgnis has a spectacular aura about
LuxIgnis LuxIgnis is offline
Class 1M Laser
 
Join Date: Sep 2009
Posts: 155
Rep Power: 9
LuxIgnis has a spectacular aura aboutLuxIgnis has a spectacular aura about
Default best way to collimate and focus 5w multimode

Hello, I have purchased a 5w C-mount 808nm IR diode.
I'd like to know what lenses to get to focus it to a pinpoint.
I know what I need, a cylinder lens and then a convex to focus it, but I'd like to get the very best to get the smallest dot for burning for cnc use.

I have a 3,2w O-like laser which only has a focusing lens and the result is not very good, the beam diameter is too big and it wants to set everything on fire, rather then finely etching and cutting.

Please help with specific optics to get.


LuxIgnis is offline   Reply With Quote







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







Old 12-01-2009, 05:32 PM #2
Bluefan's Avatar
Class 3R Laser
 
Join Date: Aug 2009
Location: The Netherlands
Posts: 1,482
Rep Power: 62
Bluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond repute
Bluefan Bluefan is offline
Class 3R Laser
Bluefan's Avatar
 
Join Date: Aug 2009
Location: The Netherlands
Posts: 1,482
Rep Power: 62
Bluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond repute
Default Re: best way to collimate and focus 5w multimode

I'd try it with the two lenses, focus with the spherical and then insert the cylindrical somewhere to compensate for the fast axis of the laser. Play around with both and it should work quite good if the optics have the right focal lengths. Can't think of better ways right now, unless you build a single mode YAG laser out of it.

Edit: You do have proper safety goggles do you? It's a class IV and you're playing with optics. I'd recommend a trusted brand goggles manufactor like glendale or EN-207 certified with proper ratings: OD >5 at 808nm, D 808nm L5 at least.

Last edited by Bluefan; 12-01-2009 at 05:34 PM.
Bluefan is offline   Reply With Quote
Old 12-01-2009, 05:49 PM #3
Class 1M Laser
 
Join Date: Sep 2009
Posts: 155
Rep Power: 9
LuxIgnis has a spectacular aura aboutLuxIgnis has a spectacular aura about
LuxIgnis LuxIgnis is offline
Class 1M Laser
 
Join Date: Sep 2009
Posts: 155
Rep Power: 9
LuxIgnis has a spectacular aura aboutLuxIgnis has a spectacular aura about
Default Re: best way to collimate and focus 5w multimode

Hello, thanks for the advice. Would you know where I can buy gless cylinder lenses at a bargain price?
For goggles I have the O-Like 808nm, they seem to be pretty good because they are completely tight around the eyes and because I can't see the beam AT ALL, the instructions say they are OD-5 at 808, so hopefully it should be alright. I might even wear the goggles and still try to focus the beam through a laptop camera, we'll.
The safer the better.
Question though, I thought the cylinder lens would go before the spheric lens, very close to the diode. You say that it can be done the opposite way as well?
Interesting.
LuxIgnis is offline   Reply With Quote
Old 12-01-2009, 05:54 PM #4
Class 1M Laser
 
Join Date: Sep 2009
Posts: 155
Rep Power: 9
LuxIgnis has a spectacular aura aboutLuxIgnis has a spectacular aura about
LuxIgnis LuxIgnis is offline
Class 1M Laser
 
Join Date: Sep 2009
Posts: 155
Rep Power: 9
LuxIgnis has a spectacular aura aboutLuxIgnis has a spectacular aura about
Default Re: best way to collimate and focus 5w multimode

oops, I just found out that the diode is 915nm 4 to 6 whatt 5-8A, does it sound right?
Do you think it's safe to run it at 8A? the diode is ebay item 330379953122.

I also bought from the same guy this item 290371521464,

it's 980nm 2W it should be able to go to 490nm blue with KNbO3 CRYSTAL

Last edited by LuxIgnis; 12-01-2009 at 05:57 PM.
LuxIgnis is offline   Reply With Quote
Old 12-01-2009, 07:24 PM #5
Bluefan's Avatar
Class 3R Laser
 
Join Date: Aug 2009
Location: The Netherlands
Posts: 1,482
Rep Power: 62
Bluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond repute
Bluefan Bluefan is offline
Class 3R Laser
Bluefan's Avatar
 
Join Date: Aug 2009
Location: The Netherlands
Posts: 1,482
Rep Power: 62
Bluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond repute
Default Re: best way to collimate and focus 5w multimode

915 nm is quite far off 808nm, probably too far! 4-6 watts is so much, you'd need OD 5 for 915nm, the O-like isn't rated for that. It may have an OD much lower!
980nm is even more off, no chance yuo're protected against that. Get some wider rated goggles or stay with 808nm.

Note that the conversion efficiency will probably be a bit low if you directly double a diode because of beamprofile issues, although it can be done very nice with some effort.
Bluefan is offline   Reply With Quote
Old 12-01-2009, 07:26 PM #6
Bluefan's Avatar
Class 3R Laser
 
Join Date: Aug 2009
Location: The Netherlands
Posts: 1,482
Rep Power: 62
Bluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond repute
Bluefan Bluefan is offline
Class 3R Laser
Bluefan's Avatar
 
Join Date: Aug 2009
Location: The Netherlands
Posts: 1,482
Rep Power: 62
Bluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond reputeBluefan has a reputation beyond repute
Default Re: best way to collimate and focus 5w multimode

Quote:
Originally Posted by LuxIgnis View Post
Hello, thanks for the advice. Would you know where I can buy gless cylinder lenses at a bargain price?
For goggles I have the O-Like 808nm, they seem to be pretty good because they are completely tight around the eyes and because I can't see the beam AT ALL, the instructions say they are OD-5 at 808, so hopefully it should be alright. I might even wear the goggles and still try to focus the beam through a laptop camera, we'll.
The safer the better.
Question though, I thought the cylinder lens would go before the spheric lens, very close to the diode. You say that it can be done the opposite way as well?
Interesting.
I haven't found a nice source for cylindrical lenses yet, but I haven't really been searching. 808 is barely visible, worry if you can see it!
Focusing in a laptop camera? sounds like a bad idea, you'll fry the camera.
The placing of the lenses depends on the focal length of the lenses and which axis you correct with the cylindrical lens.
Bluefan 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 07:17 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