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 > 445nm Lasers



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



Reply
 
LinkBack Thread Tools Display Modes
Old 11-14-2015, 04:54 PM #1
Junior Member
 
Join Date: Nov 2015
Posts: 2
Rep Power: 0
AndyRoo is on a distinguished road
AndyRoo AndyRoo is offline
Junior Member
 
Join Date: Nov 2015
Posts: 2
Rep Power: 0
AndyRoo is on a distinguished road
Default 3 watt 445nm lens focus

Hello all,
Im a newby to the laser world and recently built a 3 watt 445nm setup. I have a g2 lense and noticed that the beam goes from a pinpoint to a rectangular shape as distance increases. Is there a way to keep the beam at a pinpoint regardless of distance? I am willing to purchase additional lenses if necessary. My goal is to use up to 250 1x1 inch mirror tiles to reflect the beam and create a "laser beam door."


AndyRoo is offline   Reply With Quote







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







Old 11-14-2015, 06:02 PM #2
RedCowboy's Avatar
Class 3B Laser
 
Join Date: Jul 2015
Location: Suburbs of Atlanta Georgia
Posts: 4,810
Rep Power: 39787
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: 4,810
Rep Power: 39787
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: 3 watt 445nm lens focus

Any laser beam is either expanding or contracting by some amount all of the time.
RedCowboy is online now   Reply With Quote
Old 11-15-2015, 03:42 AM #3
Ricker's Avatar
Class 2M Laser
 
Join Date: Oct 2015
Location: Bangor, Maine
Posts: 510
Rep Power: 15518
Ricker has a reputation beyond reputeRicker has a reputation beyond reputeRicker has a reputation beyond reputeRicker has a reputation beyond reputeRicker has a reputation beyond reputeRicker has a reputation beyond reputeRicker has a reputation beyond reputeRicker has a reputation beyond reputeRicker has a reputation beyond reputeRicker has a reputation beyond reputeRicker has a reputation beyond repute
Ricker Ricker is offline
Class 2M Laser
Ricker's Avatar
 
Join Date: Oct 2015
Location: Bangor, Maine
Posts: 510
Rep Power: 15518
Ricker has a reputation beyond reputeRicker has a reputation beyond reputeRicker has a reputation beyond reputeRicker has a reputation beyond reputeRicker has a reputation beyond reputeRicker has a reputation beyond reputeRicker has a reputation beyond reputeRicker has a reputation beyond reputeRicker has a reputation beyond reputeRicker has a reputation beyond reputeRicker has a reputation beyond repute
Default Re: 3 watt 445nm lens focus

Well, if that's true, PLEASE use safety glasses while constructing this door. Mirrors are so darn easy to accidentally hit yourself with 3w's of laser directly into your retina and burn a hole into it causing permanent damage within one second of exposure. Try these Eagle Pair glasses they are OD 4+ and cover between 190-540nm light spectrum. You can find them HERE. As for lense help, Alaskan is a great resource here and a very nice guy, I'm sure if you ask him nicely he can give you some advice. Have fun!
__________________

Safety: Eagle PairŪ 190-540nm & 800-2000nm Laser Safety Goggles
Misc. Hardware:TENMA 35V/5A Variable Power Supply.
FLIR One Thermal Imaging Camera. Fluke 115 True RMS Digial Multimeter. And Much More!



->My Thermal Imaged Lasers Thread<-
->My First Build!<-
NEW! 2/18/16
Ricker is offline   Reply With Quote
Old 11-15-2015, 02:06 PM #4
Junior Member
 
Join Date: Nov 2015
Posts: 2
Rep Power: 0
AndyRoo is on a distinguished road
AndyRoo AndyRoo is offline
Junior Member
 
Join Date: Nov 2015
Posts: 2
Rep Power: 0
AndyRoo is on a distinguished road
Default

Thank you for the safety advice Ricker, I will be sure to use my glasses at all times. I've noticed that these lasers can be very dangerous and eye protection is a must! As far as the laser door is concerned, I have no detailed plans. However, I noticed the beam can be routed different directions using mirrors..which seemed like a fun idea at the time. I always thought a beam would stay a pinpoint size if focused to infinity. I did not know that the beam spreads out as distance increases, limiting the ability to use mirrors to reflect and reroute the beam because the beam would eventually become wider than the mirror. I'm starting to think that if the beam spreads out over distance (and there is no way to control this using a single lens) I would need additional lenses to refocus the beam at certain distances in order to keep the beam size small enough to reflect off 1x1 inch mirrors several times over and not lose light. Am I on to something here? I feel like a high powered laser and 250 1x1inch mirrors would be a fun way to waste a boring Sunday..

Last edited by AndyRoo; 11-15-2015 at 02:23 PM.
AndyRoo is offline   Reply With Quote
Old 11-15-2015, 09:44 PM #5
Omnipotent
 
Join Date: Jul 2008
Location: Bangor Pennsylvania Untited States
Posts: 1,121
Rep Power: 439
joeyss has a reputation beyond reputejoeyss has a reputation beyond reputejoeyss has a reputation beyond reputejoeyss has a reputation beyond reputejoeyss has a reputation beyond reputejoeyss has a reputation beyond reputejoeyss has a reputation beyond reputejoeyss has a reputation beyond reputejoeyss has a reputation beyond reputejoeyss has a reputation beyond reputejoeyss has a reputation beyond repute
Send a message via AIM to joeyss
joeyss joeyss is offline
Omnipotent
 
Join Date: Jul 2008
Location: Bangor Pennsylvania Untited States
Posts: 1,121
Rep Power: 439
joeyss has a reputation beyond reputejoeyss has a reputation beyond reputejoeyss has a reputation beyond reputejoeyss has a reputation beyond reputejoeyss has a reputation beyond reputejoeyss has a reputation beyond reputejoeyss has a reputation beyond reputejoeyss has a reputation beyond reputejoeyss has a reputation beyond reputejoeyss has a reputation beyond reputejoeyss has a reputation beyond repute
Send a message via AIM to joeyss
Default Re: 3 watt 445nm lens focus

Quote:
Originally Posted by Ricker View Post
Well, if that's true, PLEASE use safety glasses while constructing this door. Mirrors are so darn easy to accidentally hit yourself with 3w's of laser directly into your retina and burn a hole into it causing permanent damage within one second of exposure. Try these Eagle Pair glasses they are OD 4+ and cover between 190-540nm light spectrum. You can find them HERE. As for lense help, Alaskan is a great resource here and a very nice guy, I'm sure if you ask him nicely he can give you some advice. Have fun!
I have 2 sets and I where them both when burning with a 3 watt laser. It blocks so much light I can see combustion and stuff. All it takes is one bright spectacular reflection or even shining threw a window you'll get a few 100mw back reflected so if you don't have googles your eyes are history.
__________________
Chrome 12x 405nm pen @ 475mw by Ra_pierce
~30mw newish 532nm Pen
~100mw IQS 532nm Pen
50mw 660nm DX pen
"5mw" overspec IQS Blu-ray does around 50mw
Spartan 589nm 50mw likely higher no lpm to test but skin feels warm.
3.107 watt 445nm zero laser
473nm labby peak at 34 mw
808nm over a watt from a 400mw green that came loose and lost the crystal set
980nm with weak cyan line focousable
joeyss 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 07:04 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