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 > General



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



Reply
 
LinkBack Thread Tools Display Modes
Old 01-22-2017, 07:04 PM #1
fojumdk's Avatar
Member
 
Join Date: Jan 2017
Location: Denmark
Posts: 36
Rep Power: 0
fojumdk has a reputation beyond reputefojumdk has a reputation beyond reputefojumdk has a reputation beyond reputefojumdk has a reputation beyond reputefojumdk has a reputation beyond reputefojumdk has a reputation beyond reputefojumdk has a reputation beyond reputefojumdk has a reputation beyond reputefojumdk has a reputation beyond reputefojumdk has a reputation beyond reputefojumdk has a reputation beyond repute
Send a message via Skype™ to fojumdk
fojumdk fojumdk is offline
Member
fojumdk's Avatar
 
Join Date: Jan 2017
Location: Denmark
Posts: 36
Rep Power: 0
fojumdk has a reputation beyond reputefojumdk has a reputation beyond reputefojumdk has a reputation beyond reputefojumdk has a reputation beyond reputefojumdk has a reputation beyond reputefojumdk has a reputation beyond reputefojumdk has a reputation beyond reputefojumdk has a reputation beyond reputefojumdk has a reputation beyond reputefojumdk has a reputation beyond reputefojumdk has a reputation beyond repute
Send a message via Skype™ to fojumdk
Exclamation Laser ir leak?

So i have this cheap ebay laser from ebay.com
It came from hong kong

I have heard alot about ir leakage?
What is it and how can it damage you?
and is there a way i can test how much ir my laser pointer leaks?

-Fojumdk


__________________
FojumDK

80mw 532nm laser pointer, ebay
100mw 532 YL-laser 303,
fojumdk is offline   Reply With Quote







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







Old 01-22-2017, 09:06 PM #2
Radim's Avatar
Class 3R Laser
 
Join Date: Aug 2016
Location: European Union
Posts: 1,078
Rep Power: 27982
Radim has a reputation beyond reputeRadim has a reputation beyond reputeRadim has a reputation beyond reputeRadim has a reputation beyond reputeRadim has a reputation beyond reputeRadim has a reputation beyond reputeRadim has a reputation beyond reputeRadim has a reputation beyond reputeRadim has a reputation beyond reputeRadim has a reputation beyond reputeRadim has a reputation beyond repute
Radim Radim is online now
Class 3R Laser
Radim's Avatar
 
Join Date: Aug 2016
Location: European Union
Posts: 1,078
Rep Power: 27982
Radim has a reputation beyond reputeRadim has a reputation beyond reputeRadim has a reputation beyond reputeRadim has a reputation beyond reputeRadim has a reputation beyond reputeRadim has a reputation beyond reputeRadim has a reputation beyond reputeRadim has a reputation beyond reputeRadim has a reputation beyond reputeRadim has a reputation beyond reputeRadim has a reputation beyond repute
Default Re: Laser ir leak?

IR is present in many lasers, I assume you have 532 nm - green - there is IR involved from 808 nm pump laser diode and 1064 nm from Nd:YAG (typically) crystal - solid state laser which us pumped by 808 nm. There is also another crystal making 532 nm green from 1064 nm. 808 and 1064 both are considered as IR. If not filtered they might be dangerous as these are invisible and you do not get reference of painful bright light to blink - you will not notice there is something wrong untill it is too late. Be aware as IR might not be colimated as visible output radiation. Also pump laser diode (808) is much stronger than output green due to efficiency issues... You can see if there is a leakage by letting laser hit some diffraction grating like cd or dvd and observe interference patterns - dots laser creates on wall after reflection from disc. Use not IR filtered camera and compare if there are additional dots from what you see with your eye - if so there is no or insuffiecient ir filter. BTW use proper laser safety glasses for this experiment - cheap lasers might be overpowered even if rated 5 mW and under.
__________________
"Lasers are s3xy."
"That feeling when you see colours as their wavelengths."
"Laserpainting is a drug. Do not try it."


Current collection:
405 nm | 500 mW | Wicked Lasers Lunar
445 nm | 3.5 W | Wicked Lasers Arctic
473 nm | 100 mW | Jet Lasers PL-E Pro (Review)
520 nm | 1 W | Wicked Lasers Krypton
532 nm | 100 mW | Wicked Lasers Evo
532 nm | 800 mW | Sky Lasers PL

532 nm | 1.4+ W | Optotronics RPL-II
589 nm | 50 mW | Dragon Lasers Spartan
635 nm | 750 mW | Wicked Lasers Inferno
1 W RGB projector
(+ some laser pointers)

Laserpainting artworks:
LPF thread: Radim's laser painting
Latest laserpainting: Soul in the Surreal world
Instagram: @radimmatera

Please use hashtag #laserpointerforums for laser related stuff when you post on social media to help us promote LPF. Thank you.

Last edited by Radim; 01-22-2017 at 09:14 PM.
Radim is online now   Reply With Quote
Old 01-22-2017, 09:12 PM #3
Rivem's Avatar
Class 2M Laser
 
Join Date: Feb 2016
Location: New Mexico and/or Colorado, USA
Posts: 928
Rep Power: 14434
Rivem has a reputation beyond reputeRivem has a reputation beyond reputeRivem has a reputation beyond reputeRivem has a reputation beyond reputeRivem has a reputation beyond reputeRivem has a reputation beyond reputeRivem has a reputation beyond reputeRivem has a reputation beyond reputeRivem has a reputation beyond reputeRivem has a reputation beyond reputeRivem has a reputation beyond repute
Rivem Rivem is offline
Class 2M Laser
Rivem's Avatar
 
Join Date: Feb 2016
Location: New Mexico and/or Colorado, USA
Posts: 928
Rep Power: 14434
Rivem has a reputation beyond reputeRivem has a reputation beyond reputeRivem has a reputation beyond reputeRivem has a reputation beyond reputeRivem has a reputation beyond reputeRivem has a reputation beyond reputeRivem has a reputation beyond reputeRivem has a reputation beyond reputeRivem has a reputation beyond reputeRivem has a reputation beyond reputeRivem has a reputation beyond repute
Default Re: Laser ir leak?

Quote:
Originally Posted by fojumdk View Post
I have heard alot about ir leakage?
What is it and how can it damage you?
532nm lasers (cheap green ones) use a technology called DPSS (diode-pumped solid state). The laser diode that pumps the solid state (crystal) part of your laser produces quite a lot of 808nm IR light. Some of this gets converted into another IR wavelength by one crystal (usually Nd:YAG), and some of that gets converted into the 532nm green light by another (KTP).

Depending upon how well the laser was made, this IR can escape the laser in large amounts, especially if they lack the IR filter common on most high-end DPSS lasers.

What ends up happening with cheap lasers is that you have basically a green laser beam with a dot in the middle of what's essentially a wider "flashlight" of bright IR light. The IR isn't good for your eyes, and it's hard to know if it's hitting them since it's very hard if not impossible for most people to see. It reflects better than visible light off of some surfaces, and shining the beam in the direction of anybody's face is risky (not that you should do that anyway).

All that said, the IR is more diffuse than the green light, so it poses a bit less of a hazard when handled carefully.

The IR leakage isn't found in any other common wavelength of affordable hobbyist laser unless you consider the yellows affordable.


Quote:
Originally Posted by fojumdk View Post
and is there a way i can test how much ir my laser pointer leaks?
Filters and spectrometers are the most surefire way to tell, but some cameras can sometimes pick the IR up if the laser light is obscured.

Depending upon how good the green beam is, I've put a hole in a sheet of paper and shined beams through it to see the halo of IR on the paper.

EDIT: Radim's test method is better, but please don't attempt something like it without laser safety glasses for your laser.
__________________
Now in the Member Collections Section: Rivem's Collection.


Free after another brutal semester.
I'll still be a bit busy this summer, but expect to see more of me.

Last edited by Rivem; 01-22-2017 at 09:15 PM.
Rivem is offline   Reply With Quote
Reply

Tags
laser pointer, leak





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 07:13 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