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 06-14-2008, 04:27 AM #1
Schrecken_Licht's Avatar
Class 2M Laser
 
Join Date: Feb 2008
Location: Maryland, USA
Posts: 573
Rep Power: 33
Schrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond repute
Schrecken_Licht Schrecken_Licht is offline
Class 2M Laser
Schrecken_Licht's Avatar
 
Join Date: Feb 2008
Location: Maryland, USA
Posts: 573
Rep Power: 33
Schrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond repute
Default Sensitivity threshold of various laser wavelengths

Here's a question for anyone with several reasonably high-powered lasers in the red and near-IR wavelengths: What is the mw threshold for being able to detect heat from the laser beam on your skin?

For instance, I have a 660nm laser doing about 170mw, and I can't feel the beam at all, even when focused. I have a med-fair typical caucasian skin tone, BTW. I can easily feel the beam of my 125mw green pointer (and REALLY feel the beam of my 405mw greenie!), and also my 131mw blue laser (but not my argon - I think it's doing a little under 100mw).

How much power would it take for a person with average med-fair skin tone to feel a 660, 635, 808, or even 1.064nm laser beam? Let's assume the beam is unfocused and has the divergence of a typical green laser (unrealistic for the IR, but for the sake of argument....).
I know there are lots of variables here, but how much power do you need to be able to get a "sting" from a red or near IR laser?


__________________
Ultimate Laser Destruction! http://www.youtube.com/watch?v=wEaB7rwnyZc
The Beast: http://www.youtube.com/watch?v=0xl4c1B5Kao
Schrecken_Licht is offline   Reply With Quote







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







Old 06-14-2008, 07:29 AM #2
Junior Member
 
Join Date: May 2008
Posts: 22
Rep Power: 0
NovoRei is on a distinguished road
NovoRei NovoRei is offline
Junior Member
 
Join Date: May 2008
Posts: 22
Rep Power: 0
NovoRei is on a distinguished road
Default Re: Sensitivity threshold of various laser wavelen

Just because you dont feel the laser, dont mean its not burning something(maybe your muscle or bone).

Its just like a worm in your head, you dont feel, no pain.
NovoRei is offline   Reply With Quote
Old 06-14-2008, 09:56 AM #3
Switch's Avatar
Class 3B Laser
 
Join Date: Dec 2007
Posts: 3,327
Rep Power: 166
Switch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond repute
Switch Switch is offline
Class 3B Laser
Switch's Avatar
 
Join Date: Dec 2007
Posts: 3,327
Rep Power: 166
Switch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond repute
Default Re: Sensitivity threshold of various laser wavelen

No , it's actually getting reflected and scattered through the skin layers so the energy density is very low on nerve endigs.Don't worry about your bones being burnt. :

I am usually white as a ghost, but being summer I have a bit of a tan.My red laser(which is doing bellow 170mW right now because of drained batteries) can be felt when focused after 1 or 2 seconds on my arm, but not on my "white parts" .So I guess your skin tone matters a lot.

Aseras has a video of him pointing a crystalless RPL doing 2.9W at his hand with no effect.

To sumarize, I guess it's really hard to tell because it depends a lot on your skintone and how focused the laser is.
Switch is offline   Reply With Quote
Old 06-14-2008, 10:58 AM #4
GooeyGus's Avatar
Class 3B Laser
 
Join Date: Mar 2008
Posts: 2,673
Rep Power: 970
GooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond repute
Send a message via AIM to GooeyGus Send a message via MSN to GooeyGus
GooeyGus GooeyGus is offline
Class 3B Laser
GooeyGus's Avatar
 
Join Date: Mar 2008
Posts: 2,673
Rep Power: 970
GooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond repute
Send a message via AIM to GooeyGus Send a message via MSN to GooeyGus
Default Re: Sensitivity threshold of various laser wavelen

I've found skin does a wonderful job reflecting IR light. I've had a few high power c-mount diodes at 808nm that I couldn't feel at all, and we're talking a couple watts here. I'm sure this is also why no one is really worried about IR light as far as skin goes. UV can cause cancer because it is readily absorbed by the skin. IR bounces right off as if we were mirrors. I'm sure this has to do with the fact that IR photons themselves carry less energy due to the longer wavelength, thus they cant penetrate.
GooeyGus is offline   Reply With Quote
Old 06-14-2008, 11:45 AM #5
Switch's Avatar
Class 3B Laser
 
Join Date: Dec 2007
Posts: 3,327
Rep Power: 166
Switch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond repute
Switch Switch is offline
Class 3B Laser
Switch's Avatar
 
Join Date: Dec 2007
Posts: 3,327
Rep Power: 166
Switch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond repute
Default Re: Sensitivity threshold of various laser wavelen

Actually they penetrate more than the green.They just don't get absorbed. :P and don't mess with DNA either.
Btw, do you happen to have any of those c-mount diodes for sale by any chance?
Switch is offline   Reply With Quote
Old 06-14-2008, 12:23 PM #6
GooeyGus's Avatar
Class 3B Laser
 
Join Date: Mar 2008
Posts: 2,673
Rep Power: 970
GooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond repute
Send a message via AIM to GooeyGus Send a message via MSN to GooeyGus
GooeyGus GooeyGus is offline
Class 3B Laser
GooeyGus's Avatar
 
Join Date: Mar 2008
Posts: 2,673
Rep Power: 970
GooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond repute
Send a message via AIM to GooeyGus Send a message via MSN to GooeyGus
Default Re: Sensitivity threshold of various laser wavelen

check out snoctony's auctions on ebay. I think you can get a 2W 808nm for around $100 8-)
GooeyGus is offline   Reply With Quote
Old 06-14-2008, 04:51 PM #7
Switch's Avatar
Class 3B Laser
 
Join Date: Dec 2007
Posts: 3,327
Rep Power: 166
Switch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond repute
Switch Switch is offline
Class 3B Laser
Switch's Avatar
 
Join Date: Dec 2007
Posts: 3,327
Rep Power: 166
Switch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond repute
Default Re: Sensitivity threshold of various laser wavelen

Quote:
Originally Posted by GooeyGus
check out snoctony's auctions on ebay. I think you can get a 2W 808nm for around $100 *8-)
Oh yea I know, they're the ones I was going for.I just thought that maybe you have a used one that you don't need anymore and willing to sell it even cheaper.I'm a cheap @ss
Switch is offline   Reply With Quote
Old 06-14-2008, 05:29 PM #8
Class 3R Laser
 
Join Date: Oct 2006
Posts: 2,032
Rep Power: 31
pseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud of
pseudonomen137 pseudonomen137 is offline
Class 3R Laser
 
Join Date: Oct 2006
Posts: 2,032
Rep Power: 31
pseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud of
Default Re: Sensitivity threshold of various laser wavelen

Relatively light skin here. Red and NIR wavelengths rarely have any effect other than burning up some hair. I've had 10Watts of 808nm on my skin and not felt more than a mild heat. Stuck my arm in the focus of a 1.2W 808nm module yesterday though, and I could feel that about as well as a normal 80-100mW greenie.
pseudonomen137 is offline   Reply With Quote
Old 06-14-2008, 05:54 PM #9
Switch's Avatar
Class 3B Laser
 
Join Date: Dec 2007
Posts: 3,327
Rep Power: 166
Switch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond repute
Switch Switch is offline
Class 3B Laser
Switch's Avatar
 
Join Date: Dec 2007
Posts: 3,327
Rep Power: 166
Switch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond repute
Default Re: Sensitivity threshold of various laser wavelen

It's just funny how if you get a slight tan you're far more sensitive. :P
Switch is offline   Reply With Quote
Old 06-15-2008, 04:32 AM #10
styropyro's Avatar
Class 4 Laser
 
Join Date: Jun 2007
Location: Carbondale, IL
Posts: 5,259
Rep Power: 2895
styropyro has a reputation beyond reputestyropyro has a reputation beyond reputestyropyro has a reputation beyond reputestyropyro has a reputation beyond reputestyropyro has a reputation beyond reputestyropyro has a reputation beyond reputestyropyro has a reputation beyond reputestyropyro has a reputation beyond reputestyropyro has a reputation beyond reputestyropyro has a reputation beyond reputestyropyro has a reputation beyond repute
styropyro styropyro is offline
Class 4 Laser
styropyro's Avatar
 
Join Date: Jun 2007
Location: Carbondale, IL
Posts: 5,259
Rep Power: 2895
styropyro has a reputation beyond reputestyropyro has a reputation beyond reputestyropyro has a reputation beyond reputestyropyro has a reputation beyond reputestyropyro has a reputation beyond reputestyropyro has a reputation beyond reputestyropyro has a reputation beyond reputestyropyro has a reputation beyond reputestyropyro has a reputation beyond reputestyropyro has a reputation beyond reputestyropyro has a reputation beyond repute
Default Re: Sensitivity threshold of various laser wavelen

My DX200 Red has always been able to burn my skin, I think skin tone is the real factor here. I'm not very tan either, but now that it is summer here and I'm outside a lot, my ~150mW red labby scorches my skin. In winter it would sting my skin, but not as easy as it does now. I'm guessing why I get burned easier is maybe because I have some Arabic in me, so it might give me that little extra bit of tan in winter to keep my skin laser-burnable. I'm not sure about that cause I do get pretty pasty without those yummy damaging UV rays. :
__________________

Always protect your seeing balls!
styropyro is offline   Reply With Quote
Old 06-15-2008, 06:54 PM #11
Schrecken_Licht's Avatar
Class 2M Laser
 
Join Date: Feb 2008
Location: Maryland, USA
Posts: 573
Rep Power: 33
Schrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond repute
Schrecken_Licht Schrecken_Licht is offline
Class 2M Laser
Schrecken_Licht's Avatar
 
Join Date: Feb 2008
Location: Maryland, USA
Posts: 573
Rep Power: 33
Schrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond repute
Default Re: Sensitivity threshold of various laser wavelen

It must have a lot to do with skin tone and maybe other things....I've "hammered" my finger tips with the focused beam of my 173mw 660nm pointer and felt nothing....not even warmth. I've got a bit of a tan, at least in summer, but I've never felt the beam on the top of my hand or anywhere darker.
__________________
Ultimate Laser Destruction! http://www.youtube.com/watch?v=wEaB7rwnyZc
The Beast: http://www.youtube.com/watch?v=0xl4c1B5Kao
Schrecken_Licht 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 08:26 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