Old 11-19-2008, 06:56 AM #17
Class 3R Laser
 
Join Date: Jun 2007
Posts: 1,759
Rep Power: 181117
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: 1,759
Rep Power: 181117
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: IR laser deflourescenating?

Read this http://www.repairfaq.org/sam/laserioi.htm#ioildls
Go to alt.lasers and ask also
http://groups.google.com/group/alt.l...schg&hl=en


steve001 is offline   Reply With Quote


















Old 11-19-2008, 06:59 AM #18
pullbangdead's Avatar
Class 3R Laser
 
Join Date: Aug 2007
Posts: 2,045
Rep Power: 788
pullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond repute
pullbangdead pullbangdead is offline
Class 3R Laser
pullbangdead's Avatar
 
Join Date: Aug 2007
Posts: 2,045
Rep Power: 788
pullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond repute
Default Re: IR laser deflourescenating?

Any shorter wavelength of light will charge something the phosphoresces (ie glows in the dark). Violet will charge all other visible colors, green will charge yellow and up in wavelength, red would only charge up darker shades of red. The wavelength of the light doing the charging must be shorter than the wavelength of light emitted by the fluorescing/phosphorescing object (shorter wavelength is higher energy).

The "de-phosphorescing" being talked about here is what Benm is talking about. Sometimes lower energy light can provide the activation energy necessary for a non-radiative pathway. If left alone, the electrons that are at higher energy will sit there for a while and eventually fall back down to ground radiatively (emitting a photon). But there are other ways for electrons to give up their energy, such as non-radiative recombination. The IR or red light isn't high enough energy to cause electrons to excite up to the high-energy state, but it can provide the activation energy for high-energy electrons to transition back down in energy must faster than they otherwise would have through non-radiative processes.
pullbangdead is offline   Reply With Quote
Old 11-19-2008, 12:01 PM #19
Benm's Avatar
Class 4 Laser
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,623
Rep Power: 210024
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Benm Benm is offline
Class 4 Laser
Benm's Avatar
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,623
Rep Power: 210024
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Default Re: IR laser deflourescenating?

And that is probably why IR lasers only work sometimes. There has to be an energy level the electrons can go to with the energy provided by the IR light. If no such level exists or the transition is forbidden, it's not likely to work.

With the usual greenish-glow-in-the-dark materials, red lasers seem very effective in removing electrons from the forbidden-locked charged state.

One interesting application that uses the reverse effect are IR indicator cards that are pre-charged: IR light pushes the electrons further, allowing a radiating transition at visible energy levels, resulting in a spot of light wherever IR light hits the card.
Benm is offline   Reply With Quote
Old 11-20-2008, 02:55 AM #20
randomlugia's Avatar
Class 3R Laser
 
Join Date: Sep 2008
Location: Williamsport, MD
Posts: 1,808
Rep Power: 112
randomlugia has a reputation beyond reputerandomlugia has a reputation beyond reputerandomlugia has a reputation beyond reputerandomlugia has a reputation beyond reputerandomlugia has a reputation beyond reputerandomlugia has a reputation beyond reputerandomlugia has a reputation beyond reputerandomlugia has a reputation beyond reputerandomlugia has a reputation beyond reputerandomlugia has a reputation beyond reputerandomlugia has a reputation beyond repute
randomlugia randomlugia is offline
Class 3R Laser
randomlugia's Avatar
 
Join Date: Sep 2008
Location: Williamsport, MD
Posts: 1,808
Rep Power: 112
randomlugia has a reputation beyond reputerandomlugia has a reputation beyond reputerandomlugia has a reputation beyond reputerandomlugia has a reputation beyond reputerandomlugia has a reputation beyond reputerandomlugia has a reputation beyond reputerandomlugia has a reputation beyond reputerandomlugia has a reputation beyond reputerandomlugia has a reputation beyond reputerandomlugia has a reputation beyond reputerandomlugia has a reputation beyond repute
Default Re: IR laser deflourescenating?

That's probably also why it gets a lot brighter, and then darker. It just speeds up the glowing process... It sounds like it doesn't work with many glow in the dark things. Mabye I could sell this star for hundreds on Ebay!
__________________
Laser Addict---Audiophile---Knife Nut
randomlugia is offline   Reply With Quote
Old 11-20-2008, 11:12 AM #21
Class 1M Laser
 
Join Date: Sep 2008
Posts: 182
Rep Power: 10
kernelpanic is on a distinguished road
kernelpanic kernelpanic is offline
Class 1M Laser
 
Join Date: Sep 2008
Posts: 182
Rep Power: 10
kernelpanic is on a distinguished road
Default Re: IR laser deflourescenating?

Hello All,

I also have noticed this with some glow-in-the-dark stars I've got. The effect is quite remarkable. (enough that I can 'negatively' write on them with my long open-can...) The red light instantly drains the material!

cheers,
kernelpanic
kernelpanic is offline   Reply With Quote
Old 11-22-2008, 01:22 AM #22
randomlugia's Avatar
Class 3R Laser
 
Join Date: Sep 2008
Location: Williamsport, MD
Posts: 1,808
Rep Power: 112
randomlugia has a reputation beyond reputerandomlugia has a reputation beyond reputerandomlugia has a reputation beyond reputerandomlugia has a reputation beyond reputerandomlugia has a reputation beyond reputerandomlugia has a reputation beyond reputerandomlugia has a reputation beyond reputerandomlugia has a reputation beyond reputerandomlugia has a reputation beyond reputerandomlugia has a reputation beyond reputerandomlugia has a reputation beyond repute
randomlugia randomlugia is offline
Class 3R Laser
randomlugia's Avatar
 
Join Date: Sep 2008
Location: Williamsport, MD
Posts: 1,808
Rep Power: 112
randomlugia has a reputation beyond reputerandomlugia has a reputation beyond reputerandomlugia has a reputation beyond reputerandomlugia has a reputation beyond reputerandomlugia has a reputation beyond reputerandomlugia has a reputation beyond reputerandomlugia has a reputation beyond reputerandomlugia has a reputation beyond reputerandomlugia has a reputation beyond reputerandomlugia has a reputation beyond reputerandomlugia has a reputation beyond repute
Default Re: IR laser deflourescenating?

I was wrong, the red also discharges. I was fooled when it lit up really bright, right before it went down. The red was so bright I couldn't see anything. :P
__________________
Laser Addict---Audiophile---Knife Nut
randomlugia 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

























Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 02:07 AM.


Powered by: vBulletin
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
Privacy Policy | Advertising Disclaimer | Terms of Use
Copyright (C) 2017 Laser Pointer Forums, LLC