Laser pointer discussion. Read/write reviews of laser pointers and laser pointer companies. Learn about all types of laser pointers and lasers





One laser store meets all your needs

Go Back   Laser Pointer Forums - Discuss Laser Pointers > Lasers > Experiments & Modifications





Reply
 
LinkBack Thread Tools Display Modes
Old 10-31-2015, 01:49 AM #49
Benm's Avatar
Class 4 Laser
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,495
Rep Power: 29264
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 online now
Class 4 Laser
Benm's Avatar
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,495
Rep Power: 29264
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: Liquid Nitrogen Cooled Oclaro 638nm Laser Diode??

The shift is directly related to the temperature of the semiconductor material. In is an inherit property where the bandgap depens on temperature. How large this variation is depends on the actual semiconductor material, but for a simple silicon diode (like a 1n4148) is it large and reliable enough to use these as course temperature sensors.

As far as current handling: Obviously there is plenty of cooling at cryo temperatures so that's not much of a concern. This still does not mean that you can push power up that far though, as the facets remain sensitive to optical failure. Also you might want to be careful at what rate you increase and decrease currents as i can imagine thermal cracks would become a problem if you ran a diode from zero to full power instantly under cryo conditions.


Benm is online now   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
















Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 09:56 PM.


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