LPF Laser Pointer Company Database






Welcome to Laser Pointer Forums! If you are looking for a laser you may want to check out the database of laser pointer companies. The link will open in a new window for your convenience.

Green Laser Pointers Blue Lasers Pointers Red Laser Pointers
Yellow Laser Pointers Purple Laser Pointers Orange Laser Pointers
Laser Pointers by Power - 1 Watt+ Laser Pointers by Power - 500mW+ Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes


























Go Back   Laser Pointer Forums - Discuss Laser Pointers > Lasers > General

LPF Database of Laser Pointer Companies




Reply
 
LinkBack Thread Tools Display Modes
Old 09-17-2007, 02:51 AM #1
Class 2 Laser
 
Join Date: May 2007
Posts: 340
Rep Power: 13
Ashton is a jewel in the roughAshton is a jewel in the roughAshton is a jewel in the rough
Ashton Ashton is offline
Class 2 Laser
 
Join Date: May 2007
Posts: 340
Rep Power: 13
Ashton is a jewel in the roughAshton is a jewel in the roughAshton is a jewel in the rough
Default What is mode-hopping - Chrystal or Diode?

I know that when power drops below a certain threshold you experiance mod-hopping, however, I was wondering which causes the mode hopping; the diode or the crystal, and what's acctualyl going on when it's mode hopping? are parts of the crystal/chip the lasing proerly or...?


Ashton is offline   Reply With Quote








Old 09-17-2007, 03:32 AM #2
Class 3R Laser
 
Join Date: Oct 2006
Posts: 2,032
Rep Power: 30
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: 30
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: What is mode-hopping - Chrystal or Diode?

you mean mode changing between TEM modes? That is because of the crystal. Inside the cavity, the profile has to be the same after it makes a complete pass back and forth between the mirrors. The fundamental profile for that behavior is TEM00, but different stresses on the crystal, aperture, etc. can force other TEM modes.

Mode hopping (longitudinal modes as opposed to transverse [TEM=Transverse Electromagnetic Mode]) is with the diode as temperature changes
pseudonomen137 is offline   Reply With Quote
Old 09-17-2007, 07:43 AM #3
SenKat
Guest
 
Posts: n/a
SenKat
Guest
 
Posts: n/a
Default Re: What is mode-hopping - Chrystal or Diode?

Pseudo - exellent explaination. I think some folks have lost sight of exactly how lasers function -

The energy bounces back and forth between two mirrors until it reaches enough energy to go out of it's little home, and lase for all of us to enjoy Kinda like digi-Pong on speed !
  Reply With Quote
Old 09-17-2007, 04:19 PM #4
Class 2 Laser
 
Join Date: May 2007
Posts: 340
Rep Power: 13
Ashton is a jewel in the roughAshton is a jewel in the roughAshton is a jewel in the rough
Ashton Ashton is offline
Class 2 Laser
 
Join Date: May 2007
Posts: 340
Rep Power: 13
Ashton is a jewel in the roughAshton is a jewel in the roughAshton is a jewel in the rough
Default Re: What is mode-hopping - Chrystal or Diode?

lol. I didn't know exactly how it worked, but I knew that little mirrored 'bowl' was vital (somone acctually told me that when a LD burns up you could (in theory, not in application, waaaaaay too expensive to really do) you could go in there and repair the reaction chamber and the LD would work perfectly again!

Thank you, pseudo, that's exactly what I was wanting to know! I appreciate the info, both of you!
Ashton is offline   Reply With Quote
Old 09-17-2007, 08:01 PM #5
Class 2M Laser
 
Join Date: May 2007
Posts: 534
Rep Power: 12
Aseras is on a distinguished road
Aseras Aseras is offline
Class 2M Laser
 
Join Date: May 2007
Posts: 534
Rep Power: 12
Aseras is on a distinguished road
Default Re: What is mode-hopping - Chrystal or Diode?

usually when you "blow" a diode ( in my definiton a blown diode is dead ) you cook the junctions, where the electrical connections are.. you can however also cause catastrophic optical damge, like when you make a LED, and that is because you got the power so high it melted the facet or lense on the diode where the light is emitted.. that's not really fixable either. if you just cook the junction you might be able to resolder the diode and make it work again but i doubt it.

as far as dpss, usually you blow the diodes before the crystal , but if you overdrive a crystal enough, you can cook it too. that starts looking like a line or gray barbar in the crystal. you can also split hybrid crystals or do lots of other things to them. you usually see this kind of thing in stuff that's not sized for the application.
Aseras 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








Top 50 Laser Pointer Companies - Green Lasers Top 50 Laser Pointer Companies - Blue Lasers Top 50 Laser Pointer Companies - Red Lasers
Top 50 Laser Pointer Companies - Yellow Lasers Top 50 Laser Pointer Companies - Purple Lasers Top 50 Laser Pointer Companies - Orange Lasers
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 06:43 AM.


Powered by: vBulletin
Copyright ©2000 - 2016, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
Privacy Policy | Advertising Disclaimer | Terms of Use
Copyright (C) 2016 Laser Pointer Forums, LLC