LOC temperature shock test

[Leodahsan]

A diode that normally heats should not be put on a very small temperature, it will get damaged.
just tested this, leaved the diode heating (on) without heatsink. it got ~55ºc (celsius), then put it on freezer's ice. when it got ~10ºc it was outputting ~1mw.

this is not a mistake, this is info posted for people take care when "freezing" their lasers to see something like mode-hopping or inneficient Nd:YaG crystals. don't do it!

 

[Bionic-Badger]

But did it return to normal conditions once it thawed out?

 

[Meatball]

Interesting experiment... do you have any detail about how much time passed?

 

[goninanbl00d]

Remember, the parts in the diode expand with heat.

Gradually allowing it to cool allows the parts to contract slowly back to their original sizes.

By suddenly cooling it, you're causing the parts to suddenly contract, much faster than they would if you let them cool normally. This places stress on the components, including within the laser diode's die.

Thermal stress is one of the biggest causes of COD/ diodes going open circuit. Cooling should never be sudden.

 

[Leodahsan]

sorry for the delay.
Bionic-Badger: it actually didn't got frozen, and no.

Meatball: @3.6v direct drive (CR123A from DX > Ultrafire): ~50 sec.
Freezer: @~-5 ºc: ~5 sec.

goninanbl00d: yeah, but I already done it before and was looking for the limit. THE LIMIT.

all: actually, the limit is when the diode is too hot, that it is nearly 'untouchable' (don't know skin limits ), then you try to freeze it. it is a horrible idea, and maybe I think this experiment would inspire some TEC users to something (maybe not turn on their TECs after the laser was hot, really don't know).

Will be glad to help~