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Old 12-06-2011, 01:48 AM #1
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Default Extreme weather conditions

What are your experiences with portable diode lasers left for a few hours in bad conditions, such as temperatures below 0C and in hot cars over 55C?

What happened to the laser diode, and what happened to the battery? Any worst case scenarios? I need to know what to expect.

I saw a nice, rugged 50 mW laser (one of those DX used to sell) left our for a few hours below zero. The beam became quite dim, I'd say way more than 5 times weaker, but I have no idea what happened in the following days as it wasn't my laser.
When I'm skygazing during the cold nights, I always keep the laser inside my sleeve. Never had any problems.


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Old 12-06-2011, 03:39 AM #2
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Default Re: Extreme weather conditions

If the laser is a dpss unit, the cold will make the output less, due to the module not being able to heat up and stabilize.

As far as diode lasers; in my experience, the colder the laser is, the higher the output.
I have seen a 445nm handheld put out significantly higher power when left in the freezer for a few minutes before metering.

In regards to heat, I try to keep my lasers cool at all times, if possible.
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Would you like to purchase some M-140 445nm diodes (individual or pressed into Aixiz or pure copper module) at very reasonable prices? PM me if you are interested!

My laser list has become way too big; I'm listing some of my favorites out of my extensive collection.
615mw 405nm/12X Spiderfire X-03
148mw 405nm/GGW in my "Hotlight-Saber" host
1920mw 445nm River Rock custom
1530mw 445nm Yobresal
1360mw 445nm Qumefox Sipik
800mw 445nm WL Arctic Spyder S3
240mw 473nm CNI Labby
8mw 473nm CNI Labby
528mw 532nm Lazerer Cannon
310mw 532nm Firedragon III
300mw 532nm CNI Labby
180mw 532nm SKY Laser
4x 147-267mw 532nm Waterproof
900mw 635nm in Temporary Finned Labby Sink
Several 635nm diodes awaiting a build
500mw 650nm Dual LPC-826 Labby
251mw 650nm/LPC-815 Ultrafire U-501B
Several 685nm diodes awaiting a build
3W 808nm diode awaiting build

Kenometer w/ Coherent Thermopile 10W
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Radiant Alpha 2W LPMSOLD=Now in Kuwait!
1.2W RGB Projector; JNM Wide Sky Galvos (Made in Germany); Laser Show Express; Arduino-based DAC
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Old 12-06-2011, 06:47 PM #3
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Default Re: Extreme weather conditions

Quote:
Originally Posted by rocket689 View Post

As far as diode lasers; in my experience, the colder the laser is, the higher the output.
I have seen a 445nm handheld put out significantly higher power when left in the freezer for a few minutes before metering.

In regards to heat, I try to keep my lasers cool at all times, if possible.
So Finnish winter climate (0...-20C..) is great for my 1.2A 445nm build? (when outside)


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Old 12-07-2011, 03:24 AM #4
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Default Re: Extreme weather conditions

Quote:
Originally Posted by TuhOz View Post
So you say Finnish winter climate (0...-20C..) is great for my 1.2A 445nm build? (when outside)

+1 For information!
I supppose your weather would be ideal. lol

One downside is that extreme temperature fluctuations can cause condensation on the inside and outside of the laser, though.
__________________
Would you like to purchase some M-140 445nm diodes (individual or pressed into Aixiz or pure copper module) at very reasonable prices? PM me if you are interested!

My laser list has become way too big; I'm listing some of my favorites out of my extensive collection.
615mw 405nm/12X Spiderfire X-03
148mw 405nm/GGW in my "Hotlight-Saber" host
1920mw 445nm River Rock custom
1530mw 445nm Yobresal
1360mw 445nm Qumefox Sipik
800mw 445nm WL Arctic Spyder S3
240mw 473nm CNI Labby
8mw 473nm CNI Labby
528mw 532nm Lazerer Cannon
310mw 532nm Firedragon III
300mw 532nm CNI Labby
180mw 532nm SKY Laser
4x 147-267mw 532nm Waterproof
900mw 635nm in Temporary Finned Labby Sink
Several 635nm diodes awaiting a build
500mw 650nm Dual LPC-826 Labby
251mw 650nm/LPC-815 Ultrafire U-501B
Several 685nm diodes awaiting a build
3W 808nm diode awaiting build

Kenometer w/ Coherent Thermopile 10W
LaserBee 2.5W USB LPM
Radiant Alpha 2W LPMSOLD=Now in Kuwait!
1.2W RGB Projector; JNM Wide Sky Galvos (Made in Germany); Laser Show Express; Arduino-based DAC
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Old 12-07-2011, 01:41 PM #5
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Default Re: Extreme weather conditions

That's why sensitive electronic equipment should be wrapped in a plastic bag, acclimatized and then removed from the bag. I do it whenever I'm bringing something in a heated room.
People with glasses should know.

There is one problem, though. The battery. It shouldn't be kept so cool because irreversible damage should occur, apparent or not.
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