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





Welcome to Laser Pointer Forums! If you are looking for a laser pointer or want to compare different laser pointer companies, you may want to check out the LPF Laser Pointer Company Database. The link will open in a new window for your convenience.








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
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
Laser Technology Laser Pointer Parts Lasers by Wavelength
Top 10 Laser Pointer Companies Laser Pointer Company Database Visible Beam Laser Pointers


One laser store meets all your needs

























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



LPF List of Laser Pointer Companies (link opens new window)



Reply
 
LinkBack Thread Tools Display Modes
Old 08-30-2009, 01:30 PM #17
HIMNL9's Avatar
Class 4 Laser
 
Join Date: May 2009
Location: Lost somewhere in the EU mess ;)
Posts: 5,416
Rep Power: 404
HIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond repute
HIMNL9 HIMNL9 is offline
Class 4 Laser
HIMNL9's Avatar
 
Join Date: May 2009
Location: Lost somewhere in the EU mess ;)
Posts: 5,416
Rep Power: 404
HIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond repute
Default Re: Diode lives AND lases at -100F?

Just some considerations (so you can hate me j/k )

First, closed cans can become damaged as the others, cause the extreme low temperatures can detach or shatter the window (more than other the temperature change, but you have also to considerate that the expansion / contraption rate of the can (metal) is usually not the same of the window, and the mechanical stress can cause detach of the glue or damage of the glass.

Same consideration, also if for a different thing, can be made about the chip ..... don't think to the soldering material, that have a rate similar to the glass, but about the metallic part where the chip is soldered on ? ..... usually, in the constructive process, is kept in consideration the increase of the temperature, not so much the decreasing of it ..... ok, the wavelenght can change a bit, cause also when the chip contract, the distance between the resonant faces (coating) decrease, but if the decreasing rate of the metal support is too much different of the one of the chip material, there's always the risk of breaking (chips and creeks) ..... especially pumping in the chip a big amount of energy, when it's at very low temperatures, making it expanding more quick than the support (but, maybe, IF it can work fully immersed in the cooling liquid .....)

Also about this ..... as you probably know, reflection characteristics of surfaces changes when you change the medium in which they are immersed (think to glass in air and water differences) ...... in full immersion in a liquid, the dielectric coating that make the resonant cavity, can, maybe, change its reflective properties enough to make the chip just not lasing, or changing it basically ?

Just an idea


__________________
High Impulse Multipath Neutron Laser (mark 9 ) (LOL)
Dare mo mita koto no nai, kaze, kumo, suna, umi ..... Kokoro no hate no doko ka eien ga kagayaku.
HIMNL9 is offline   Reply With Quote







LPF List of Laser Pointer Companies (link opens new window)







Old 08-30-2009, 03:07 PM #18
Benm's Avatar
Class 4 Laser
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,439
Rep Power: 18210
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: 7,439
Rep Power: 18210
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: Diode lives AND lases at -100F?

Lots of unknowns here - the window on a closed can could shatter, filling the diode with solvent and causing problems there. Its an experiment, not something i'd consider using any expensive diode for. You could just use the basic 5 mW in an aixiz, just to see what happens.

The reduction in wavelength is not caused by contraction of the cavity at all, its caused by lower bandgap at lower temperatures for the semiconductor used. Normal diodes exhibit the same effect, their forward voltage (at equal current) drops with increasing temperature (by about 2 mV/K for standard silicon diodes).
Benm is online now   Reply With Quote
Old 08-30-2009, 09:06 PM #19
Class 2M Laser
 
Join Date: Feb 2008
Posts: 733
Rep Power: 83
hydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond repute
hydrogenman15 hydrogenman15 is offline
Class 2M Laser
 
Join Date: Feb 2008
Posts: 733
Rep Power: 83
hydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond repute
Default Re: Diode lives AND lases at -100F?

The diode I used in the original test was the low powered red laser from the phr sled. The window did not crack and after 10-15min nothing significant happened. The diode was uncollaminated and i could not see any visible change in wavelength. It was just one diode though and I haven't tried any higher powered diodes yet. I'll get a lcc diode and try it again. -hydro15
hydrogenman15 is offline   Reply With Quote
Old 08-31-2009, 05:38 AM #20
millirad's Avatar
Class 3B Laser
 
Join Date: Apr 2009
Location: No. California
Posts: 2,576
Rep Power: 297
millirad has a reputation beyond reputemillirad has a reputation beyond reputemillirad has a reputation beyond reputemillirad has a reputation beyond reputemillirad has a reputation beyond reputemillirad has a reputation beyond reputemillirad has a reputation beyond reputemillirad has a reputation beyond reputemillirad has a reputation beyond reputemillirad has a reputation beyond reputemillirad has a reputation beyond repute
millirad millirad is offline
Class 3B Laser
millirad's Avatar
 
Join Date: Apr 2009
Location: No. California
Posts: 2,576
Rep Power: 297
millirad has a reputation beyond reputemillirad has a reputation beyond reputemillirad has a reputation beyond reputemillirad has a reputation beyond reputemillirad has a reputation beyond reputemillirad has a reputation beyond reputemillirad has a reputation beyond reputemillirad has a reputation beyond reputemillirad has a reputation beyond reputemillirad has a reputation beyond reputemillirad has a reputation beyond repute
Default Re: Diode lives AND lases at -100F?

Although it is unlikely the diode could ignite the alcohol and become a fire hazard.
__________________
Greenie - 100mw in diy aluminum host
650nm - 260mw in MXDL host with brass heatsink
650nm - 325mw in stainless Raygun host. The dot is so bright it's
PINK/ORANGE!
Thanks Jay! Thanks Drew! Thanks Larry! Thanks Glenn! Thanks Dave!

Pink - 500mW (white w/red , ok not till later)
Please don't dazzle aircraft! You wouldn't hit someone in the face normally would you?
Home of the stainless RAYGUN !
millirad is offline   Reply With Quote
Old 08-31-2009, 06:44 AM #21
Class 2M Laser
 
Join Date: Feb 2008
Posts: 733
Rep Power: 83
hydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond repute
hydrogenman15 hydrogenman15 is offline
Class 2M Laser
 
Join Date: Feb 2008
Posts: 733
Rep Power: 83
hydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond reputehydrogenman15 has a reputation beyond repute
Default Re: Diode lives AND lases at -100F?

Quote:
Originally Posted by millirad View Post
Although it is unlikely the diode could ignite the alcohol and become a fire hazard.
I have a fire extinguisher 5 feet from where the experiment takes place in the event that something goes wrong. Theres also the possibility that the CO2 will simply extinguish the fire by displacing the oxygen.

--Hydro15
hydrogenman15 is offline   Reply With Quote
Old 08-31-2009, 01:37 PM #22
Benm's Avatar
Class 4 Laser
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,439
Rep Power: 18210
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: 7,439
Rep Power: 18210
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: Diode lives AND lases at -100F?

Once its cooled down, the alcohol (ethanol or isopropanol) will be below its flashpoint, and hardly any vapours. You would not be able to ignite it with a lighter if you wanted to.

Obviously this only goes for the CO2 cooled alcohol, and spills evaporating from the table will still pose a risk.

I think most canned diodes should survive being frozen like this. The temperature change is in the order of 100 kelvin, which is comparable in temp change to what happens to the diode when you solder it carelessly.

I'd try it right here if i could get some dry ice... but since i dont work in the lab anymore, its not easy to come by here - unless i want 25 kg of the stuff deliverd. As I understand it is sold in the US in some major supermarkets and welding supply stores etc.
Benm is online now   Reply With Quote
Old 09-01-2009, 01:00 AM #23
pullbangdead's Avatar
Class 3R Laser
 
Join Date: Aug 2007
Posts: 2,045
Rep Power: 238
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: 238
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: Diode lives AND lases at -100F?

^Yep, many supermarkets sell dry ice here in the US. I can get good sized blocks right down the street at Ralph's.

Although it was always nicer working in a lab when we were using dry ice a lot, because the form we got it in was narrow rods that were 1-2 inches long and exactly the right width to go into the opening of a Coke bottle. Very convenient, a lot of fun, and we never went through all of it in the lab (we could only get it in 50lb quantities), so we had plenty to play with after work every day.
pullbangdead is offline   Reply With Quote
Old 09-01-2009, 07:22 AM #24
HIMNL9's Avatar
Class 4 Laser
 
Join Date: May 2009
Location: Lost somewhere in the EU mess ;)
Posts: 5,416
Rep Power: 404
HIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond repute
HIMNL9 HIMNL9 is offline
Class 4 Laser
HIMNL9's Avatar
 
Join Date: May 2009
Location: Lost somewhere in the EU mess ;)
Posts: 5,416
Rep Power: 404
HIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond repute
Default Re: Diode lives AND lases at -100F?

Quote:
Originally Posted by pullbangdead View Post
^Yep, many supermarkets sell dry ice here in the US.
Hell, now i have a new thing to be envious ..... here, only as lab or industry, or show market, you can buy dry ice ..... and for sure, not in a supermarket, only in specialized resellers, and ofcourse, at high price
__________________
High Impulse Multipath Neutron Laser (mark 9 ) (LOL)
Dare mo mita koto no nai, kaze, kumo, suna, umi ..... Kokoro no hate no doko ka eien ga kagayaku.
HIMNL9 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








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
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 10:26 AM.


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