Cryogenic diodes

[ledfreak3d]

What are your thoughts ledfreak3d? Im unsure about the whole thing to, so you now what a cold-finger is?

wel all i know its realy hard to keep condensation away from the diode.
especialy at those temps
no mather wat u do the die or window wil freeze
there is no way to keep the die / window warm since this wil also cause condensation

[Pianoman]

Just submerge the whole thing in LN2 (liquid nitrogen) which costs as much as regular milk. If it's completely submerged, no condensation can get to it but it has to stay submerged. Insulating the container your storing it in would slow the LN2 evaporation rate greatly making it last longer ( I recommend buying LN2 from AirGas they charge me $1.50 per liter). This would be a good solution if it can withstand temps. at -321 degree Fahrenheit. If you do decide to use dry ice, attach a dehumidifier to the container it's stored in and as long as it's sucking out any water vapor, no ice can form!

[jnrpop]

Just now need to find a glass vile, put a cold finger setup in it, seal it with the cold finger sticking out, get a slight vaccume then fill it with Liquid nitrogen, have the end of the cold finger put in dryice and have a thermo attached....easy..

[FourDee]

What's the purpose of your setup?

[jnrpop]

"FourDee"
Well i got some diodes, there 500mw-1W Pulsed or CW red/orange diodes. They run CW at -20C at around 635nm and run 618nm pulsed at -20C, they can run pulsed at room temp and get 635nm at around 500mw. SO im trying to get a setup that will allow me to get as close to 618nm but i would like it to run CW. Ive got 4 diodes so my first setup is going to be with a TEC and heatsink with fan, and im going to run it pulsed at 600ma. And experiment with how cold i can get the temp!

[FourDee]

I was just wondering what the setup (considering you get it up and running) ultimately would be used for

[jnrpop]

Well its just a hobby for atm, but eventualy it might be incorporated into somethink else, a dye maybe!