laser diode cooling and running

[danielbriggs]

Will OD 6+ goggles be ok

Others will be able to explain this better, but OD stand for Optical Density and is a logarithmic scale.
Goggles with an OD of 2 would have a reduction of 10^2 = 100 times. OD6 would be 10^6 = 1,000,000 times attenuation.
So if you looked directly at a 2W beam, 0.002mW in theory will pass through into your eye through OD6 goggles. However goggles do NOT eradicate stupidity.
2W will quite easily make your hands very toasty very quickly should they get in the way etc... *and painful not to mention*

If anyone knows a place to get a cheap TEC driver could they PM me or post a comment on here please because i need one for 2x 138 watt tecs and a 500 watt tec

Assuming they are 12V TEC's then you'll need 2x 11.5A and 42A supply.
Quite a big demand...
I'd go for 2x Decent ATX PC power supplies. Hook 2x 138W up to one (~23A) and the other 500W one to another one capable of supplying a bit more oomph. It states on the side of each PSU what the max current is. If you can't find one that will take 42A on the 12V rail (single, not dual rail) look at adding a high power current limiting resistor to knock it back to a bit below the max. Just do a few calcs to make sure everything is safe, and you should be fine.

Dan

[ionlaser555]

Assuming they are 12V TEC's then you'll need 2x 11.5A and 42A supply.
Quite a big demand...
I'd go for 2x Decent ATX PC power supplies. Hook 2x 138W up to one (~23A) and the other 500W one to another one capable of supplying a bit more oomph. It states on the side of each PSU what the max current is. If you can't find one that will take 42A on the 12V rail (single, not dual rail) look at adding a high power current limiting resistor to knock it back to a bit below the max. Just do a few calcs to make sure everything is safe, and you should be fine.

Dan

Thanks for the help , i have 2 10 watt tecs now for the diode i think 138 watt is a bit powerful or is this still ok .

On the 9mm diodes is it the top part of the diode (silver bit) or the gold bit which is 9mm so i can drill a mount for the diode can i put a very small amount of thermal grease roung the diode to help with heat transfer


thanks.

[danielbriggs]

Thanks for the help , i have 2 10 watt tecs now for the diode i think 138 watt is a bit powerful or is this still ok .

On the 9mm diodes is it the top part of the diode (silver bit) or the gold bit which is 9mm so i can drill a mount for the diode can i put a very small amount of thermal grease roung the diode to help with heat transfer


thanks.

If it's for cooling the diode, I'd say you'll be fine with a single 10W TEC. I'd look at a low power temp. controller with a thermistor to regulate the temp of the TEC and stabilise the diode output slightly...

You certainly DONT need 500W to cool a diode!!!

[ionlaser555]

If it's for cooling the diode, I'd say you'll be fine with a single 10W TEC. I'd look at a low power temp. controller with a thermistor to regulate the temp of the TEC and stabilise the diode output slightly...

You certainly DONT need 500W to cool a diode!!!

Yer the 500 watt tec is 6 cm x 6 cm 32 amps to run just one .

thanks for all the help.

[ionlaser555]

Hi


I got the diodes working im not shure of the output power but the diode draws 2 amp @ 2.5 volts
the setup is tec cooled with the diode in a aluminium mount this is the start to a homemade green

[ionlaser555]

Hi

Here is a link to the video of the diode running and setup.

the diode is now running at 3 volts 2.5 amps.

http://www.youtube.com/watch?v=OSPDX2c9j2M