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Old 05-07-2016, 10:03 PM #1
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Default Problem with diode size.

Hello again, im forced to ask your help again. I bought TO-38 laser diode(3,8mm diameter), but i didnt notice that somehow, i even dont know how i missed so important thing. I have TO-18(5,6mm) holder for diode and lens. My question is can i fit that diode into that holder? I thought can i just place it in there and fill it up with thermal glue somehow, it seems pretty hard but thats one chance. Any ideas? Thanks in advance.


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Old 05-07-2016, 10:13 PM #2
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Default Re: Problem with diode size.

I would no advise trying something like that. You would be best to get a 3.8mm module for the diode.
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Old 05-08-2016, 01:17 AM #3
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Default Re: Problem with diode size.

Quote:
Originally Posted by Tamm View Post
Hello again, im forced to ask your help again. I bought TO-38 laser diode(3,8mm diameter), but i didnt notice that somehow, i even dont know how i missed so important thing. I have TO-18(5,6mm) holder for diode and lens. My question is can i fit that diode into that holder? I thought can i just place it in there and fill it up with thermal glue somehow, it seems pretty hard but thats one chance. Any ideas? Thanks in advance.
Buy a Thin Copper/Aluminium foil, cutting the high 5/6 from the Diode wrap it tight to the diode as you can, make this so thick that you can press in...voila !

Thermal Glue is not a way, this glued two parts, is a relatively bad conductor and is normally very thin between two Tile's.
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Old 05-08-2016, 01:49 AM #4
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Default Re: Problem with diode size.

I'm with DTR on this one. The cost of the correct module is a fraction of the cost of most laser diodes. Any trial and error fiddling with a TO-18 module to try to get good thermal dynamics using the TO-38 laser diode would most likely leave you with an off center diode and terrible thermodynamics.
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Old 05-08-2016, 02:40 AM #5
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Default Re: Problem with diode size.

Hi,
You will need a diode press kit from Flaming pyro here on the forum. what it's purpose is to press the diode into a copper module for a 3.8mm diode. it's fairly easy if you take your time doing it. here are some pics to show what it looks like..

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Attached Thumbnails
Problem with diode size.-img_1738.jpg   Problem with diode size.-img_1739.jpg   Problem with diode size.-img_1740.jpg   Problem with diode size.-img_1664.jpg   Problem with diode size.-img_1534.jpg  

Problem with diode size.-img_1206.jpg   Problem with diode size.-img_1373.jpg  

Last edited by Lifetime17; 05-08-2016 at 02:42 AM.
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Old 05-08-2016, 04:12 AM #6
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Default Re: Problem with diode size.

The press is a given, but he will still need a TO-38 module to press it into. There is no good way to use a TO-18 module for this diode.
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520nm LaserLands pointer Measures 510nm
532nm LSR532H-1W Laser, LSR-PS-N1 Driver, RS-75-5 P.S. 1300 mW
532nm 200mW Thermostatically Controlled Fan Cooled (Besram) >230mW
532nm 189mW pocket lab laser
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Old 05-09-2016, 01:49 PM #7
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Default Re: Problem with diode size.

Agreed. Get the 3.8 copper module. I've done some odd builds but I've yet to use anything but a copper module or large aluminum sink with the correct female press in size.
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