Old 11-12-2010, 02:00 AM #17
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Default Re: Building an Infrared Laser

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I have a green laser pointer, it's fairly bright and goes pretty far. You can see the beam when there is low light, and could I possibly take it apart, and replace the diode in it with the diode I have?
~lilneo
Inside of that green laser, is an IR diode, that is very carefully focused through a crystal to produce green light.
Also if you mess up that alignment, it will be impossible to re align with expensive power meter.

and as noted above, it needs more to it to have a 300 mw output..



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Old 11-12-2010, 05:24 AM #18
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Default Re: Building an Infrared Laser

Alright thanks for the info.
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Old 06-01-2015, 09:53 PM #19
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Default Re: Building an Infrared Laser

This is interesting to me, to build an infrared laser pointer, and want to see what kind of answer you get. Where do you find the diode you mention?
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Old 06-02-2015, 02:22 AM #20
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Default Re: Building an Infrared Laser

IR is rather boring, I agree and a 300mw IR diode won't burn as quickly as a higher power visible light blue or violet diode can which although both dangerous, especially the 405nm violet diodes, at least you can see it better than IR. I probably shouldn't even mention the 405 because that's another problem, although a great burner, it appears dim when it really has a lot of power, our vision is only 1 percent as sensitive to 405nm violet as 532nm green, so its brightness is misleading but man, that is one hell of a burner, much quicker than any of the 300mw IR diodes I have because it can be focused into an incredibly small dot where IR doesn't focus so tightly.

That said and I don't recommend playing around with IR as a newbie, once you have built a visible spectrum laser to understand them better, a quick way to get a IR burner is to convert a cheap 532nm laser pointer. I bought a 8 dollar one from China on ebay and just removed the KTP crystal assembly from the diode by popping it off with a screw driver, then I had to put a G2 type of lens in the other end of the lens barrel where it was within 8mm of the laser diode to focus it, but it worked and puts out 300mw and will burn too, but not nearly as fast or as intense as my 800mw 405nm laser pointer which I won't even use very often I consider it so dangerous, I'm afraid of an accident.
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Attention new brothers of the collimated light!

Newbie advice: Please take the time to first make an introduction in the Welcome section before posting questions.


Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be very roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

YAG Power Calc. Laser Peak Power Calculator - Ophir

Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

Compare different colors: http://lsrtools.1apps.com/RelativeBr...&useRaleigh=on

High Current Pulse Drivers: https://tinyurl.com/ya7whuk3

Last edited by Alaskan; 06-02-2015 at 03:19 AM.
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