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 Laser Pointers Anyone here used a compander for R,G,B laser diodes combining all or even for one?

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01-18-2015, 06:15 AM #1
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Anyone here used a compander for R,G,B laser diodes combining all or even for one?

Has anyone here used a compander for R,G,B laser diodes combining all colors or even for one wavelength? I found an old thread where the OP posted the following images:

I found these images using google image search as the original full sized photo's in the thread no longer exist, hoping to find someone who has built one.

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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

RHD's Calc: http://lsrtools.1apps.com/RelativeBr...&useRaleigh=on

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

Last edited by Alaskan; 01-18-2015 at 06:30 AM. Reason: added 2nd photo

01-18-2015, 12:41 PM #2
 Class 4 Laser Join Date: Oct 2007 Location: Oregon, USA Posts: 5,478 Rep Power: 18104
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Location: Oregon, USA
Posts: 5,478
Rep Power: 18104
Re: Anyone here used a compander for R,G,B laser diodes combining all or even for one

That's pretty much what the knife-edging technique is doing. Getting those beams to line up nicely takes effort and additional optics to align, and that effort is better spent if you want to combine multiple lasers of the same wavelength because of the limitations in how such same-wavelength lasers can be combined (e.g. with a polarized beam splitter).
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01-18-2015, 02:49 PM #3
 Super Moderator Join Date: Jan 2014 Location: Great White Frozen North Posts: 9,204 Rep Power: 1081900
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Re: Anyone here used a compander for R,G,B laser diodes combining all or even for one

More light shed on the subject, thank you. I was hoping to make a laser pointer I could combine the ratio of wavelengths in different proportion to make different colors. Combine and then expand to reduce the divergence. Although, I am not so sure expanding after combining together isn't just two steps back and useless.

Edit: thinking upon this more today, then the thing to do would be to combine all of the R, G and B's separately, once I have the combined outputs for each color maybe I could find a way to combine them to make one of seven colors, depending upon the mix. I've been looking at Fresnel lenses as a possible way to do this for the output lens. The reason I have an interest in them, even with their distortions, is they are light weight for the larger diameters, far more so than a glass lens as well as have less loss. I have a 12 inch diameter glass lens I was thinking of using for the output lens, as a huge expander output, but it's very heavy.

__________________

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

RHD's Calc: http://lsrtools.1apps.com/RelativeBr...&useRaleigh=on

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

Last edited by Alaskan; 01-19-2015 at 04:58 PM.

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