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Old 09-25-2010, 06:12 PM #1
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Default PBS Cube to Combine Beams? [VIDEO]

Hello, I am in the process of making a RGB scanner and I was told I should use 2 red laser diodes to compensate for the lack of human vision in the red spectrum. I am using two 250mw long open can LPC-815 red diodes which I have mounted in ModWerx heatsinks.

I purchased a 15mm "Precision Beam Splitter Cube" from the following website:
Optotronics Product Details

After testing, I think I may have gotten the wrong type of optic! Before purchasing, I contacted Optotronics and they said that even though it is not a true PBS cube (not polarized) it would still work for my application. I would think that on one side of the cube, light would pass straight through. While on the perpendicular side, light would be reflected off at a 45 degree angle to combine with the first beam of light. This would allow me to point 2 beams perpendicular from each other and combine them into one (much stronger) beam.

Please have a look at this video I uploaded to YouTube, am I doing something wrong?
YouTube - Optotronics PBS Cube (maybe I have to offset the beam?)

I think this may be the item I should have purchased, it IS polarized and they have different types for each color of laser:
CTlasers.com - Polarizing Beam Cubes
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PBS Cube to Combine Beams? [VIDEO]-dsci1208.jpg  


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Old 09-25-2010, 08:24 PM #2
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Default Re: PBS Cube to Combine Beams? [VIDEO]

It looks like unpolarized beam splitter.
To combine two beams with same wavelength you need polarized beam splitter/combiner.
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Old 09-27-2010, 03:46 PM #3
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Default Re: PBS Cube to Combine Beams? [VIDEO]

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Old 09-27-2010, 08:09 PM #4
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Default Re: PBS Cube to Combine Beams? [VIDEO]

If CTlasers.com's PBS has options for different colors/wavlengths, why don't they say the PBS is AR coated? I would ask before buying & even ask what color each of their different coatings appear to be. (see if it matches what they Should be) I'm probably just being suspicious.
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Old 09-27-2010, 09:28 PM #5
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Default Re: PBS Cube to Combine Beams? [VIDEO]

FYI, they most definitely are AR coated. CT Lasers sells the LaserWave PBS's.



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