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Combining lasers for different colors?

HIMNL9

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Are you sure it's PCBS? When I was playing with this element it looked rather like a dichroic cube beamsplitter. BTW here's a picture of the PHR pickup with description of the elements: http://repairfaq.cis.upenn.edu/Misc/phr803ta.jpg This is what I fugured out about that optics, if there's something wrong please let me know.
No, it's polarized, i'm sure ..... but if you've made your tests with a green module, you can't see it, cause the green beam is only lightly polarized ..... you need to test it with a red or better a BR, for see the polarization effect.

If you can, do this test with a BR, and you will see what i mean ..... take the cube and a BR in an aixiz or other module and get a straight beam from the module, then shine the beam through the face that is normally used as BR input, and look the opposite face (the sanded one) ..... now, slowly rotate the module ..... you will see that in one position, there's the maximum reflection (almost all the beam come out from the left face at 90 degrees, and almost no light is transferred to the sanded face), and continuing to rotate the module, you will see that the spot on the sanded face increase it's intensity, while the light transferred to the output face decrease ..... this means that the cube is a PBS, otherwise, for common beam splitters, there's no variations in the intensities rotating the module.
 

c4r0

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if you've made your tests with a green module, you can't see it, cause the green beam is only lightly polarized
It depends on the module. However, as far as I know, every laser with SHG should produce fully (almost fully) linearly polarized beam because it has to be phase matched, so doubled freq. wave appears only at one particular linear polarization. Anyway, I have seen some >99% polarized green DPSS lasers but haven't seen any non-polarized.

When checking anything related with polarization I usually use white polarized light. Then I can at once see if the element has polarizing properties for some particular color or it's broadband. I'll check that BS with a BluRay diode as you sugested, hopefully within this week.
 
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HIMNL9

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Sorry, i realized that with some pics it was more clear, that what i meant, so i took them ..... (sorry for the "improvised" workbench, but i don't have an optical workbench at shop, so i have to improvisate mounts when i need to take pics ..... also, the pics are dark, but there's nothing to do with this, also at 20mW, the light saturate the webcam if i keep the level more high ..... anyway it's enough for see what i mean.

If i shine the beam with the polarization parallel to the plane, it become approximatively 95% reflected, and only few light go through the cube to the sanded face:



Turning the polarization plane of the light at 45 degrees, almost half go through and half become reflected :



Turning it at 90 degrees, almost 95% of the light go through to the sanded face, and very few become reflected:



Ofcourse, no 100% results are achieved, but these cubes are not perfect optical elements, so is normal that there's a light percentage that go around or dispersed (at eyes, the difference is much better seen) ..... but i think it's enough for show what i was meaning, more clearly than with my bad english, anyway ;) .....
 

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HIMNL9

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I understood what you meant from your previous post.
Then i'm wondering why you call it bullshit ..... :p

..... I'll check that BS with a BluRay diode as you sugested, hopefully within this week.


Edit: i just tought ..... maybe you don't know that in English based forums, "BS" is normally used as shortening for "bullshit" .....
 

c4r0

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Edit: i just tought ..... maybe you don't know that in English based forums, "BS" is normally used as shortening for "bullshit" .....
I didn't know that indeed :p Sorry. But I know that in English texts about lasers BS = beamsplitter.
 

Rafa

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Ok thats exactly what i were wanting to do (the post you linked).
I will use 2 diodes, 2 aixiz modules and the cube in the sled.
Thanks
 
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If you pay shipping, I'm willing to lend you a dichro to combine BR and RED. I won it on a competition on this forum and I've not used it since I got it. This way you will see if you want to stay with the pcb cube or buy a dichro instead :)

I was told it was 45$, it's a high quality one :D

PD: Letter from Tarragona to Madrid and Back will cost you 3 or 4 euros at most.
 




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