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Reference Guide: How to Combine Lasers

Kizdawg

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Just don't use SF-11 for 445nm, use BK-7. I don't know about brass, I used acrylic to isolate the optics.
Acrylic only thread I saw with that was the laserluke one.. And If I can remember correctly the acrylic had some warpage in the build and he had to re design with screws to adjust the beam.. er optics
 
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hoo7h

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wow very helpful, it finally solved this mysterious subject.

BTW Polarized beam splitters can be used to combine more than 2, correct me if I am wrong, but I think if we put one more module beside the one that we rotated 90, and we put one more half cube in front of the full cube, we will have one beam from the 3 modules.
Not sure, please think about it and give me your opinion.
 

ARG

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wow very helpful, it finally solved this mysterious subject.

BTW Polarized beam splitters can be used to combine more than 2, correct me if I am wrong, but I think if we put one more module beside the one that we rotated 90, and we put one more half cube in front of the full cube, we will have one beam from the 3 modules.
Not sure, please think about it and give me your opinion.
That cannot be done. Only one PBS cube can be used in the process. If you were to do that the output of the first PBS would be split by the second.
 

Bionic-Badger

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The PBS basically superimposes two beams of differing (perpendicular) polarizations in one "beam." It's like having two wavelengths of light in one beam, which looks like a combination of the two--only this is combining with different polarizations.

Adding another polarization-specific reflector (e.g. another PBS) in the path of the combined beam will cause the light of that polarization to be split off (reflected) from the combined beam. That's why the PBS is both a combiner and a splitter depending on how light enters it and that light's polarization.
 

Kizdawg

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Ok Well I am in for all this.. Going to order up some parts.. Should I bother with things like Brass Flex mount There darn expensive but will they help me out alot to justify the price? And I am not even sure exactly how they mount a mirror, filter or cube...
 
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Ok Well I am in for all this.. Going to order up some parts.. Should I bother with things like Brass Flex mount There darn expensive but will they help me out alot to justify the price? And I am not even sure exactly how they mount a mirror, filter or cube...
flex mounts are for very small adjustments. they are primarily used for knife edging. dichros you should use a 3 axis optics mount which adjust with a greater range
 

Kizdawg

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I looked at the 3 axis but there huge 2.5cm to stick in a handheld that wouldnt work I have been thinking.... The 3 aixis were 100cpi the brass ones were 60cpi adjustments.

Sorry I am going to PBS a couple 9mm's 445's together, and I may make a yellow with a dicro.
 
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I looked at the 3 axis but there huge 2.5cm to stick in a handheld that wouldnt work I have been thinking.... The 3 aixis were 100cpi the brass ones were 60cpi adjustments.
oh i did not realize this was going to be put in a handheld. i would wait for args input as i have never used mounts for a handheld
 

Kizdawg

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I see other stuff there but not sure I want to drop 1K yet.. I gota try some stuff out first and see how it goes... I think the new king will have about a 50mm inside diameter but I cant say till tomorrow.. May have to design and source it here.. I have a few designs. I want 9W 445... this year in a handheld..
 
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ARG

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Depends how big your handheld is. Those brass flexmounts help out a TON, but I doubt you can fit them in a handheld. For mirrors you mount them on the 45 degree side with epoxy, and cubes you mount them on the front.
 
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So using dichros how much wavelength difference we talking. I wonder as new diodes come out and there peak is shifted or even binned on new models could you use pbs cubes and then dicros to say combing 4 beams if part of their spectum just kinda touches, will you get some interference just on the edges of the spectrum or F up your whole beam. Looked all over and could not find out how far apart the wavelength would have to be to combine without knife edging or a pbs. Sorry about the Noob question but you got to learn somehow, and I lack the funds to do real world experiments to find out at this time:p
 
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Kizdawg

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Thanks I didnt see the 45 side on that mount till now.. I was origionally thinking that is somehow fit in the slot or something.. lmao.. I will maybe order a couple just to see how they can fit.
 

ARG

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So using dichros how much wavelength difference we talking. I wonder as new diodes come out and there peak is shifted or even binned on new models could you use pbs cubes and then dicros to say combing 4 beams if part of their spectum just kinda touches, will you get some interference just on the edges of the spectrum or F up your whole beam. Looked all over and could not find out how far apart the wavelength would have to be to combine without knife edging or a pbs. Sorry about the Noob question but you got to learn somehow, and I lack the funds to do real world experiments to find out at this time:p
Depends if you can find a dichro cabable of that and low and high wavelength 445nm diode. There is a very expensive dichro that can combine 642nm and 660nm, so it is possible one for 445nm and 455nm exists. The dichro is extremely touchy at close wavelengths and has to be exactly 45 degrees, which makes aligning it very hard; even in a projector.

They are also very expensive. Buying from Semrock they are around 200$ for 1 inch squared for speciality dichros. (Min order of 10)

I don't know if there is a dichro in Semrock's catalog that can combine a low wavelength 445nm diode with a high wavelength one. Interesting thought, but probably impracticable.
 
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