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Old 01-16-2016, 04:30 AM #1
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Default Difference between polarized and non-polarized beam splitters

I've been googling polarized and non-polarized beam splitters tonight to try to understand where they are both used because I want to combine 450nm and 520nm together in a cube. Looking on ebay, I am finding both non and polarized broadband AR cubes, should I only consider using polarized cubes?

Reading this web page about prisms, it appears I must use polarized cubes:

Molecular Expressions Microscopy Primer: Physics of Light and Color - Introduction to Prisms and Beamsplitters


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Old 01-16-2016, 04:55 AM #2
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Default Re: Difference between polarized and non-polarized beam splitters

Well from my understanding if you want to combine two beams together you need polorized. The cube is really for splitting a polarized beam into two but it also works in reverse and is what you are trying to do.
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Old 01-16-2016, 05:09 AM #3
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Default Re: Difference between polarized and non-polarized beam splitters

OK thanks, then I need to find one which is either broadband coated or allows me to combine 450nm and 520nm together into one beam, but the thing needs to be about 12.7 to 15mm on a side square and be able to take 6 watts of blue and 1.5 watts of green. I've been searching ebay, found a couple, but don't know if that size of cube can take that much power.
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Old 01-16-2016, 05:11 AM #4
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Default Re: Difference between polarized and non-polarized beam splitters

Why not just use a dichro to combine the two colors?

A pbs cube won't transmit as much of the light as a dichro will. Less resistance less heat I would think.
Not sure either about what size you would need for 5 watts but you can ask the seller for the maximum power it can handle.

Last edited by VisibleGreen; 01-16-2016 at 05:14 AM. Reason: added info
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Old 01-16-2016, 05:18 AM #5
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Default Re: Difference between polarized and non-polarized beam splitters

OK, maybe I should do that, I guess a dicro will allow beams to overlap just as well, good idea.
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Old 01-16-2016, 05:26 AM #6
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Default Re: Difference between polarized and non-polarized beam splitters

Whew man 7w of cyan. That's gonna look so good.
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Old 01-16-2016, 05:40 AM #7
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Default Re: Difference between polarized and non-polarized beam splitters

I'm starting to think I might as well do a R,G,B but finding a high power red laser diode to balance out with the blue at 6 watts just isn't going to happen, there are no 6 watt red diodes out there yet.

Edit: Came back to add a statement, maybe I don't need so much red or blue power to mix with 1.2 watts of green to make white? Perhaps I will have far too much 450nm at 5-6 watts mixed with that power of green. I will google this and see what the typical powers are for each wavelength to make white. I was just basing this on how sensitive our eyes are to red and blue compared to green, which is only 10% as sensitive to the low and high ends of the visible color spectrum, but that might not apply when mixing r,g,b.
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"I regard consciousness as fundamental. I regard matter as derivative from consciousness..." - Max Planck. "Everything we call real is made of things that cannot be regarded as real" - Neils Bohr. "What we call physical things and events do not exist independently of subjective experience..." - Deepak Chopra.

Each of these three rabbit holes go deep, ending up in the same place.

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Last edited by Alaskan; 01-16-2016 at 05:50 AM.
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Old 01-16-2016, 06:15 AM #8
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Default Re: Difference between polarized and non-polarized beam splitters

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Originally Posted by Alaskan View Post
I'm starting to think I might as well do a R,G,B but finding a high power red laser diode to balance out with the blue at 6 watts just isn't going to happen, there are no 6 watt red diodes out there yet.

Edit: Came back to add a statement, maybe I don't need so much red or blue power to mix with 1.2 watts of green to make white? Perhaps I will have far too much 450nm at 5-6 watts mixed with that power of green. I will google this and see what the typical powers are for each wavelength to make white. I was just basing this on how sensitive our eyes are to red and blue compared to green, which is only 10% as sensitive to the low and high ends of the visible color spectrum, but that might not apply when mixing r,g,b.
I have a 5w 660nm cmount diode I bought awhile ago. Never been used. I suppose I could sell it to you but it's not cheap. I'd want 400 for it
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Old 01-16-2016, 06:34 AM #9
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Default Re: Difference between polarized and non-polarized beam splitters

Ha, I'm out of play money for awhile. I work in the oil field industry and all of the overtime I used to do has gone away with the price of oil, but thanks for the offer. I can't afford large expenses on this project. I do have a 900mw 638nm pointer, maybe I should just take the diode out of it and use for this project.

Edit: I wasn't aware there was such a higher power red laser diode, who made it?
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Sincerely investigate any of these three short quotes as new concepts and you've taken your first step into a larger world:

"I regard consciousness as fundamental. I regard matter as derivative from consciousness..." - Max Planck. "Everything we call real is made of things that cannot be regarded as real" - Neils Bohr. "What we call physical things and events do not exist independently of subjective experience..." - Deepak Chopra.

Each of these three rabbit holes go deep, ending up in the same place.

Useless troll fighting.

Last edited by Alaskan; 01-16-2016 at 06:40 AM.
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Old 01-16-2016, 06:44 AM #10
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Default Re: Difference between polarized and non-polarized beam splitters

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Originally Posted by Alaskan View Post
Ha, I'm out of play money for awhile. I work in the oil field industry and all of the overtime I used to do has gone away with the price of oil, but thanks for the offer. I can't afford large expenses on this project. I do have a 900mw 638nm pointer, maybe I should just take the diode out of it and use for this project.

Edit: I wasn't aware there was such a higher power red laser diode, who made it?
I understand. Um not sure who made it. They were available a few years ago and then the stock all dried up and no one had them. It's got a fac lens on it so all you need is a focusing lens. I'll try to find you a few threads about it here on lpf.
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Old 01-16-2016, 06:52 AM #11
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Default Re: Difference between polarized and non-polarized beam splitters

Why didn't you use it?
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"I regard consciousness as fundamental. I regard matter as derivative from consciousness..." - Max Planck. "Everything we call real is made of things that cannot be regarded as real" - Neils Bohr. "What we call physical things and events do not exist independently of subjective experience..." - Deepak Chopra.

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Old 01-16-2016, 08:14 AM #12
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Default Re: Difference between polarized and non-polarized beam splitters

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Why didn't you use it?
Well same as usual: no money. I might sell it on here now that I think of it.
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Old 01-16-2016, 08:41 AM #13
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Default Re: Difference between polarized and non-polarized beam splitters

i think that's normal for us laserist, we may have a bunch of diodes lying around, too many host that we never use we simply just grab it without second thought Ehgemus work his magic on the aluminium bar stock.
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Old 01-16-2016, 08:59 AM #14
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Default Re: Difference between polarized and non-polarized beam splitters

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i think that's normal for us laserist, we may have a bunch of diodes lying around, too many host that we never use we simply just grab it without second thought Ehgemus work his magic on the aluminium bar stock.
With this particular diode I wanted to use a copper heatsink and a special driver made by lazeerer. He told me that this diode is picky at start up so it needs a more sophisticated slow start sequence.
I got a host for it but just never got the heatsink and driver made.
I priced it pretty high for me right now so I just put it aside but now that I thought about it I could use the money.

It pains me to even think of selling it as I would love to see 4w of corrected 660nm light

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Old 01-16-2016, 09:41 AM #15
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Default Re: Difference between polarized and non-polarized beam splitters

i know the pain....
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Old 01-16-2016, 10:32 AM #16
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Default Re: Difference between polarized and non-polarized beam splitters

Here's a bunch of info
https://en.wikipedia.org/wiki/Beam_splitter
https://en.wikipedia.org/wiki/Polarizer
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Last edited by RedCowboy; 01-16-2016 at 12:57 PM.
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