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Old 06-29-2013, 10:10 AM #1
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Default PBS Cube Maximum Power

Hi LPF,
I have recently dismantled a 8x DVD laptop burner and I have got the dichros, lens and the PBS cube intact.
I would want to use that PBS cube to combine the beams of two LPC-836 diodes @ >300mw. From what I can see, this cube is coated (normal blue tint, reddish at certain angles) and for sure it's for 630-650nm.
But I don't know if it's safe to mix that power in a 3x3x3mm one.
Do you think I can do this with it or should I buy a new one?

And could I mix 900mw+900mw of 635nm with it? It would be cool to see a near 2W red laser pointer

Thanks in advance
Gonzalo


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Old 06-29-2013, 01:53 PM #2
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Default Re: PBS Cube Maximum Power

I'd only mix single mode diodes, because multimode, having a non-gaussian beam, when mixed, will give you a + pattern instead of a pattern. Thats undesired and expensive to correct (waveplate corrects this - $100 EA.).

The coating probably will reflect a lot more light than a uncoated prism, so probably you can mix 2W with safety with it... Just don't put blue light on it. It is coated for IR and red.

I found one 2 or 3 days ago.
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Old 06-29-2013, 02:11 PM #3
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Default Re: PBS Cube Maximum Power

Thanks. I already thought it would be nearly impossible to mix multimode diodes. But are the lpc-826/836 multimode?
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Old 06-29-2013, 02:16 PM #4
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Default Re: PBS Cube Maximum Power

No. They are single mode. But you said

"And could I mix 900mw+900mw of 635nm..."

Yeah thats possible but the results would be a + beam, because you will have two fast-axis combined, one vertical and one horizontal.

BUT for single mode diodes you should have no problems other than aligning...
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Old 06-29-2013, 02:25 PM #5
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Default Re: PBS Cube Maximum Power

Yes, I know. My fault.

Well, if you consider aligning isn't a problem ........You are amazing

Now really, will alignment be a problem with a custom machined host and two AiXiZ modules
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Old 06-29-2013, 02:42 PM #6
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Default Re: PBS Cube Maximum Power

I don't think it is a problem.
If you have a couple hours and the correct setup it is easy to do.

Focused to infinity, just above lasing threshold (80mA) and with screws to >>slowly<< move the laser, I think it should be feasible. Not your weekend project tho...
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Old 06-29-2013, 02:50 PM #7
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Default Re: PBS Cube Maximum Power

That's good news. Time to buy some diodes
Thank you very, very much. Glad to see that people like you are in this forum helping to others
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Old 06-29-2013, 02:53 PM #8
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Default Re: PBS Cube Maximum Power

No problem
Any doubts just post here!

Use goggles ok. Dealing with optics + lasers are dangerous. Play safe

I can recommend LPC-826's from "Techhood", on ebay. They are $10 ea and free shipping. Brand new, non extracts
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Old 06-29-2013, 02:59 PM #9
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Default Re: PBS Cube Maximum Power

Yes, for blue&green I have dragonlasers googles which i bought with my first > 5mw pointer and I have to buy some for red. I don't want to loose or damage my "seeing balls".
Thanks for all

Kind regards,
Gonzalo
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