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Old 12-27-2010, 06:01 AM #1
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Default Theory / Approaches for combining beams of the same wavelength?

I've seen reference to multiple diode arrays, or to the combining of two (same wavelength) beams. I'm wondering how this is done?

I understand the concept behind using dichroic films to combine different wavelengths, but I don't yet understand how you would combine two (say 1W 445nm) beams to create a more powerful single combined beam.

I've done a bit of research to figure this out, and came across some approaches requiring polarized beams, but it seemed somewhat complex. Is there a practical approach used frequently for hobby-level laser builds, that might not break the bank?


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Old 12-27-2010, 01:50 PM #2
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Default Re: Theory / Approaches for combining beams of the same wavelength?

You need to use a Polarised Beam Splitter Cube (PBS) and have the 2 diodes horizontally & vertically opposed (polarisation?)

Heres the build I done.

The Pain of Beam Combining...I See Red!
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Old 12-27-2010, 02:00 PM #3
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Default Re: Theory / Approaches for combining beams of the same wavelength?

There's also a technique called "knife edging". You search for it, and you shall find info.
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Old 12-27-2010, 02:25 PM #4
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Default Re: Theory / Approaches for combining beams of the same wavelength?

Here is an example of knife edging on a big scale.

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