diachi
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- Feb 22, 2008
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Beam mask, ok cool.
I had seen Planters using razor blades attached by magnets to bolt in blocks in his optical train to clean up overspray of mitsu reds, I think he called that spacial filtering, but I see that it's more than being internal or external now.
Beam mask sounds right and is easier to understand. :beer:
Yeah, the razor blade method is one way to do it, although a proper pinhole with X/Y mounts would be easier to work with and would likely produce better results. Some people have been using the lasers they are trying to correct to punch their own pinholes, which then correct the beam.
Here's an RGB module using achromatic lenses and a pinhole in an X/Y mount to spatially filter all three lasers at once. You can see where the achromatic lens focuses the combined beams into the pinhole, then the second achromatic lens re-collimates the beams. This also allows you to do expansion and spatial filtering in one "stage". Really just a Keplerian Telescope and a pinhole.
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