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 Laser Pointer Forums - Discuss Laser Pointers 638 correction with only 2 lenses?

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09-14-2012, 08:11 PM #1
 Class 2M Laser Join Date: Mar 2011 Location: Texas Posts: 692 Rep Power: 52
justinjja
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638 correction with only 2 lenses?

Would this work?
With a small Cylinder Lens sitting right on the diode?
Is this how a FAC works?

The angle of the wider axis is 35 degrees, and the narrower one is 7.5 degrees

Is there a simple calculation of the the focal length would need to be based on getting 7.5 degrees to 35 degrees?

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09-14-2012, 09:23 PM #2
 Class 4 Laser Join Date: Sep 2007 Location: Wisconsin Posts: 9,144 Rep Power: 9321
Cyparagon
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Re: 638 correction with only 2 lenses?

Yes, that's how a FAC lens works. They often use a small glass rod instead of cylinder lens though. The problem is properly mounting something that tiny.
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09-15-2012, 08:19 AM #3
 Class 4 Laser Join Date: Oct 2007 Location: Oregon, USA Posts: 5,478 Rep Power: 3157
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Re: 638 correction with only 2 lenses?

I've been able to correct one axis just fine with those cylindrical lenses, but I can't get it to work properly in conjunction with a lens like those Aixiz lenses. With other lenses I'm sure it'll work (and it does), but they're uncoated, so you lose quite a bit of power, and they also muddy up the spot.

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