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Old 09-29-2011, 09:17 PM #33
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Default Re: Parabolic lens

Then you are maybe right with your guess and it is the 441
It would be interesting which of these lenses have the best attributes for beamcorrection..
Is there no one with an degree in optics around?


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Old 09-29-2011, 09:36 PM #34
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Default Re: Parabolic lens

Cyparagon has a good expertise in optics
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Old 09-30-2011, 03:48 AM #35
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Default Re: Parabolic lens

Edmund's tech images make me think that the beam profile looks better because only the beams center is getting through without being refracted and the edges are being scattered all over the place, kind of like pin-holing and scattering the rest of the beam. This (along with reflection and material) would account for the reduction in spot brightness. On the other hand, I would bet that anything placed directly on the small end is likely to be burned quite easily with the laser directed in through the other end (at nearly any angle, from what I can tell!). I could be wrong, as I am definitely not an optical engineer.
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Old 09-30-2011, 03:24 PM #36
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Default Re: Parabolic lens

Are those supposed to condense light into a fiber, i.e. shine laser into larger diameter end and put fiber end at focal point in front of the smaller diameter end?
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Old 09-30-2011, 03:49 PM #37
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Default Re: Parabolic lens

I don't think you can properly couple a laser into a fiber using a CPC because the focal point of the incoming colimated beam is within the CPC itself at the parabola's focus, and the planar wave is transformed into a spherical one.
Hmm... any experts on optics care to confirm or correct this?
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Old 09-30-2011, 05:06 PM #38
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Default Re: Parabolic lens

I measured the power with the beam focused by the parabolic lens. The peak is about 260 mW... from a 1.3 W laser
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Old 09-30-2011, 06:02 PM #39
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Default Re: Parabolic lens

wow...that is realy bad!
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Old 10-01-2011, 01:53 AM #40
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Default Re: Parabolic lens

Quote:
Originally Posted by Arayan View Post
I measured the power with the beam focused by the parabolic lens. The peak is about 260 mW... from a 1.3 W laser
Thank you. This is what I wanted to know.
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Old 10-03-2011, 04:08 PM #41
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Default Re: Parabolic lens

BTW I confirm that the lens is this model:


Thanks guys I appreciated your comments
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Focusable 150 mW, 532 nm
5 mW, 532 nm, Laserglow Anser
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380 mW, 635 nm, the Copperhead by Wolfman Link
170 mW, 650 nm from jeffreythe00 Link
double beam pointer <5 mW, 650 nm ; 532 nm, Z-Bolt
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