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?

Cyparagon has a good expertise in optics

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.

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?

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? :anyone:

I measured the power with the beam focused by the parabolic lens. The peak is about 260 mW... from a 1.3 W laser

wow...that is realy bad!

Arayan said:

I measured the power with the beam focused by the parabolic lens. The peak is about 260 mW... from a 1.3 W laser

Click to expand...

Thank you. This is what I wanted to know.
+ Rep :thanks:

BTW I confirm that the lens is this model:


Thanks guys I appreciated your comments