Hi all,
in our booster we can't install a streak camera / beam line. So, we are thinking about coupling light from a view port into a fiber and transport it to the streak camera (~20m). Does someone have experience with coupling bending magnet radiation into a fiber? Which coupler to use, how to focus, which fiber, which frequency (range)?
I appreciate any suggestions.
Thanks,
Johannes
Hi Johannes,
I read and understand your problem, and I think your approach of using a fiber to get the light from the tunnel
to your lab is feasible, but I have no direct experience with it. Stay in touch, and share your future experience,
it is certainly relevant.
Dear Johannes
Our group had the idea to couple SR light into an optical fiber to convey the light to a fast photodiode (with an active area of 200 um^2) and we tried a proof-of-principle using a liquid light guide (something like: https://www.edmundoptics.com/f/liquid-light-guides/11425) at an optical table with SR since the liquid cable has a large inlet aperture, high transmission, and a large numerical aperture (for easy coupling).
In the test, the transmission was okay and input coupling was easy since that light guide has a large aperture.
But it is difficult to get proper outcoupling optics for the small active area. Due to the large NA, the light is quickly diverse and then it demands a lens close to the output port of the light guide. But this leads to a small magnification that causes the loss of a lot of light intensity. I guess this is the same issue for the streak camera.
Best regards
Ji-Gwang Hwang
Dear Kees and Ji-Gwang,
thanks much for your comments.
Quote from: Ji-Gwang Hwang on September 17, 2021, 11:56:25 AM
[...] we tried a proof-of-principle using a liquid light guide (something like: https://www.edmundoptics.com/f/liquid-light-guides/11425) at an optical table with SR since the liquid cable has a large inlet aperture, high transmission, and a large numerical aperture (for easy coupling).
This is an option we did not think about. Thanks!
We will not be able to avoid setting up a test setup in the lab. If we find something useful you will hear about it ;-)
Cheers,
Johannes