• Imagine you are sipping tea or coffee while discussing various issues with a broad and diverse network of students, colleagues, and friends brought together by the common bond of physics, graduate school, and the physics GRE.

Post Reply
Posts: 1
Joined: Wed Oct 05, 2011 2:40 pm


Post by ram » Wed Oct 05, 2011 2:43 pm

Hi All,
This is my first post and I greatly appreciate your time.

Here is the problem statement:

I have an optical waveguide (laser) where the light is diverging in the x and y directions with different beam divergences. I would like to capture this light using a optical fiber with a lens (Lensed fiber), which is basically a normal optical fiber with a lens created at the tip. I would like to know how to calculate the radius of curvature of the lens.

To make the problem more simple. We can assume uniform divergence i.e., divergence same in the x and y directions. Knowing the beam divergence of the laser we can compute the Numerical aperture of the laser (NA), and may be pick the lens with larger NA, however how to arrive at the radius of curvature of the lens still remains a question. Your feedback is appreciated, and feel free to ask me questions if you need any clarification or details.

User avatar
Posts: 2296
Joined: Tue May 29, 2007 8:46 pm

Re: Optics

Post by grae313 » Thu Oct 06, 2011 10:31 am

I moved this post to the lounge because it is not a GRE-level problem.

Post Reply