How can I calculate the fresnal reflections of a laser beam from a lens surface if the mode of the laser beam is unknown?

07 September 2022 1 1K Report

I have a laser beam whose Polarization State Extinction Ratio is 20db.

I need to calculate the fresnal reflections of the beam from each surface of the lens.

I’m afraid the answer is you can’t. You are going to have to assume some transverse intensity profile to do the integrals at each lens surface.

On the other hand, if the optics aren’t too fast and the angles aren’t too steep, the Fresnel coefficients don‘t change all that rapidly with angle, and even a rough guess at the beam profile will give a pretty good answer.

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