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Defining the effective radius of curvature for a nonideal optical beam

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1 Author(s)
Siegman, A.E. ; Edward L. Ginzton Lab., Stanford Univ., CA, USA

A simple expression is given for evaluating the effective or average radius of curvature R(z) of an arbitrarily wrinkled, distorted, or nondiffraction-limited optical beam. This real-beam radius of curvature obeys the same free-space propagation equation as does the wavefront curvature of an ideal Gaussian beam. Extracting this correctable curvature from the beam at any plane simultaneously collimates the beam, makes that location a waist for the real beam, and minimizes the far-field beam divergence starting from that position

Published in:

Quantum Electronics, IEEE Journal of  (Volume:27 ,  Issue: 5 )

Date of Publication:

May 1991

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