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Analysis of laser beam quality degradation caused by quartic phase aberrations

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Abstract

Simple formulas are derived for the degradation in the beam-quality factor, M2, of an arbitrary laser beam caused by quartic phase distortions such as those that might occur in a spherically aberrated optical component, a thermally aberrated laser output window, or a divergent beam emerging from a high-index dielectric medium as in a wide-stripe, unstable-resonator diode laser. A new formula for the defocus correction that is needed to collimate optimally a beam with quartic phase aberration is also derived. Analytical results and numerical examples are given for both radially aberrated and one-dimensional transversely aberrated cases, and a simple experimental measurement of the beam-quality degradation produced by a thin plano–convex lens is shown to be in good agreement with the theory.

© 1993 Optical Society of America

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