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Binary gratings for CO2 laser-beam diagnostics

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Abstract

Properties of binary gratings for beam diagnostics of high-power CO2 lasers are investigated. The layout uses a modal theory that includes absorption of metallic surfaces by an impedance boundary condition. Radiation-resistant gratings were fabricated in copper with photolithography combined with galvanic technology. In this way gratings have been realized in which the first-order diffraction efficiencies are polarization independent. Use of a second grating to reduce elliptical beam distortion is demonstrated. Finally it is shown that Rayleigh anomalies for binary diagnostic gratings are accompanied by high absorption.

© 1996 Optical Society of America

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