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Proceedings Paper

Unstable resonator for COIL
Author(s): Wolfgang O. Schall; Thomas Hall; Juergen Handke
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Paper Abstract

An unstable double-pass resonator of the hybrid, confocal type has been designed for outcoupling the radiation of a 10 kW chemical oxygen-iodine laser (COIL) with optimum beam quality. The single pass gain length is 20 cm and the measured small signal gain is 1.1 m-1. The near and far field mode distributions have been calculated by solving the Kirchhoff-Fresnel integral for optimum mirror alignment as well as for a misaligned resonator. A particular problem is the provision of glass mirrors with large radii of curvature for the preferred resonator of the positive branch. These radii are a consequence of the low total round trip gain of smaller COILs. The problem has been solved by using one-element adaptive minors. A second problem has been identified in the high sensitivity in angular adjustment of the resonator mirrors.

Paper Details

Date Published: 25 January 2001
PDF: 4 pages
Proc. SPIE 4184, XIII International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference, (25 January 2001); doi: 10.1117/12.413976
Show Author Affiliations
Wolfgang O. Schall, DLR (Germany)
Thomas Hall, DLR (Germany)
Juergen Handke, DLR (Germany)

Published in SPIE Proceedings Vol. 4184:
XIII International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference
Antonio Lapucci; Marco Ciofini, Editor(s)

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