Unstable resonator for COIL

Wolfgang O. Schall; Thomas Hall; Juergen Handke

doi:10.1117/12.413976

25 January 2001 Unstable resonator for COIL

Wolfgang O. Schall, Thomas Hall, Juergen Handke

Proceedings Volume 4184, XIII International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference; (2001) https://doi.org/10.1117/12.413976
Event: XIII International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference, 2000, Florence, Italy

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.

Citation Download Citation

Wolfgang O. Schall, Thomas Hall, and Juergen Handke "Unstable resonator for COIL", Proc. SPIE 4184, XIII International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference, (25 January 2001); https://doi.org/10.1117/12.413976

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