25 January 2001 Unstable resonator for COIL
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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.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Wolfgang O. Schall, Wolfgang O. Schall, Thomas Hall, Thomas Hall, Juergen Handke, 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); doi: 10.1117/12.413976; https://doi.org/10.1117/12.413976
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