Modification of mid-infrared radiation spatial structure caused by COP/Ag hollow waveguide

The beam spatial structure of mid-infrared laser radiation delivered by hollow glass waveguides was investigated. As laser sources flash-lamp pumped Er:YAG, Tm:YAG, and diode-pumped Tm:YAG, Tm:YAP laser systems generating radiation in a free-running regime were designed and constructed. The base of transfer systems was cyclic olefin polymer-coated silver hollow glass waveguide having 700 &mgr;m inner diameter and length up to 1.3 m. The changes of beam spatial structures through the delivery system are presented. For Er:YAG laser system the waveguide was investigated both straight and bent cases and also output laser beam stability was observed. The energy transmission characteristics were measured for all systems.

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