Enhanced Beam Quality for Medical Applications
at 6.45 m by Using a RISTRA ZGP OPO¹

G. Stoeppler*, M. Schellhorn, and M. Eichhorn

French–German Research Institute of Saint-Louis ISL, 5 rue du Général Cassagnou, 68301 Saint-Louis, France

*e-mail: georg.stoeppler@isl.eu

Received November 14, 2011; in final form, February 2, 2012; published online May 11, 2012

Abstract—A high-average power ZGP OPO with a nonplanar ring RISTRA cavity, pumped by a Ho³⁺:LLF
MOPA is presented. A maximum pulse energy at 100 Hz repetition rate of 5.67 mJ at 6.45 m with a M² = 1.8
was achieved. The slope efficiency was 16% and the emission spectrum is shown. With a repetition rate of 200
Hz an average output power of 0.95 W at 6.45 m was reached.

DOI: 10.1134/S1054660X12060114

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