Abstract
We demonstrate a sub-nanosecond, high peak power Yb:YAG/Cr4+:YAG/YVO4 passively Q-switched Raman micro-laser (PQSRML) operating at 1134 nm. The effect of transmission of the output coupler (TOC) and Cr4+:YAG initial transmission (T0) on the Raman laser performance have been investigated. Stable Raman laser pulse trains have been observed for Yb:YAG/Cr4+:YAG/YVO4 PQSRMLs with different combinations of output couplers and Cr4+:YAG crystals. Maximum average output power of Raman laser was 142.8 mW with TOC = 11% output coupler and T0 = 90% Cr4+:YAG. Enhanced Stokes pulse performance of 24.1 μJ, 45.1 kW, 535 ps was achieved with TOC = 16% and T0 = 85% Cr4+:YAG. A modified Raman laser rate equation model is established and the theoretically calculated results are in fairly good agreement with experimental results.
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