We present a frequency selective optical setup based on a Gires-Tournois interferometer suitable to enforce single-frequency operation of high power lasers. It is based on a birefringent Gires-Tournois interferometer combined with a λ/4 plate and a polarizer. The high-reflective part of the Gires-Tournois interferometer can be contacted to a heat sink to obtain efficient cooling (similar cooling principle as for the active medium in thin-disk lasers) enabling power scaling up to output powers in the kW range.
Karsten Schuhmann, Klaus Kirch, Mirosław Marszałek, Martin Pototschnig, Laura Sinkunaite, Gunther Wichmann, Manuel Zeyen, and Aldo Antognini, "Polarizing Gires-Tournois interferometer as intra-cavity frequency-selective element in high-power lasers," Proc. SPIE 10513, Components and Packaging for Laser Systems IV, 105131A (Presented at SPIE LASE: February 02, 2018; Published: 20 February 2018); https://doi.org/10.1117/12.2289516.
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