Abstract

We present a $\mathrm{Nd}\text{:}{\mathrm{GdVO}}_4$ bulk crystal oscillator with $>70\mathrm{W}$ ${\mathrm{TEM}}_{00}$ laser output based on the orthogonal thermal compensation architecture. The asymmetry of thermo-optical effects in the anisotropic crystal was well compensated for, and the overall thermal load was also distributed to lower the crystal temperature and the risk of crystal fracture. At an output coupling of 60%, a 71.2 W, ${\mathrm{TEM}}_{00}$ laser output was achieved with 44% optical efficiency. The diffraction-limited beam quality was measured to be $M_x^2=1.01$ and $M_y^2=1.04$ in the orthogonal directions.

© 2018 Optical Society of America

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