Abstract

Near diffraction-limited laser output from a very large size rectangular core crystalline waveguide laser was achieved experimentally. A crystalline waveguide, with a rectangular core size of $320\mathrm{\mu m}\times 400\mathrm{\mu m}$ by 1.0 at.% Yb:YAG (core) and 0.5 at.% Er:YAG (cladding), was designed and fabricated. The rectangular core area was approximately 64 times larger than the conventional device core area. Using a continuous diode laser end pumping, an output power of 26 W, with the beam quality of $M_x^2=1.22$, $M_y^2=1.05$ in the far-field, was obtained in the experiment. The design method that is used to enlarge the crystalline waveguide core size and suppression high-order transverse mode, can be applied for various kinds of crystalline waveguide lasers.

© 2019 Optical Society of America

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