Near diffraction-limited laser output from a very large size rectangular core crystalline waveguide

OPTICS LETTERS(2019)

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摘要
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 mu m x 400 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. (C) 2019 Optical Society of America
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