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Laser oscillation in Yb:YAG waveguide beam-splitters with variable splitting ratio

机译:可变分束比的Yb:YAG波导分束器中的激光振荡

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In this Letter, we report on laser emission from Yb:YAG beam-splitters fabricated by direct femtosecond-laser inscription. These devices consist of two adjacent mirrored s-curved waveguides merged into a section allowing for multi-mode interference (MMI) and a straight waveguide. Nine-millimeter-long one-to-two beam-splitters with radii of curvature between 10 and 80 mm have been fabricated resulting in separations between the two arms of up to 0.65 mm. Due to the MMI-section, the splitting ratio was variable by slightly changing the incoupling conditions. Maximum laser output powers of 2.29 W and slope efficiencies of 52% were achieved with the best beam-splitter waveguide laser. For all radii of curvature exceeding 10 mm, similar efficiencies were demonstrated. (C) 2015 Optical Society of America
机译:在这封信中,我们报告了通过飞秒激光直接刻写而成的Yb:YAG分束器发出的激光。这些设备由两个相邻的镜像S形弯曲波导组成,合并成一个允许多模干涉(MMI)的部分和一个直波导。已经制造出九毫米长的一到两个分束器,曲率半径在10到80毫米之间,导致两个臂之间的间距最大为0.65毫米。由于MMI截面的原因,通过稍微改变耦合条件可以改变分光比。使用最佳的分束器波导激光器可实现2.29 W的最大激光器输出功率和52%的斜率效率。对于所有超过10 mm的曲率半径,都证明了相似的效率。 (C)2015年美国眼镜学会

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