Mode competition in acousto-optically Q-switched planar waveguide lasers |
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Authors: | Jianqiu Xu HJ Baker DR Hall |
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Institution: | aShanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, P.O. Box 800-211, Shanghai 201800, China;bDepartment of Physics, School of Electronic Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, UK |
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Abstract: | Multi-mode rate equations have been developed to investigate mode competition in high-power acousto-optically Q-switched planar waveguide lasers. The mode competition arises from coupling effects and temporal losses in the transform between guided modes and free-space propagation. Pulse-to-pulse instability and temporal beam distortions are enlarged by mode competition when the laser works in the multi-mode regime. The influence of parasitic oscillation is also discussed. A Nd:YAG planar waveguide laser has been established with a folded hybrid/unstable resonator. A maximum average power of 83 W with a beam propagation factor is obtained. The theoretical simulation agrees well with the experimental observation. |
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Keywords: | Q-switching Mode competition Planar waveguide laser |
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