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An intracavity KTiOPO4 (KTP) frequency doubling laser emitting at 561?nm is achieved within a diode side-pumped acousto-optically Q-switched Nd:YAG laser. A compact convex?flat straight cavity is employed to achieve the compact configuration, where coatings are specially designed to suppress unwanted lines. At the pump power of 147?W and the pulse repetition rate of 10?kHz, the output power of 8.1 W was obtained at 561?nm. The corresponding optical-to-optical conversion efficiency is 5.5%. The pulse width of a 561?nm wave is 210?ns. The M2 factors are measured to be 15.5 and 17.5 in the horizontal and vertical directions respectively.
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Shen et al. (2013) studied this question.
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