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Abstract
We report a compact, long nanosecond (ns) pulse duration stretched laser source by a multi-pass cavity (MPC). Based on the combination of the MPC and pump power, a high-power high beam quality 1064nm Q-switched Nd:YAG laser with a pulse duration adjustable over the range of 160-1000ns was obtained at a pulse repetition frequency of 10kHz for the first time, to the best of our knowledge. At a typical pulse width of 560ns, an average output power of 10.6W was successfully achieved. The beam quality factor M2 was measured to be 1.45 with a good Gaussian mode.
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