The direct oscillation of high pulse energy and high average power nanosecond laser is limited by the limited aperture of the gain medium and Q-switched devices. In this Letter, the stable-unstable hybrid resonator with a tapered scraper mirror (TSM) for laser output is selected to overcome the difficulty. The sharp edges of the hollow-square scraper mirror guarantee the safety operation. A 207 mJ pulse energy, 500 Hz repetition rate, 53.5 ns pulse width laser output is obtained from the hybrid resonator with a 3 times magnification in the unstable direction, corresponding to a 3.87 MW peak power. The beam quality in the thickness and width directions of the slab are βx = 1.23 times and βy = 1.50 times diffraction limits, respectively. This method provides a potential solution for the generation of high pulse energy and high average power nanosecond laser, and has good potential in the industry use and other scenarios with compactness requirement.
Yang et al. (Wed,) studied this question.
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