Abstract
A joule-level Nd:YAG nanosecond laser of high repetition frequency and high beam quality is developed out. The laser is designed as a MOPA system mainly including single longitudinal mode seed, pre-amplifier unit an d power amplifier unit. In order to obtain the high-quality laser beam output, phase conjugation is adopted to compensate the laser beam distortion. Under the condition of 200Hz high repetition frequency and 8.19μJ single pulse energy injected by the single longitudinal mode seed, 1.53J output energy is gained. The output laser beam is of 9mm diameter, 7.41ns pulse width, the far field beam spot 1.32 times the value of the diffraction limit, 1.2% energy stability (RMS) and less than 13μrad far field beam spot angle shift.
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