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Patent Granted PROBLEM TO BE SOLVED: To provide a pulse laser light source that stabilizes absolute frequencies in all the longitudinal oscillation modes. ; SOLUTION: A mode hopping suppression circuit 7 is provided in a resonator of a mode synchronous laser light source 1. A signal for adjusting the repetition frequencies from a clock extractor 51 and a PLL circuit 6 is fed-back negatively to a microwave phase control circuit 5 in a reproduction mode synchronous circuit so as to stabilize the frequency interval in a longitudinal oscillation mode of a laser beam.
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