| 摘要 |
In the case where, e.g., because of provision of a high-gain and high-energy Q-switched laser oscillator in a laser system in a MOPA configuration, the duration tauz from the time point when oscillation-stage Q switches (13a and 13b) start the gate ON to the time point when a pulse laser beam (18) starts to grow is shorter than the fall time tauf of amplification-stage Q switches (13c, 13d, and 13e), by implementing control in such a way that the gate-ON timing of the oscillation-stage Q switches (13a and 13b) lag behind the gate-ON timing of the amplification-stage Q switches (13c, 13d, and 13e) by a predetermined time, the loss in the pulse laser beam (18) at the amplification-stage Q switches (13c, 13d, and 13e) can be prevented, while the gain deterioration due to a spontaneously amplified ray (17) produced in the amplification stage is being suppressed. Therefore, a high-energy pulse laser beam can efficiently be obtained.
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