Patent ID: 7058094

Claim:
A Q-switch laser device for outputting a pulse laser from an optical resonator, the device comprising: a Q-switch for changing any of a high value and low value of a Q-value for said optical resonator; a switch pulse generation means for generating a switch pulse, which has a frequency for determining a repetition period of said pulse laser; an RF oscillation means for generating an RF signal, which is a signal of a higher frequency than a frequency of said switch pulse; a pulse synchronization means for inputting said switch pulse and said RF signal and outputting a phase synchronization pulse, where arising timing of said switch pulse is synchronized with a phase of said RF signal; and an RF modulation means for inputting said phase synchronization pulse and outputting said RF signal as an RF modulation signal of said RF signal that is made ON/OFF, corresponding to a period of any of an L-level and H-level of an input pulse, wherein said Q-switch changes the Q-value of said optical resonator to any of the high value and the low value, based on said RF modulation signal.