CONTROL DEVICE, CONTROL METHOD, AND PROGRAM

摘要

There is provided a control device including a light source control section (301) to cause laser light emitted from a laser light source (10) to be emitted as pulse laser light by intermittent drive, a drive section (311) to move at least one of reflection sections (207) of a resonator (21) in an optical axis direction, and a servocontrol section (313) to servocontrol a light path length of the resonator (21) by causing the drive section (311) to move the at least one of the reflection sections (207) in such a manner to meet a resonance condition, on the basis of an error signal that indicates a difference between the light path length of the resonator according to a synchronously detected reflected light from the resonator and a light path length that meets the resonance condition of the pulse laser light that enters the resonator. The system may comprise an external cavity laser diode (10) mode-locked by an electric modulation signal (301), its output is amplified by a SOA (131) being driven by a pulsed signal (40) in synchronisation (302) with the ECLD (10) resulting in pulse bursts. The pulse bursts may be used to synchronously pump an OPO (20) having a non-linear optical crystal (213). The OPO has a servo loop for length stabilisation based on the difference of the modulation signal of the laser (301) and the OPO output frequency (307). In order to prevent instabilities in the OPO output, the pulse burst frequency is larger than the cut-off frequency of the servo loop.