| 摘要 |
There is disclosed an optically pumped solid-state laser with a dielectric crystal or glass host for the active medium. The pulse frequency, phase, height and width of relaxation oscillation pulsing are controlled by externally detecting the phase difference between a stable periodic perturbation of the pump light and the output pulse, then externally feeding back a signal to restore the laser output pulse phase to a fixed relationship to the phase of the perturbation. The perturbation can be provided by a small luminescent diode. Alternatively, the resonator loss can be modulated at the relaxation oscillation frequency by an acoustic cell in which the perturbations are scaled down by two or three orders of magnitude from those in an acoustic Q-switch. Moreover, relaxation oscillation pulsing of a single laser mode and frequency can be stimulated by employing the foregoing control technique and concurrently preventing spatial hole burning, specifically by varying the optical spacing between the ends of the laser rod and respective ones of the resonator mirrors simultaneously in inverse relationship.
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