Patent ID: 7835411
Filing Date: 2010-11-16
Classification: H01S

Abstract:
1. A laser frequency stabilizing device capable of establishing resonance of a pumping light in a resonant cavity to produce a laser light, and varying a resonant cavity length to stabilize an oscillation frequency of the laser light, the device comprising: a laser light producer operative to produce and emit the laser light containing a first longitudinal mode light and a second longitudinal mode light having different wavelengths; a spectrometer operative to spectrally decompose the laser light emitted from the laser light producer into the first longitudinal mode light and the second longitudinal mode light; an absorption cell for absorbing the first longitudinal mode light decomposed by the spectrometer within a specific frequency range to yield an absorption light; a first detector operative to detect the absorption light output from the absorption cell; a second detector operative to detect a signal intensity of the first longitudinal mode light; a third detector operative to detect a signal intensity of the second longitudinal mode light; an actuator operative to change the resonant cavity length; a first drive controller operative to detect a saturated absorption signal contained in the absorption light detected at the first detector and control driving the actuator based on the saturated absorption signal; a second drive controller operative to control driving the actuator such that the signal intensity of the first longitudinal mode light detected at the second detector and the signal intensity of the second longitudinal mode light detected at the third detector have a ratio of a certain value; and a switcher operative to switch the control of the actuator between the control by the first drive controller and the control by the second drive controller, wherein the switcher switches the control by the first drive controller to the control by the second drive controller for control of the actuator when the saturated absorption signal meets the oscillation frequency of the laser light under the control of the first drive controller.