Laser light generating apparatus and method
First Claim
1. A laser light generating apparatus comprising:
- a laser light source for outputting laser light;
a phase modulator and a signal generating unit for generating a modulating signal to be applied to the phase modulator;
a plurality of resonators including a first resonator and a second resonator disposed in a stage succeeding the first resonator;
a nonlinear optical element disposed in the first resonator;
an optical path length varying means for changing length of an optical path of each of the resonators;
an optical system disposed between the laser light source and the resonators and between two resonators for providing coupling between the laser light source and the resonators and between the two resonators;
a photodetector for receiving light from each of the resonators; and
a control circuit having a negative feedback configuration for obtaining an error signal from a detection signal obtained by the photodetector and the modulating signal and controlling the optical path length varying means by an FM sideband method using the error signal;
wherein the laser light is inputted to the phase modulator, subjected to phase modulation, and then inputted to the first resonator, and light generated by the nonlinear optical element is inputted to the second resonator; and
the light from each of the first resonator and the second resonator is detected by the photodetector, and the length of the optical path of each of the resonators is controlled on the basis of the error signal, whereby the plurality of resonators are or can be simultaneously held in a resonant state.
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Abstract
A laser light generating apparatus is provided with a laser light source, a phase modulator, a signal generating unit for applying a modulating signal to the phase modulator, and resonators. A nonlinear optical element is provided in the resonator, and an optical path length varying means for changing length of an optical path of each of the resonators is provided. Error signals are obtained using detection signals of photodetectors for receiving light from the resonators, respectively, and the optical path length varying means is controlled by a sideband method, whereby a control circuit having a negative feedback configuration for controlling length of the resonators is formed. Laser light is subjected to phase modulation and then inputted to the resonator, and light generated by the nonlinear optical element is inputted to the resonator so that the plurality of resonators are simultaneously held in a resonant state.
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Citations
26 Claims
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1. A laser light generating apparatus comprising:
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a laser light source for outputting laser light;
a phase modulator and a signal generating unit for generating a modulating signal to be applied to the phase modulator;
a plurality of resonators including a first resonator and a second resonator disposed in a stage succeeding the first resonator;
a nonlinear optical element disposed in the first resonator;
an optical path length varying means for changing length of an optical path of each of the resonators;
an optical system disposed between the laser light source and the resonators and between two resonators for providing coupling between the laser light source and the resonators and between the two resonators;
a photodetector for receiving light from each of the resonators; and
a control circuit having a negative feedback configuration for obtaining an error signal from a detection signal obtained by the photodetector and the modulating signal and controlling the optical path length varying means by an FM sideband method using the error signal;
wherein the laser light is inputted to the phase modulator, subjected to phase modulation, and then inputted to the first resonator, and light generated by the nonlinear optical element is inputted to the second resonator; and
the light from each of the first resonator and the second resonator is detected by the photodetector, and the length of the optical path of each of the resonators is controlled on the basis of the error signal, whereby the plurality of resonators are or can be simultaneously held in a resonant state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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16. A laser light generating method of phase-modulating laser light, then inputting the phase-modulated light to a plurality of resonators, detecting light obtained from each of the resonators, obtaining an error signal from a detected signal and a modulating signal used for the phase modulation, and thereby variably controlling length of an optical path of each of the resonators by an FM sideband method, said laser light generating method comprising the steps of:
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inputting the laser light phase-modulated by a phase modulator to a first resonator and then inputting light generated by a nonlinear optical element disposed within the first resonator to a second resonator; and
detecting light from each of the first resonator and the second resonator, generating an error signal from each of detected signals and the modulating signal, and thereby controlling the length of the optical path of each of the resonators, whereby the plurality of resonators are simultaneously held in a resonant state.
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Specification