METHOD FOR STABILIZING LASER-EMISSION FREQUENCY AND EMISSION- FREQUENCY STABILIZED LASER Russian patent published in 2005 - IPC

FIELD: laser engineering; existing and newly developed frequency-stabilized lasers for metrology, spectroscopy, navigation and location systems.

SUBSTANCE: proposed method includes generation of emission power resonance in laser resonator, measurement of signal proportional to laser output emission power, modulation of laser resonator by test signal, estimation of polarity of emission power resonance, and shaping of signal for tuning laser resonator to extremum of laser emission power resonance with respect to current gradient polarity. Used as test signal is signal proportional to noise fluctuations of laser emission frequency; polarity of current emission-power resonance gradient is determined by signal proportional to laser output emission power and mentioned test signal; tuning signal equals constant-amplitude value whose polarity is same as that of current gradient. Proposed laser has resonator provided with first piezoelectric corrector and piezoelectric transducer; photodetector that functions to detect laser emission power; first amplifier designed to amplify laser emission power signal arriving from photodetector; output emission power gradient polarity identifier; high-voltage amplifier whose input is connected to output of gradient polarity identifier and output, to piezoelectric corrector; second amplifier that functions to amplify signal proportional to noise fluctuations of laser emission frequency. Output of first amplifier is connected to first input of gradient polarity identifier. Output of second amplifier is connected to second input of gradient polarity identifier. Piezoelectric transducer is connected to input of second amplifier.

EFFECT: enhanced stability of laser emission frequency due to higher precision of resonator tuning to extremum of reference line.

2 cl, 3 dwg