QUADRATURE PHASE-SQUEEZING OF PUMP FIELD REFLECTED FROM TRIPLY RESONANT QUASI-PHASE-MATCHED OPTICAL PARAMETRIC OSCILLATOR
三共振准相位匹配光学参量振荡器反射抽运场的正交位相压缩

A quasi- phase-matched optical parametric oscillator(QPM OPO)consisting of a periodically poled LiNbO3(PPLN) crystal is pumped by an all-solid state single frequency Nd:YVO4 laser. The triple resonance of the pump mode and two subharmonic modes with near- degenerate frequencies are experimentally demonstrated by means of precision temperature control of the crystal. The threshold pump power is only 1.2mW. The quadrature phase noise squeezing of the pump field reflected from the OPO up to 1.1dB is observed at the pump power of 2.8 times of the oscillation threshold. The numerically calculated result is in good agreement with the experimentally measured data.