Abstract
We report on a compensation characteristic of the phase shifts, originating from the cavity detuning and phase mismatching, in the process of squeezed state generation. In the experiment, the maximum level of squeezing was not generated under coresonance in a doubly resonant optical parametric oscillator (OPO), which was theoretically explained based on the motion equation of the OPO. Furthermore, the power dependence of the squeezing and antisqueezing was also measured at the coresonance and the optimum noise reduction status. The results revalidated the compensation mechanism. Finally, the amplitude quadrature (or vacuum) noise reduction was raised to 11.7 dB (or 12.3 dB) at 8 MHz by finely tuning the crystal temperature away from coresonance.
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