7 dB quadrature squeezing at 860 nm with periodically poled KTiOPO_4

摘要

The authors observed -7.2±0.2 dB quadrature squeezing at 860 nm by using a subthreshold continuous-wave pumped optical parametric oscillator with a periodically poled KTiOPO_4 crystal as a nonlinear optical medium. The squeezing level was measured with the phase of homodyne detection locked at the quadrature. The blue light induced infrared absorption was not observed in the experiment.