Development of Tunable Squeezed-light Source and Its Application to Spectroscopy

我们利用KNbO_3晶体的倍频环形腔产生了可调谐在430nm左右的振幅压缩光。腔体由单频Ti：蓝宝石激光器泵浦，由倍频全固态Nd: YVO_4激光器泵浦。在20MHz时压缩度为0.2 db，二次谐波（基频）功率为95mW （300mW）。观察到的挤压程度与适用于我们的空腔的理论计算一致，但小于先前报道的值。我们还研究了CuCI和ZnCdSe量子点的光学性质，为未来在压缩光或非经典光的固态光谱中的应用奠定了基础。

We generate amplitude squeezed light tunable around 430nm using a frequency-doubling ring cavity with a KNbO_3 crystal. The cavity is pumped by a single-frequency Ti : sapphire laser, which is pumped by a frequency-doubled all solid-state Nd : YVO_4 laser. The degree of squeezing is O.2dB at 20MHz with second harmonic (fundamental) power of 95mW (300mW). The observed degree of squeezing is consistent with theoretical calculation applicable to our cavity, but smaller than a previously reported value. We also study the optical properties of CuCI and ZnCdSe quantum dots, for future application to solid-state spectroscopy with squeezed or nonclassical light.