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本文利用周期极化磷酸氧钛钾晶体构成的半整块结构简并光学参量振荡器实验制备了连续变量光通信波段低频压缩态光场。光学参量振荡器的阈值功率为210 mW。当775nm抽运光场功率为130 mW时,在分析频段50kHz~900kHz范围内获得真空压缩态光场。在200kHz分析频率处,压缩态光场的最大压缩度达5.0dB;在最低分析频率50kHz处,压缩态光场的压缩度为2.0dB。该低频压缩态光场可为基于光纤的量子精密测量提供量子光源。
In this paper, a low-frequency compressed optical field with continuous variable optical communication band is prepared by using a half-block degenerate optical parametric oscillator composed of periodically poled potassium titanyl phosphate crystals. The optical parametric oscillator has a threshold power of 210 mW. When the pumping power of 775nm is 130 mW, the vacuum-compressed state light field is obtained in the frequency range of 50kHz ~ 900kHz. At the analysis frequency of 200kHz, the maximum compressibility of the squeezed state optical field reaches 5.0dB; at the lowest analysis frequency of 50kHz, the compressibility of the squeezed state optical field is 2.0dB. This low-frequency, compressed-state light field provides a quantum light source for fiber-based quantum precision measurement.