为了高效探测利用三能级A型原子系综Raman集体激发过程产生的非经典关联Stokes和anti~Stokes光子对,必须抑制由写脉冲或读脉冲在原子系综中产生的荧光背景,文章研究了基于铯原子气室中超精细态光抽运的频率选择吸收滤波器.通过理论计算以及实验测量,铯原子气室滤波器在温度为47.15℃时峰值透射率可达74.3%,信号光与其频率相差9.2GHz的荧光背景的透射率抑制比可达26.7dB.同时为了有效避免实验过程中原子气室引起的反射泵浦光对测量结果的影响,尝试采用空心泵浦光束用于超精细态制备,进而对泵浦光采用实心光束和空心光束两种情况下的实验结果进行了对比与分析.
We report experimental investigation of an atomic optical filters by utilizing a laser-pumped cesi- um (Cs) atomic vapor cell,which is based on the demand of the detection of quantum correlated Stokes and anti-Stokes photon pairs in a A-type three-level atomic ensemble, respectively. Firstly, we calculated the probe transmission rate as function of pump intensity and temperature of cesium ensemble in theory, then in experiment,we achieves a peak transmission - 74.3% of probe laser and the distinction ratio between excitation channel and 9.2 GHz (hyperfine splitting in Cs ground state) frequency-detuned signal channel is about - 26.7 dB at 47.15 ℃. In order to avoid reflected pump laser by atomic vapor,we utilized a hol- low pump laser to prepare states and make the contrast of the experiment results with solid pump and hol- low pump.