论文标题
rubidium的单光子级子多普勒泵探针光谱
Single-photon-level sub-Doppler pump-probe spectroscopy of rubidium
论文作者
论文摘要
我们提出并演示了Rubidium吸收的泵探针光谱，该光谱揭示了$^{5} $ s $ _ {1/2} \ leftrightArrow $ $^{5} $ P $ _ {3/2} $（d2）$（d2）$（d2）$（d2）$^{1/2} \ leftrightArrow $^{5} \ leftrightArrow $^{5} \ leftrightArrow $^{5} $（d2）$（d2）过渡。反向传播泵和探针激光器在频率上是独立调谐的，探针在单光子级处工作。扫描激光频率测量的二维光谱显示荧光，多普勒避开吸收倾角和子多普勒特征。泵和探针激光器之间的失谐允许室温蒸气中所有原子速度的多普勒移位补偿，这意味着我们观察到了梁中所有原子的子多普勒特征。我们详细介绍了融合荧光，饱和效应和光学泵送的系统的理论模型，并将其与测量的光谱进行比较，发现平均绝对百分比误差为4.17 \％。将来，这种技术可以有助于激光的频率稳定，并且单光子级探针可以用单个光子源代替。
We propose and demonstrate pump-probe spectroscopy of rubidium absorption which reveals the sub-Doppler hyperfine structure of the $^{5}$S$_{1/2} \leftrightarrow$ $^{5}$P$_{3/2}$ (D2) transitions. The counter propagating pump and probe lasers are independently tunable in frequency, with the probe operating at the single-photon-level. The two-dimensional spectrum measured as the laser frequencies are scanned shows fluorescence, Doppler-broadened absorption dips and sub-Doppler features. The detuning between the pump and probe lasers allows compensation of the Doppler shift for all atomic velocities in the room temperature vapor, meaning we observe sub-Doppler features for all atoms in the beam. We detail a theoretical model of the system which incorporates fluorescence, saturation effects and optical pumping and compare this with the measured spectrum, finding a mean absolute percentage error of 4.17\%. In the future this technique could assist in frequency stabilization of lasers, and the single-photon-level probe could be replaced by a single photon source.
