论文标题
在多LAMBDA系统中的三激光相干种群捕获：理论，实验和应用
Three-laser coherent population trapping in a multi-lambda system: theory, experiment and applications
论文作者
论文摘要
我们在多级$^{40} $ ca $^+$ - 键入配置上介绍了相干种群捕获光谱的理论和实验结果，并将第三光束添加到标准的两激光$λ$系统中，以避免不需要的光学泵送。我们表明，额外的激光可以保留黑暗共振的性质或根据其力量引入腐蚀性。实验是使用$ s_ {1/2} -p_ {1/2} -d_ {3/2} $歧管的单个被困的$^{40} $ ca $^+$ ion进行的。从理论上讲，问题是通过Liouvillian的浮标样膨胀来解决的，该扩展正确地预测了所有测量的光谱而无需全职集成。作为多元素技术的第一个应用，我们表明获得的较富含光谱可以用作其中一种梁的矢量偏振仪，从而可以在任何空间方向上测量离子位置的电场。我们还解释了我们的设置如何实现具有可调灵敏度且无激光宽度依赖性的温度计。
We present theoretical and experimental results of coherent population trapping spectra on a multi-level $^{40}$Ca$^+$-type configuration, adding a third beam to the standard two-laser $Λ$ system to avoid undesired optical pumping. We show that the extra laser can preserve the nature of the dark resonances or introduce decoherence depending on its power. Experiments are carried out using a single trapped $^{40}$Ca$^+$ ion in the $S_{1/2}-P_{1/2}-D_{3/2}$ manifold. Theoretically, the problem is solved with a Floquet-like expansion of the Liouvillian that correctly predicts all of the measured spectra without the need of full time integration. As a first application of the multilaser technique, we show that the richer spectra obtained can be used as a vectorial polarimeter of one of the beams, allowing one to measure the electrical field at the ion position in any spatial direction. We also explain how our setup could realize a thermometer with tunable sensitivity and no laser-linewidth dependence.
