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Frequency-comb-referenced tunable diode laser spectroscopy and laser stabilization applied to laser cooling

机译:频率梳参考的可调谐二极管激光光谱和激光稳定技术应用于激光冷却

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摘要

Laser cooling of trapped atoms and ions in optical clocks demands stable light sources with precisely known absolute frequencies. Since a frequency comb is a vital part of any optical clock, the comb lines can be used for stabilizing tunable, user-friendly diode lasers. Here, a light source for laser cooling of trapped strontium ions is described. The megahertz-level stability and absolute frequency required are realized by stabilizing a distributed-feedback semiconductor laser to a frequency comb. Simple electronics is used to lock and scan the laser across the comb lines, and comb mode number ambiguities are resolved by using a separate, saturated absorption cell that exhibits easily distinguishable hyperfine absorption lines with known frequencies. Due to the simplicity, speed, and wide tuning range it offers, the employed technique could find wider use in precision spectroscopy.
机译:对光钟中被捕获的原子和离子进行激光冷却需要稳定的光源,且必须精确知道绝对频率。由于频率梳是任何光学时钟的重要组成部分,因此梳状线可用于稳定可调谐,用户友好的二极管激光器。这里,描述了用于激光冷却捕获的锶离子的光源。通过将分布式反馈半导体激光器稳定到频率梳,可以实现所需的兆赫兹级稳定性和绝对频率。使用简单的电子设备锁定和扫描整个梳状线上的激光器,并通过使用一个单独的饱和吸收单元来解决梳状模数的歧义,该单元具有易于区分的已知频率的超细吸收线。由于它提供的简单性,速度和宽泛的调谐范围,所采用的技术可以在精密光谱学中找到更广泛的用途。

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