Ultra-cold atoms in an optical cavity: two-mode laser locking to the cavity avoiding radiation pressure
Ultra-cold atoms in an optical cavity: two-mode laser locking to the cavity avoiding radiation pressure
复制标题
光学腔中的超冷原子：双模激光锁定腔避免辐射压力
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
P. Courteille
中科院分区：
文献类型：
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作者：
S. Bux;G. Krenz;S. Slama;C. Zimmermann;P. Courteille
超冷原子云与光学腔光场的结合为新型激光冷却的开发和研究协同现象提供了强大的模型系统。这些实验关键取决于入射泵浦激光器相对于腔谐振的精确调谐。在这里，我们提出了一种基于双模激光光谱仪的简单可靠的实验调谐方案。该方案使用第一台激光器来探测腔体的高阶横向模式，该模式在腔体光轴附近具有最小强度，其中原子被磁阱限制。通过这种方式，可以在不将原子暴露于不需要的辐射压力的情况下观察空腔共振。第二个激光器与第一个激光器锁相并调谐到接近基本腔模式，驱动相干原子场动力学。
The combination of ultra-cold atomic clouds with the light fields of optical cavities provides a powerful model system for the development of new types of laser cooling and for studying cooperative phenomena. These experiments critically depend on the precise tuning of an incident pump laser with respect to a cavity resonance. Here, we present a simple and reliable experimental tuning scheme based on a two-mode laser spectrometer. The scheme uses a first laser for probing higher-order transversal modes of the cavity having an intensity minimum near the cavity’s optical axis, where the atoms are confined by a magnetic trap. In this way the cavity resonance is observed without exposing the atoms to unwanted radiation pressure. A second laser, which is phase locked to the first and tuned close to a fundamental cavity mode, drives the coherent atom-field dynamics.