Low-noise, tunable diode laser for ultra-high-resolution spectroscopy.
Low-noise, tunable diode laser for ultra-high-resolution spectroscopy.
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用于超高分辨率光谱的低噪声、可调谐二极管激光器。
作者：
K. Döringshoff;I. Ernsting;R. Rinkleff;S. Schiller;A. Wicht
我们展示了一个二极管激光装置的优异的光谱特性，它结合了良好的可调性和极好的短期频率稳定性和可控性。它是基于共振光反馈二极管激光器和光栅稳定二极管激光器两个概念的融合。为了表征短期性能，我们击败了两个基本相同的二极管激光器，并发现短期线宽为~11 kHz。这些激光器之间的锁相是实现与伺服带宽小至46千赫，虽然模拟相位检测器被使用，需要子弧度剩余相位误差。尽管相位误差检测范围小，伺服带宽小，但无周期滑移锁相通常可以完成10分钟以上，并且相对于光学参考，光功率基本上包含在小于20 mHz的光谱窗口内。由于优异的性能，这种激光概念非常适合于原子或分子相干实验，这需要不同的激光彼此锁相，并作为光学时钟飞轮的一部分。
We demonstrate the excellent spectral properties of a diode laser setup that combines good tunability with superb short-term frequency stability and controllability. It is based on merging two concepts, the diode laser with resonant optical feedback and the grating stabilized diode laser. To characterize the short-term performance we beat two essentially identical diode lasers and find a short-term linewidth of ~11 kHz. Phase locking between these lasers is achieved with a servo bandwidth as small as 46 kHz, although an analog phase detector is used that requires subradian residual phase error. Despite small phase error detection range and small servo bandwidth, cycle-slip-free phase locking is accomplished for typically many 10 min, and the optical power is essentially contained in a spectral window of less than 20 mHz relative to the optical reference. Due to the excellent performance this laser concept is well suited for atomic or molecular coherence experiments, which require phase locking of different lasers to each other, and as part of a flywheel for optical clocks.