Compact rubidium-stabilized multi-frequency reference source in the 1.55-μm region.
Compact rubidium-stabilized multi-frequency reference source in the 1.55-μm region.
复制标题
1.55μm 区域的紧凑型铷稳定多频参考源。
作者：
R. Matthey;F. Gruet;S. Schilt;G. Mileti
结合光调制和频率转换技术，展示了一种紧凑且简单的稳频光学频率梳，其跨度在 1.56 μm 波长区域超过 45 nm。它受益于在饱和吸收方案中探测的 780 nm 铷原子跃迁可实现的高频稳定性，该跃迁通过二次谐波生成过程转移到 1.56 μm 光谱区域。光学频率梳由封装在法布里-珀罗腔中的电光调制器产生，该调制器由基频稳定激光器注入。在 1560 nm（铷波长的两倍）和 1557 nm 梳状线的情况下，在 1000 秒到 2 天的时间范围内，频率稳定性优于 2 kHz。
Combining light modulation and frequency conversion techniques, a compact and simple frequency-stabilized optical frequency comb spanning over 45 nm in the 1.56-μm wavelength region is demonstrated. It benefits from the high-frequency stability achievable from rubidium atomic transitions at 780 nm probed in a saturation absorption scheme, which is transferred to the 1.56-μm spectral region via a second-harmonic generation process. The optical frequency comb is generated by an electro-optic modulator enclosed in a Fabry-Perot cavity that is injected by the fundamental frequency stabilized laser. Frequency stability better than 2 kHz has been demonstrated on time scales between 1000 s and 2 days both at 1560 nm, twice the rubidium wavelength, and for a comb line at 1557 nm.