High power optical frequency comb with 10-19 frequency instability
Posted on 2023-09-18 - 18:37
Optical frequency combs with more than 10 W have paved the way for extreme ultraviolet combs generation by interaction with inert gases, leading to extreme nonlinear spectroscopy and the ultraviolet nuclear clock. Recently, the demand for an ultra-long-distance time and frequency space transfer via optical dual-comb proposes a new challenge for high power frequency comb in respect of power scaling and optical frequency stability. Here we present a frequency comb based on fiber chirped pulse amplification (CPA), which can offer more than 20 W output power. We further characterize the amplifier branch noise contribution by comparing two methods of locking to an optical reference and measure the out-of-loop frequency instability by heterodyning two identical high-power combs. Thanks to the low noise CPA, reasonable locking method, and optical path-controlled amplifiers, the out-of-loop beat note between two combs demonstrates the unprecedented frequency stability of 4.35×10-17 at 1s and 6.54×10-19 at 1000 s.
CITE THIS COLLECTION
Shao, Xiaodong; Han, Hainian; Wang, Huibo; Ma, Junyi; Hu, Yue; Li, Chengzhi; et al. (2023). High power optical frequency comb with 10-19 frequency instability. Optica Publishing Group. Collection. https://doi.org/10.6084/m9.figshare.c.6792285.v2
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