High Power Laser Science and Engineering, 2020, 8 (4): 04000e32, Published Online: Oct. 9, 2020   

Mid-infrared optical frequency comb in the 2.7–4.0 μm range via difference frequency generation from a compact laser system Download: 797次

Author Affiliations
1 State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai200062, China
2 Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan030006, China
3 Science and Technology on Electronic Test & Measurement Laboratory, The 41st Research Institute of CETC, Qingdao266000, China
Abstract
We report on the generation of a mid-infrared (mid-IR) frequency comb with a maximum average output power of 250 mW and tunability in the 2.7–4.0 μm region. The approach is based on a single-stage difference frequency generation (DFG) starting from a compact Yb-doped fiber laser system. The repetition rate of the near-infrared (NIR) comb is locked at 75 MHz. The phase noise of the repetition rate in the offset-free mid-IR comb system is measured and analyzed. Except for the intrinsic of NIR comb, environmental noise at low frequency and quantum noise at high frequency from the amplifier chain and nonlinear spectral broadening are the main noise sources of broadening the linewidth of comb teeth, which limits the precision of mid-IR dual-comb spectroscopy.

Lian Zhou, Yang Liu, Gehui Xie, Chenglin Gu, Zejiang Deng, Zhiwei Zhu, Cheng Ouyang, Zhong Zuo, Daping Luo, Bin Wu, Kunfeng Chen, Wenxue Li. Mid-infrared optical frequency comb in the 2.7–4.0 μm range via difference frequency generation from a compact laser system[J]. High Power Laser Science and Engineering, 2020, 8(4): 04000e32.

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