High Power Laser Science and Engineering, Vol. 8, Issue 4, 04000e32 (2020)
Mid-infrared optical frequency comb in the 2.7–4.0 μm range via difference frequency generation from a compact laser system
Lian Zhou1, Yang Liu1,*, Gehui Xie1, Chenglin Gu1, Zejiang Deng1, Zhiwei Zhu1, Cheng Ouyang1, Zhong Zuo1, Daping Luo1, Bin Wu3, Kunfeng Chen3, and Wenxue Li1,2,*
- 1State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai200062, China
- 2Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan030006, China
- 3Science and Technology on Electronic Test & Measurement Laboratory, The 41st Research Institute of CETC, Qingdao266000, China
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.
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