Two-octave frequency combs from an all-silica-fiber implementation

Author:

Zhang Yanyan12,Li Mingkun3,Zhang Pan3,Du Yueqing1,Ma Shibang4,Liu Yuanshan1,Xing SidaORCID,Zhang Shougang3

Affiliation:

1. Northwestern Polytechnical University

2. Research & Development Institute of Northwestern Polytechnical University in Shenzhen

3. National Time Service Center, Chinese Academy of Sciences

4. Xi’an Institute of Applied Optics

Abstract

Mid-infrared frequency-comb spectroscopy enables measurement of molecules at megahertz spectral resolution, sub-hertz frequency accuracy, and microsecond acquisition speed. However, the widespread adoption of this technique has been hindered by the complexity and alignment sensitivity of mid-infrared frequency-comb sources. Leveraging the underexplored mid-infrared window of silica fibers presents a promising approach to address these challenges. In this study, we present the first, to the best of our knowledge, experimental demonstration and quantitative numerical description of mid-infrared frequency-comb generation in silica fibers. Our all-silica-fiber frequency comb spans over two octaves (0.8 μm to 3.4 μm) with a power output of 100 mW in the mid-infrared region. The amplified quantum noise is suppressed using four-cycle (25 fs) driving pulses, with the carrier-envelope offset frequency exhibiting a signal-to-noise ratio of 40 dB and a free-running bandwidth of 90 kHz. Our developed model provides quantitative guidelines for mid-infrared frequency-comb generation in silica fibers, enabling all-fiber frequency-comb spectroscopy in diverse fields such as organic synthesis, pharmacokinetics processes, and environmental monitoring.

Funder

The Science and Technology Commission of Shanghai Municipality

Shenzhen Science and Technology Program

Strategic Priority Research Program of the Chinese Academy of Sciences

Fundamental Research Funds for the Central Universities

Mathematical Basic Science Research Project of Shaanxi

Natural Science Basic Research Program of Shaanxi Province

National Natural Science Foundation of China

Publisher

Optica Publishing Group

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