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Abstract

In this paper, we demonstrate an optical frequency comb (OFC) based on an erbium-doped-fiber femtosecond laser, for the measurement of cavity ring-down spectroscopy (CRDS) with wavelengths of 1064, 1083, 1240, 1380, 1500, 1600, 1750 and 2100 nm. We adopt a multi-branch structure to produce high power at the specific wavelengths to meet the requirement for application in the spectral measurement. The OFC is developed by using a mode-locked fiber ring laser based on the nonlinear amplifying loop mirror mechanism. The laser is self-starting by introducing a nonreciprocal phase bias in the cavity and insensitive to the environmental perturbation. Using the chirped pulse amplification and highly nonlinear fibers, the broad spectra at the specific wavelengths are obtained. By optimizing the parameters of the pulses, the power of per mode at each target wavelength is greater than 300 nW. The f _repis obtained by detecting the output of the femtosecond laser directly, while the f _ceois detected by f-2 finterference. The signal-to-noise ratio of the f _ceois about 35 dB with a 300-kHz resolution bandwidth. By controlling the intra-cavity electro-optic modulator and piezoactuator , the f _repis stabilized with high bandwidth and large range (about megahertz bandwidth and 3 kHz range). The f _ceois stabilized by using feedback to the pump current of the femtosecond laser dynamically. The in-loop frequency instability degree of the f _ceo, evaluated by the Allan deviation, is approximately 4.95 × 10 ^–18/ τ ^1/2at 1 s and integrates down to 10 ^–20level after 2000 s, while that of the f _repis well below 5.85 × 10 ^–13/ τ. The all polarization-maintaining erbium fiber-based femtosecond optical frequency comb with multi-application branches we demonstrate in this paper is efficient and reliable for many other applications including optical frequency metrology and optical atomic clocks.

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Authors and contacts

Corresponding author:Zhang Yan-Yan,zhangyanyan@ntsc.ac.cn; Jiang Hai-Feng,hjiang1@ustc.edu.cn

Funds:Project supported by the National Key R&D Program of China (Grant No. 2020YFA0309801), the Strategic Leader Category B of Chinese Academy of Sciences (Grant No. XDB35030101), and the Natural Science Basic Research Program of Shannxi Province, China (Grant No. 202-JQ-434).

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Vol. 71, Issue 8 - 2022-04-20

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