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arXiv · 2503.16249

Practical 1-um GHz fiber comb on silica-based platform

Ruoao Yang·Xingang Jin·Ya Wang·Minghe Zhao·Zhendong Chen·Xinpeng Lin·Fei Meng·Duo Pan·Qian Li·Jingbiao Chen·Aimin Wang·Zhigang Zhang
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Abstract

We present a fully stabilized 1-GHz Yb-fiber laser frequency comb built on silica substrates, utilizing "optical cubes" to house all optical components, ensuring long-term stability and practical operation. Both the femtosecond laser and f-to-2f interferometer are constructed to silica bricks, with a compact footprint of 290 mm * 250 mm, and a total weight of 1.8 kg. This system provides a stable repetition rate, offset frequency, and a supercontinuum spanning 460-1560 nm without requiring amplification. The carrier-envelop offset frequency exhibits exceptional in-loop stability, with a fractional frequency instability of 3.07* 10^(-18) at a 1 second averaging time, improving to 2.12*10^(-20) at a 10,000 second, maintaining uninterrupted operation for over 60 hours. This work demonstrates a high-performance GHz fiber-based frequency comb, paving the way for applications beyond laboratory environments, including dual-comb spectroscopy, astronomical spectrograph calibration, and portable optical clocks.

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Ruoao Yang, Xingang Jin, Ya Wang, Minghe Zhao, Zhendong Chen, Xinpeng Lin, Fei Meng, Duo Pan, Qian Li, Jingbiao Chen, Aimin Wang, Zhigang Zhang. 2025-03-20. Practical 1-um GHz fiber comb on silica-based platform. https://arxiv.org/abs/2503.16249

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