A long-term frequency-stabilized erbium-fiber-laser-based optical frequency comb with an intra-cavity electro-optic modulator

Author： Yan-Yan Zhang Lu-Lu Yan Wen-Yu Zhao Sen Meng Song-Tao Fan Long Zhang Wen-Ge Guo Shou-Gang Zhang Hai-Feng Jiang

Publisher： IOP Publishing

E-ISSN： 1741-4199|24|6|64209-64213

ISSN： 1674-1056

Source： Chinese Physics B, Vol.24, Iss.6, 2015-06, pp. : 64209-64213

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Abstract

We demonstrate an optical frequency comb based on an erbium-doped-fiber femtosecond laser with the nonlinear polarization evolution scheme. The repetition rate of the laser is about 209 MHz. By controlling an intra-cavity electro-optic modulator and a piezo-transducer, the repetition rate can be stabilized with a high-bandwidth servo in a frequency range of 3 kHz, enabling long-term repetition rate phase-locking. The in-loop frequency stability of repetition rate is about 1.6×10⁻¹³ in an integration time of 1 s, limited by the measurement system; and it is inversely proportional to integration time in the short term. Furthermore, using a common path f– 2f interferometer, the carrier envelope offset frequency of the comb is obtained with a signal-to-noise ratio of 40 dB in a 3-MHz resolution bandwidth. Stabilized carrier envelope offset frequency exhibits a deviation of 0.6 mHz in an integration time of 1 s.