This method achieves 51 dB signal-to-noise ratio in a polarization-maintaining laser system, indicating superior frequency stability.
A femtosecond optical frequency comb (OFC) based on a laser with a nonlinear amplification loop mirror mode-locking mechanism is proposed. The laser adopts a fully polarization-maintaining (PM) structure, which can realize self-starting mode-locking at the center wavelength of 1560.2 nm with 195.65 MHz repetition rate at the pump power of 630 mW, and the frequency stability after phase-locking is 1.95×10 -12 with 1 s averaging time. Through a homemade f -2 f interferometer, the detected free-running f ceo signal exhibits a signal-to-noise ratio (SNR) as high as 51 dB. After phase-locking, f ceo has a frequency stability of 1.17×10 -11 with 1 s averaging time.
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Zong et al. (2025) studied this question.
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