基于压电陶瓷传感器以及多级温度反馈的小型化自适应双光梳

In this paper, we developed a miniaturized adaptive dual-comb system. Two erbium-doped fiber oscillators with repetition frequency of about 77.2 MHz and frequency difference of 180 Hz were used as the seed source of the dual-comb. Their output pulses were injected into a highly nonlinear fiber for spectral broadening after passing through two-stage erbium-doped fiber amplifiers. As a result, the spectral coverage range was extended to 12001700 nm. Furthermore, we applied two continuous lasers centered at 1550 nm and 1564 nm and two fiber oscillators to beating and thus obtained four beat signals. This aimed to compensate for the instability of differences in carrier-envelope offset frequency and repetition frequency. Piezoelectric transducer voltage feedback and multi-stage temperature feedback were introduced to the above signals to achieve their stability. As such, the standard deviation of the beat signals was 0.19 MHz. The developed adaptive dual-comb system has a size of 80 cm×67 cm×8 cm and overall weight less than 30 kg, which provides a solution for a wider range of outdoor applications.