Chaoliang CHENG, Xuling SHEN, Qiang HAO. Study on temperature feedback method of optical frequency comb[J]. Optical Instruments, 2021, 43(1): 76
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In order to solve the problem of long-time operation of a fiber-based frequency comb, the control method of locking the repetition rate (fr) and carrier envelope phase offset frequency (f0) of optical frequency comb is improved. Two thermo-electric coolers (TEC), an upper one and an lower one, are used to control the temperature of frequency comb. By adjusting the TEC temperature, the stability of fr and f0 can be confined in the range of 10 and 600 Hz, respectively. Then, fr and f0 were further stabilized by the feed-back control of the optical path and the pump power, respectively. Finally, in 170-hour operation, the standard deviations of fr and f0 were measured as 0.83 and 280 mHz, respectively. The results show that the method can realize the long-term operation of the optical frequency comb and enhance its adaptability to the environment.