Abstract

Laser ranging with frequency comb intermode beats (IMBs) has been suffering from random phase drifts (RPDs) for two decades. In this study, we reveal the influence of signal transmission path on the RPDs and propose a real-time suppression method using two IMBs of similar frequencies from different combs. As the two IMBs obtain similar RPDs during their transmission through same signal paths, the RPD of the original probing signal IMB is suppressed by deducting the RPD of the newly added local IMB in real time. In our experiments, a real-time suppression of RPDs is achieved using IMBs of 1001 and 1000 MHz. For the sampling time of 100 s, the effect of 19-fold suppression has been achieved. The proposed method provides a new solution for the long-standing phase drift problem in laser ranging with comb IMBs.

© 2023 Chinese Laser Press

Intermode beat stabilized laser with frequency pulling

Shuko Yokoyama, Tsutomu Araki, and Norihito Suzuki
Appl. Opt. 33(3) 358-363 (1994)

A distance meter using a terahertz intermode beat in an optical frequency comb

Shuko Yokoyama, Toshiyuki Yokoyama, Yuki Hagihara, Tsutomu Araki, and Takeshi Yasui
Opt. Express 17(20) 17324-17337 (2009)

Frequency-modulated continuous-wave laser ranging using low-duty-cycle signals for the applications of real-time super-resolved ranging

Zhongyang Xu, Xiuyuan Sun, Fengxi Yu, Kai Chen, and Shilong Pan
Opt. Lett. 46(2) 258-261 (2021)

Few-femtosecond-resolution characterization and suppression of excess timing jitter and drift in indoor atmospheric frequency comb transfer

Jinho Kang, Junho Shin, Chur Kim, Kwangyun Jung, Suhyeon Park, and Jungwon Kim
Opt. Express 22(21) 26023-26031 (2014)

High-speed high-resolution heterodyne interferometer using a laser with low beat frequency

Xiaofei Diao, Pengcheng Hu, Zi Xue, and Yanhui Kang
Appl. Opt. 55(1) 110-116 (2016)