Frequency locking of a field-widened Michelson interferometer based on optimal multi-harmonics heterodyning.
A general resonant frequency locking scheme for a field-widened Michelson interferometer (FWMI), which is intended as a spectral discriminator in a high-spectral-resolution lidar, is proposed based on optimal multi-harmonics heterodyning. By transferring the energy of a reference laser to multi-harmonics of different orders generated by optimal electro-optic phase modulation, the heterodyne signal of these multi-harmonics through the FWMI can reveal the resonant frequency drift of the interferometer very sensitively within a large frequency range. This approach can overcome the locking difficulty induced by the low finesse of the FWMI, thus contributing to excellent locking accuracy and lock acquisition range without any constraint on the interferometer itself. The theoretical and experimental results are presented to verify the performance of this scheme.
Zhongtao
Z
Cheng
Dong
D
Liu
Yudi
Y
Zhou
Yongying
Y
Yang
Jing
J
Luo
Yupeng
Y
Zhang
Yibing
Y
Shen
Chong
C
Liu
Jian
J
Bai
Kaiwei
K
Wang
Lin
L
Su
Liming
L
Yang