title: Determining optical path difference with a frequency-modulated continuous-wave method.
abstract: A technique for determining the optical path difference (OPD) between two Raman beams using a frequency-modulated continuous-wave method is investigated. This approach greatly facilitates the measurement and adjustment of the OPD when tuning the OPD is essential to minimize the effects of the diode laser's phase noise on Raman lasers. As a demonstration, the frequencies of the beat note with different OPDs are characterized and analyzed. When the measured beat frequency is 0.367 Hz, the OPD between Raman beams is zero. The phase noise of the Raman laser system after implementation of zeroing of the OPD is also measured.
authors.forename: Ningfang
authors.initials: N
authors.lastname: Song
authors.forename: Xiangxiang
authors.initials: X
authors.lastname: Lu
authors.forename: Wei
authors.initials: W
authors.lastname: Li
authors.forename: Yang
authors.initials: Y
authors.lastname: Li
authors.forename: Yingying
authors.initials: Y
authors.lastname: Wang
authors.forename: Jixun
authors.initials: J
authors.lastname: Liu
authors.forename: Xiaobin
authors.initials: X
authors.lastname: Xu
authors.forename: Xiong
authors.initials: X
authors.lastname: Pan