title: Fourier transform-limited optical frequency-modulated continuous-wave interferometry over several tens of laser coherence lengths.
abstract: We report on a versatile optical frequency-modulated continuous-wave interferometry technique that exploits wideband phase locking for generating highly coherent linear laser frequency chirps. This technique is based on an ultra-short delay-unbalanced interferometer, which leads to a large bandwidth, short lock time, and robust operation even in the absence of any isolation from environmental perturbations. In combination with a digital delay-matched phase error compensation, this permits the achievement of a range window about 60 times larger than the intrinsic laser coherence length with a 1.25 mm Fourier transform-limited spatial resolution. The demonstrated configuration can be easily applied to virtually any semiconductor laser.
authors.forename: Weilin
authors.initials: W
authors.lastname: Xie
authors.forename: Qian
authors.initials: Q
authors.lastname: Zhou
authors.forename: Fabien
authors.initials: F
authors.lastname: Bretenaker
authors.forename: Zongyang
authors.initials: Z
authors.lastname: Xia
authors.forename: Hongxiao
authors.initials: H
authors.lastname: Shi
authors.forename: Jie
authors.initials: J
authors.lastname: Qin
authors.forename: Yi
authors.initials: Y
authors.lastname: Dong
authors.forename: Weisheng
authors.initials: W
authors.lastname: Hu