Optical linear frequency sweep based on a mode-spacing swept comb and multi-loop phase-locking for FMCW interferometry

光学 扫频响应分析 干涉测量 带宽(计算) 频率梳 宽带 连贯性(哲学赌博策略) 梳状发生器 激光器 物理 计算机科学 电信 声学 量子力学
作者
Weilin Xie,Yingxia Meng,Yuxiang Feng,Haijun Zhou,Ling Zhang,Wei Wei,Yi Dong
出处
期刊:Optics Express [The Optical Society]
卷期号:29 (2): 604-604 被引量:6
标识
DOI:10.1364/oe.410405
摘要

We report on the generation of a highly coherent broadband optical linear frequency sweep (LFS) using mode-spacing swept comb and multi-loop composite optical phase-locked loop (OPLL). We exploit a specially designed agile opto-electronic frequency comb as a sweeping reference, whose mode-spacing is capable of arbitrary frequency sweep while preserving a stable phase and power distribution per mode. By locking a continuous-wave (CW) laser to any of its modes using composite OPLL with a large loop bandwidth, it allows the extraction of the optical LFS at high-order modes in a coherent manner with a multiplied sweep range and rate. With such capability, only intermediate frequency LFS with smaller bandwidth is required to yield a broadband LFS while inheriting the coherence and precision from the comb. We achieve optical LFS of 60 GHz at 6 THz/s sweep rate with a nine-folded sweep bandwidth of the driving signal. Fourier transform-limited spatial resolution at more than 80 times of the intrinsic coherence length of the CW laser is demonstrated in an OFMCW interferometry, verifying the high coherence with more than 4 orders of magnitude improvement in spatial resolution. The characteristics in terms of agility, coherence, and precision are discussed together with the potential limitations. The proposed method is capable of generating arbitrary frequency-modulated optical waveforms with a multiplied bandwidth, showing attractive potential in future metrology applications.
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