Frequency-comb-linearized, widely tunable lasers for coherent ranging  

作　　者：BAOQI SHI YI-HAN LUO WEI SUN YUE HU JINBAO LONG XUE BAI ANTING WANG JUNQIU LIU 

机构地区：[1]Department of Optics and Optical Engineering,University of Science and Technology of China,Hefei 230026,China [2]International Quantum Academy,Shenzhen 518048,China [3]Shenzhen Institute for Quantum Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,China [4]Hefei National Laboratory,University of Science and Technology of China,Hefei 230088,China

出　　处：《Photonics Research》2024年第4期663-681,共19页光子学研究（英文版）

基　　金：China Postdoctoral Science Foundation(2022M721482);Guangdong Provincial Key Laboratory(2019B121203002);Shenzhen-Hong Kong Cooperation Zone for Technology and Innovation(HZQB-KCZYB2020050);National Natural Science Foundation of China(12261131503)。

摘　　要：Tunable lasers,with the ability to continuously vary their emission wavelengths,have found widespread applications across various fields such as biomedical imaging,coherent ranging,optical communications,and spectroscopy.In these applications,a wide chirp range is advantageous for large spectral coverage and high frequency resolution.Besides,the frequency accuracy and precision also depend critically on the chirp linearity of the laser.While extensive efforts have been made on the development of many kinds of frequency-agile,widely tunable,narrow-linewidth lasers,wideband yet precise methods to characterize and linearize laser chirp dynamics are also demanded.Here we present an approach to characterize laser chirp dynamics using an optical frequency comb.The instantaneous laser frequency is tracked over terahertz bandwidth at 1 MHz intervals.Using this approach we calibrate the chirp performance of 12 tunable lasers from Toptica,Santec,New Focus,EXFO,and NKT that are commonly used in fiber optics and integrated photonics.In addition,with acquired knowledge of laser chirp dynamics,we demonstrate a simple frequency-linearization scheme that enables coherent ranging without any optical or electronic linearization unit.Our approach not only presents novel wideband,highresolution laser spectroscopy,but is also critical for sensing applications with ever-increasing requirements on performance.

关 键 词：TUNABLE FOCUS COHERENT 

分 类 号：TN248[电子电信—物理电子学]