Correction of laser sweeping nonlinearities using ultralow-loss on-chip 7 m spiral resonators  

作　　者：OSAMA TERRA WARREN JIN HUSSEIN KOTB JOEL GUO JOHN E.BOWERS 

机构地区：[1]Department of Electrical and Computer Engineering,University of California,Santa Barbara,California 93106,USA [2]Primary Length and Laser Technology Laboratory,National Institute of Standards,Giza,Egypt [3]Anello Photonics,Santa Clara,California 95054,USA [4]Department of Electronics and Electrical Communication Engineering,Faculty of Engineering,Ain Shams University,Cairo,Egypt

出　　处：《Photonics Research》2025年第1期40-48,共9页光子学研究(英文版)

基　　金：DARPA MTO under a Gryphon grant;Anello Photonics.

摘　　要：Swept laser interferometry is an extremely powerful solution embedded in several recent technologies such as absolute distance measurement,light detection and ranging(LiDAR),optical frequency domain reflectometry,optical coherence tomography,microresonator characterization,and gas spectroscopy.Nonlinearity in the optical frequency sweeping of tunable lasers is a fatal drawback in gaining the expected outcome from these technologies.Here,we introduce an on-chip,millimeter-scale,7 m spiral resonator that is made of ultralow-loss Si_(3)N_(4)to act as a frequency ruler for correction of the tunable lasers sweeping nonlinearities.The sharp 2 MHz frequency lines of the 8.5×10^(7)high-quality factor resonator and the narrow-spaced 25.566 MHz frequency ticks of the 7 m spiral allow unprecedented precision for an on-chip solution to correct the laser sweeping nonlinearity.Accurate measurements of the ruler’s frequency spacing,linewidth,and temperature and wavelength sensitivities of the frequency ticks are performed here to demonstrate the quality of the frequency ruler.In addition,the spiral resonator is implemented in an frequency-modulated continuous-wave LiDAR experiment to demonstrate a potential application of the proposed on-chip frequency ruler.

关 键 词：resonator LASER MILLIMETER 

分 类 号：TN249[电子电信—物理电子学] O436.1[机械工程—光学工程]