面向低噪时钟的全集成克尔透镜锁模陶瓷激光器(特邀)  

Fully Integrated Kerr-lens Mode-locked Ceramic Laser for Low-noise Clock(Invited)

作　　者：张彤 史巧雅 冯野[1,2] 王晨 王屹山[1,2] 马彩文 ZHANG Tong;SHI Qiaoya;FENG Ye;WANG Chen;WANG Yishan;MA Caiwen(Xi′an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences,Xi′an 710119,China;University of Chinese Academy of Sciences,Beijing 100094,China)

机构地区：[1]中国科学院西安光学精密机械研究所,西安710119 [2]中国科学院大学,北京100094

出　　处：《光子学报》2025年第2期32-38,共7页Acta Photonica Sinica

基　　金：国家重点研究发展计划(No.2022YFC2203804);国家自然科学基金(No.62435014)。

摘　　要：基于耐辐照的Yb∶Y_(2)O_(3)陶瓷完成了面向低噪时钟的全集成克尔透镜锁模陶瓷激光器的探索。激光器的中心波长位于1076.5 nm,光谱宽度为8.58 nm,正常工作状态下,仅需约4 W的功耗即可维持稳定的锁模状态。泵浦结构的优化促使全部光学元件集成于面积为34 mm×78 mm的氮化铝基板上。紧凑的光学结构便于激光器的温度控制,在温控模块的辅助下,激光器连续自由运行2 h的相对功率稳定性可以抑制在0.4%以内。小体积,低噪声,低功耗,使用寿命长的特性使集成化陶瓷激光器有望成为未来引力波探测的理想工具。Detecting Gravitational Waves(GWs)in the 0.1 mHz to 1 Hz range is a crucial step in exploring the longstanding astrophysical mysteries surrounding the coevolution of supermassive black holes at galactic centers and their host galaxies.It is estimated that GWs can only induce spatial changes on the order of 10^(-21),which poses a significant challenge for ground-based observatories due to spatial constraints and interference from the ground and atmosphere.Fortunately,space-based GWs observatories can offer promising solutions,where signals are expected to be larger in number and characterized by larger amplitudes.Notable examples include the Laser Interferometer Space Antenna(LISA),Tianqin,and Taiji.All these missions deploy three synchronized satellites in a triangular configuration,separated by arm lengths of 10^(8)~10^(9)meters,forming a colossal interferometer in space.Each satellite houses two freefalling test masses,whose relative displacements are monitored via laser interferometry.By analyzing the movement between these masses with ultra-stable clocks,scientists aim to extract faint GWs buried in noise.The detection of GWs necessitates displacement measurements with an extraordinary precision of tens of picometers.Achieving such precision demands the suppression of noise sources,particularly laser frequency fluctuations,to an extraordinary degree.In addition to optimizing the structure of the interferometer using Pound-Drever-Hall(PDH)frequency stabilization and arm-locking techniques,researchers are now using Time-Delay Interferometer(TDI)techniques to improve the accuracy of gravitational wave detection.TDI represents a computational tour de force:it processes phase data collected from satellites at varying light-travel times and combines them algorithmically to cancel laser frequency fluctuations.For example,differential measurements between satellites are delayed and summed to nullify phase drifts caused by imperfect laser coherence.This approach effectively mitigates noise while preserving GW signatur

关 键 词：集成光学 固态 超快激光器 克尔效应 天文光学 

分 类 号：TN248.1[电子电信—物理电子学]