过渡金属离子掺杂的可调频晶体光纤激光器(特邀)  

Transition-metal-ion Doped Tunable Crystalline Fiber Lasers(Invited)

作　　者：李奕勋 郭俊毅[1] 黄升龙 LI Yi-Hsun;KUO Chun-Yi;HUANG Sheng-Lung(Graduate Institute of Photonics and Optoelectronics,Taiwan University,Taipei 10617,China)

机构地区：[1]台湾大学电机系暨光电所,台北10617

出　　处：《光子学报》2020年第11期144-153,共10页Acta Photonica Sinica

摘　　要：宽带可调频激光器除了可用于基础的光谱学研究外,也可应用于各式光通信乃至生物医学成像.过渡金属离子掺杂的固体激光器特别适用于宽频光源的产生,掺钛蓝宝石及掺铬石榴石晶体是目前广为应用的两个例子,将其生长成晶体光纤并以玻璃批覆的激光器在红外光波段展现了优异的特性.掺钛蓝宝石晶体光纤激光器具有高光转换效率、低阀值且调频范围可达180 nm;掺铬石榴石晶体光纤激光器的可调频范围亦达到了170 nm,被激发态吸收所限制.为了纪念激光器发明60周年,本文简要回顾了过渡金属离子掺杂的固体激光器的发展,并介绍了晶体光纤激光器最新的成果.分析了掺钛蓝宝石晶体光纤激光器的调频速率,并与掺铬石榴石晶体光纤的光学特性做了实验与数值模拟的比较.目前逐渐成熟的玻璃批覆晶体光纤激光器,预期在超宽频光通信及细胞级分辨率的光学相干断层扫描术方面有很大的应用潜力.Broadly tunable lasers are useful for basic spectroscopy studies,as well as a wide range of applications from optical communications to biomedical imaging.Transition-metal-ions doped solid-state gain media are eminently suitable for generating broadband emissions.Ti3+:sapphire and Cr4+:YAG crystals are 2 successful examples that are now widely used.Glass-clad Ti3+:sapphire and Cr4+:YAG crystal fibers have shown superior performance for broadly tunable lasers in the near infrared wavelength ranges.The tunable Ti3+:sapphire crystal fiber lasers are efficient,and have demostrated the lowest threshold over a 180 nm tuning range.The Cr4+:YAG crystal fiber laser shows a tuning range of 170 nm,limited by the excited state absorption.To celebrate the 60 thanniversary since laser invention,a brief historical review and the latest developments of the Ti3+:sapphire and Cr4+:YAG crystal fiber lasers are discussed in the manuscript.The tunable Ti3+:sapphire crystal fiber laser’s wavelength sweeping speed is envisioned,and the optical properties are compared with that of the Cr4+:YAG crystal fiber.With welldeveloped crystalline cores and clads for broadly tunable lasers,it is expected that novel applications,such as ultra-broadband optical fiber communications and cellular-resolution optical coherence tomography,could be evolved to meet the high data rate and high image resolution needs in future.

关 键 词：晶体光纤 激光器 掺钛蓝宝石 掺铬石榴石 宽带光通信 生医影像 

分 类 号：TN248.1[电子电信—物理电子学] TN253