Laser Cooling of Solids: Vibration-Free Cryocoolers and Athermal Lasers

报告题目：Laser Cooling of Solids: Vibration-Free Cryocoolers and Athermal Lasers

报告人：Prof. Mansoor Sheik-Bahae

主持人：印建平 教授

时间：2018年11月01日（周四）下午14:30

地点：理科大楼A510会议室

主办单位：精密光谱科学与技术国家重点实验室

报告摘要：

Laser cooling of solids (also known as optical refrigeration) has advanced tremendously since its first experimental observation in 1995.Most recently, crystals doped with Yb ions have cooled to an absolute temperature below 90K starting from room temperature, with even lower temperatures on the horizon. Optical refrigeration is currently the only available technique for realizing an all-solid-state cryocooler. In this talk, I will present an overview of the recent advances in laser cooling of rare-earth doped crystals, namely ytterbium (Yb³⁺), thulium (Tm³⁺), and holmium (Ho³⁺)-doped crystals.Most recently, optical refrigeration of a device (LWIR-sensor) to 135K has now been demonstrated using a cryocooler based on Yb:YLF crystal. Extending this concept to radiation-balanced-lasers (RBL) has led to the demonstration of “athermal” rare-earth doped thin-disk lasers. In particular I discuss our recent work on Yb:YAG and Yb:YLF disk RBLs.

报告人简介:

Mansoor Sheik-Bahae is Distinguished Professor of Physics and Astronomy at the University of New Mexico (UNM). He obtained his PhD from SUNY-Buffalo in 1987 and spent seven years at CREOL (University of Central Florida) as a Research Professor.He is currently also the Chair of Optical Science and Engineering (OSE) at UNM.

His research activities and accomplishments have included development of the Z-scan technique, development of an analytical quantum mechanical theory for nonlinear absorption and Kerr effect in solids using a novel formulation nonlinear Kramers-Kronig relationship, ultrafast photonics and diagnostics. His recent focus has been on laser cooling of solids (optical refrigeration), radiation-balanced lasers, and semiconductor photonics.

He is an OSA Fellow (2000), and is the co-recipient of the OSA’s R. W. Wood Prize for his contribution to nonlinear optics.In 2007, Professor Sheik-Bahae was recognized for authoring the most cited paper in the history of IEEE Journal of Quantum Electronics regarding the invention of the Z-scan technique. He has authored 150-200 publicationswith more than 19000 citations to his work.

中文简介：

Mansoor Sheik-Bahae是新墨西哥大学著名的物理学和天文学教授。1987年，他在纽约州立大学布法罗分校获得博士学位，并在克里奥尔大学(中佛罗里达大学)当了7年的研究员。目前担任新墨西哥大学光学科学与工程(OSE)主席。他的研究方向和成果包括Z扫描技术的发展，利用一种新的非线性Kramers-Kronig关系建立了固体中非线性吸收和克尔效应的解析量子力学理论，超快光子学。他最近的工作重点是固体激光冷却(光学制冷)，辐射平衡激光器和半导体光子学。他是OSA研究员(2000)，因为其在非线性光学方面的贡献，与他人共同获得OSA R. W. Wood奖。2007年，Sheik-Bahae教授在IEEE量子电子学期刊上发表了一篇关于z扫描技术的论文，是该期刊被引次数最多的论文。先后发表论文150-200余篇，被引超过19000次。