TOPIC Blue laser diode-pumped Pr:YLF visible-IR lasers and potential applications 
AREA Microelectronic Technologies & Devices  
SPEAKER Professor Zhiping CAI 
DATE 29 July 2016, Friday 
TIME 10.00am to 11.00am 
VENUE EA-06-05, ECE Seminar Room, Engineering Block EA, NUS 
FEES No Charge 

This talk presents the blue laser diode(LD)-pumped Pr:YLF visible and IR lasers. Pumping with blue light sources, down-conversion blue, green, orange, red and deep red lasers can be realized based on the Pr-doped materials. Compared with visible lasers obtained by nonlinear optical processes (e.g. frequency doubling or mixing), the down-conversion visible lasers don’t rely on the nonlinear optical crystal, and thus have more compact structures, higher conversion efficiencies and better beam quality. In addition, the down-conversion lasers don’t need accurate control of temperature. Pr-doped visible lasers have wide application prospects in the fields of display, underwater communication, medical biology, quantum information science, etc. This talk focuses on the spectroscopic characteristics of the Pr:YLF crystal, and then we realized the semiconductor-pumped Pr:YLF solid- state-lasers emitting in red (~640 nm), green (~523 nm) and orange (~607 nm) as well as the first deep red and NIR lasers. Among these lasers, watt-level visible lasers can be realized pumped by diode laser. Potential applications based on these new kind of lasers are also discussed. 

Prof. Zhiping CAI is the leader of Optoelectronics group, and director of the school professor committee of School of information science & technology, Xiamen University, China. He obtained his Master and PhD degrees in Physics in 1987 and 1989, respectively, from University of Nice, France. His research interests include spectroscopy on rare earth, rare-earth-doped optical fibers and active devices, diode- pumped solid-state lasers. Between 1994 and 1996, then 2000 and 2001, he was a senior visiting scholar in Optronics Laboatory of ENSSAT(Ecole Nationale Supérieure de Sciences Appliquées et de Technologie) in Lannion, France, and the visiting professor in ENS(Ecole Normale Supérieure de Paris), France, and University of Cambridge, UK. He is the head of the Department of Electronic Engineering, Xiamen University, China since 2004. He has published over 200 papers in the refereed journals on the field of fibers and lasers and over 100 papers contributed in national or international conferences. He holds 15 patents. 

Host: Professor Hong Minghui 

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