关键词: Nd:YSAG/
吸收/
发光/
LD抽运固体激光
English Abstract
Spectral and laser properties of Nd:YSAG single crystal
Lu Wan-Cheng1,2,Zhang Qing-Li1,
Luo Jian-Qiao1,
Ding Shou-Jun1,2,
Dou Ren-Qin1,
Peng Fang1,
Zhang Hui-Li1,
Wang Xiao-Fei1,
Sun Gui-Hua1,
Sun Dun-Lu1
1.Key Laboratory of Photonic Devices and Materials of Anhui Province, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;
2.University of Science and Technology of China, Heifei 230026, China
Fund Project:Project supported by the National Natural Science Foundation of China (Grant Nos.51502292,61405206),the National Key RD Program of China (Grant No.2016YFB0402101),the Knowledge Innovation Program of the Chinese Academy of Sciences (Grant Nos.CXJJ-16M251,CXJJ-15M055),and the Anhui Provincial Natural Science Foundation,China (Grant No.608085ME91).Received Date:07 April 2017
Accepted Date:27 April 2017
Published Online:05 August 2017
Abstract:In order to solve the problem of low segregation coefficient of Nd3+ ions in YAG crystal, Sc3+ ions are used to replace some Al3+ ions in YAG, so that the YAG cell becomes bigger, thereby the segregation coefficient of Nd3+ ion increases. In this paper, the spectra and laser characteristics of Nd:YSAG single crystal are studied. The (1.5 at.%) Nd3+:Y3Sc2Al3O12 (YSAG) laser crystal is grown by Czochralski method, and X-ray rocking curve shows that the crystal quality is good. The concentration of ions in Nd:YSAG is measured by an electronic probe. The segregation coefficient of Nd3+ ion is calculated to be 0.35, which is approximately twice as much as that of Nd3+ in YAG. The absorption and emission spectra are measured, which indicates that it can be pumped by an 808 nm-laser diode (LD). The strongest emission from the transition 4F3/24I11/2 of Nd:YSAG peaks at 1059 nm with an emission cross section of 1.0310-19 cm2, and the lifetime of 4F3/2 is about 253 s, which indicates that Nd:YSAG has roughly an efficiency equal to that of Nd:YAG, but the laser upper level lifetime is longer than that of Nd:YAG, which is more favorable for Q-switched laser operation. The 808 nm-LD is used to pump Nd:YSAG rod of 2 mm2 mm6 mm, the laser operation with a threshold of 0.85 W and a maximum output power of 1.1 W is realized:the laser slope efficiency is 21.1%, and the optical conversion efficiency is 18.3%. All of the above results show that Nd:YSAG single crystal is a good solid state laser material, which is more favorable for Q-switched laser operation.
Keywords: Nd:YSAG/
absorption/
fluorescence/
laser diode pumped solid-state laser
