Anisotropic stimulated emission cross-section measurement in Nd:YVO_4  

作　　者：Rui Guo Yijie Shen Yuan Meng Mali Gong 郭瑞;申艺杰;孟鸢;巩马理(Department of Precision Instrument State Key Laboratory of Precision Measurement and Instruments Tsinghua University;Department of Precision Instrument State Key Laboratory of Tribology Tsinghua University)

机构地区：[1]Department of Precision Instrument State Key Laboratory of Precision Measurement and Instruments Tsinghua University [2]Department of Precision Instrument State Key Laboratory of Tribology Tsinghua University

出　　处：《Chinese Physics B》2019年第4期202-206,共5页中国物理B（英文版）

摘　　要：As a crucial parameter in the design and analysis of laser performances, stimulated emission(SE) cross-section is currently considered to be dependent on several factors, such as temperatures and eigen-polarizations for anisotropic crystals. In contrast with these factors, impact of propagating directions upon SE cross-section has garnered less attention.In this paper, to investigate the SE cross-section in arbitrary propagating directions, fluorescence spectra for the transition ~4F_(3/2)→~4I_(11/2) in Nd:YVO_4 are measured in different propagating directions. Based on Fuchtbauer–Ladenburg equation model, the propagating direction-dependent SE cross-section spectra in Nd:YVO_4 are obtained for the first time, to our best knowledge. A novel concept of anisotropic SE cross-section is proposed to interpret the propagating direction-dependent effect. The experiment results reveal that for an arbitrary propagating direction the SE cross-section of e light around 1064 nm can be expressed as a superposition from two principle axial propagating directions with a weight of plane projection.As a crucial parameter in the design and analysis of laser performances, stimulated emission(SE) cross-section is currently considered to be dependent on several factors, such as temperatures and eigen-polarizations for anisotropic crystals. In contrast with these factors, impact of propagating directions upon SE cross-section has garnered less attention.In this paper, to investigate the SE cross-section in arbitrary propagating directions, fluorescence spectra for the transition ~4F_(3/2)→~4I_(11/2) in Nd:YVO_4 are measured in different propagating directions. Based on Fuchtbauer–Ladenburg equation model, the propagating direction-dependent SE cross-section spectra in Nd:YVO_4 are obtained for the first time, to our best knowledge. A novel concept of anisotropic SE cross-section is proposed to interpret the propagating direction-dependent effect. The experiment results reveal that for an arbitrary propagating direction the SE cross-section of e light around 1064 nm can be expressed as a superposition from two principle axial propagating directions with a weight of plane projection.

关 键 词：SOLID-STATE LASERS stimulated emission CROSS-SECTION ND:YVO4 laser spectroscopy 

分 类 号：O4[理学—物理]