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Proceedings Paper

Multi-photon processes in alkali metal vapors
Author(s): Baodong Gai; Shu Hu; Hui Li; Zhe Shi; Xianglong Cai; Jingwei Guo; Yannan Tan; Wanfa Liu; Yuqi Jin; Fengting Sang
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Paper Abstract

Achieving population inversion through multi-photon cascade pumping is almost always difficult, and most laser medium work under 1-photon excitation mechanism. But for alkali atoms such as cesium, relatively large absorption cross sections of several low, cascading energy levels enable them properties such as up conversion. Here we carried out research on two-photon excitation alkali fluorescence. Two photons of near infrared region are used to excite alkali atoms to n 2 D5/2, n 2 D3/2 or higher energy levels, then the blue fluorescence of (n+1) 2 P3/2,(n+1) 2 P1/2→n 2 S1/2 are observed. Different pumping paths are tried and by the recorded spectra, transition routes of cesium are deducted and concluded. Finally the possibility of two-photon style DPALs (diode pumped alkali laser) are discussed, such alkali lasers can give output wavelengths in the shorter end of visual spectroscopy (400-460 nm) and are expected to get application in underwater communication and material laser processing.

Paper Details

Date Published: 3 February 2015
PDF: 7 pages
Proc. SPIE 9255, XX International Symposium on High-Power Laser Systems and Applications 2014, 92552O (3 February 2015); doi: 10.1117/12.2065367
Show Author Affiliations
Baodong Gai, Dalian Institute of Chemical Physics (China)
Shu Hu, Dalian Institute of Chemical Physics (China)
Hui Li, Dalian Institute of Chemical Physics (China)
Zhe Shi, Dalian Institute of Chemical Physics (China)
Xianglong Cai, Dalian Institute of Chemical Physics (China)
Jingwei Guo, Dalian Institute of Chemical Physics (China)
Yannan Tan, Dalian Institute of Chemical Physics (China)
Wanfa Liu, Dalian Institute of Chemical Physics (China)
Yuqi Jin, Dalian Institute of Chemical Physics (China)
Fengting Sang, Dalian Institute of Chemical Physics (China)


Published in SPIE Proceedings Vol. 9255:
XX International Symposium on High-Power Laser Systems and Applications 2014
Chun Tang; Shu Chen; Xiaolin Tang, Editor(s)

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