Multi-photon processes in alkali metal vapors

Baodong Gai; Shu Hu; Hui Li; Zhe Shi; Xianglong Cai; Jingwei Guo; Yannan Tan; Wanfa Liu; Yuqi Jin; Fengting Sang

doi:10.1117/12.2065367

3 February 2015 Multi-photon processes in alkali metal vapors

Baodong Gai, Shu Hu, Hui Li, Zhe Shi, Xianglong Cai, Jingwei Guo, Yannan Tan, Wanfa Liu, Yuqi Jin, Fengting Sang

Proceedings Volume 9255, XX International Symposium on High-Power Laser Systems and Applications 2014; 92552O (2015) https://doi.org/10.1117/12.2065367
Event: XX International Symposium on High Power Laser Systems and Applications, 2014, Chengdu, China

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 D_5/2, n ² D_3/2 or higher energy levels, then the blue fluorescence of (n+1)² P_3/2,(n+1) ² P_1/2→n ² S_1/2 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.

Citation Download Citation

Baodong Gai, Shu Hu, Hui Li, Zhe Shi, Xianglong Cai, Jingwei Guo, Yannan Tan, Wanfa Liu, Yuqi Jin, and Fengting Sang "Multi-photon processes in alkali metal vapors", Proc. SPIE 9255, XX International Symposium on High-Power Laser Systems and Applications 2014, 92552O (3 February 2015); https://doi.org/10.1117/12.2065367

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