Valence state manipulation of Sm3+ ions via a phase-shaped femtosecond laser field
The ability to manipulate the valence state conversion of rare-earth ions is crucial for their applications in color displays, optoelectronic devices, laser sources, and optical memory. The conventional femtosecond laser pulse has been shown to be a well-established tool for realizing the valence state conversion of rare-earth ions, although the valence state conversion efficiency is relatively low. Here, we first propose a femtosecond laser pulse shaping technique for improving the valence state conversion efficiency of rare-earth ions. Our experimental results demonstrate that the photoreduction efficiency from Sm3+ to Sm2+ in Sm3+-doped sodium aluminoborate glass using a π phase step modulation can be comparable to that using a transform-limited femtosecond laser field, while the peak laser intensity is decreased by about 63%, which is very beneficial for improving the valence state conversion efficiency under the laser-induced damage threshold of the glass sample. Furthermore, we also theoretically develop a (2+1) resonance-mediated three-photon absorption model to explain the modulation of the photoreduction efficiency from Sm3+ to Sm2+ under the π-shaped femtosecond laser field.
基金项目：National Natural Science Foundation of China (NSFC)10.13039/501100001809 (11474096, 11727810, 11774094, 61720106009); Science and Technology Commission of Shanghai Municipality (STCSM)10.13039/501100003399, China (16520721200, 17ZR146900).
Yunhua Yao：State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
Lianzhong Deng：State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
Wenjing Cheng：School of Electronic & Electrical Engineering, Shangqiu Normal University, Shangqiu 476000, China
Jianping Li：State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
Tianqing Jia：State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
Jianrong Qiu：State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, China
Zhenrong Sun：State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
Shian Zhang：State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, ChinaCollaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, Chinae-mail: email@example.com
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Ye Zheng, Yunhua Yao, Lianzhong Deng, Wenjing Cheng, Jianping Li, Tianqing Jia, Jianrong Qiu, Zhenrong Sun, and Shian Zhang, "Valence state manipulation of Sm3+ ions via a phase-shaped femtosecond laser field," Photonics Research 6(2), 144-148 (2018)