Zheng Biao, Deng Lianzhong, Li Jie, Yao Yunhua, Qi Dalong, Shen Yuecheng, Sun Zhenrong, Zhang Shian
State Key Laboratory of Precision Spectroscopy, School of Physics and Electronic Science, East China Normal University, Shanghai 200241, China.
Fujian Key Laboratory of Functional Marine Sensing Materials, College of Material and Chemical Engineering, Minjiang University, Fuzhou 350108, China.
Nanophotonics. 2024 Jun 10;13(19):3709-3715. doi: 10.1515/nanoph-2024-0181. eCollection 2024 Aug.
Femtosecond laser-induced valence state conversion (VC) in solid materials has attracted significant research attention due to its potential application in ultra-high density optical storage, boasting advantages such as ultra-high recording speed, easy reading, and high signal-to-noise ratio. However, identifying appropriate materials and technological solutions conducive to efficient single-laser-shot recording remains a pivotal challenge for practical applications. In this work, we report single femtosecond laser pulse-induced VC in BaFCl: Sm nanocrystals utilizing a 4F-configuration optical imaging system comprising two-dimensional scan galvo mirrors. For the first time, we experimentally reveal the luminescence mechanisms and channels of multiphoton absorption-induced Sm ions under both single and multiple 800 nm fs laser pulses. Leveraging the highly efficient single femtosecond laser pulse induced VC, we demonstrate a prototype optical storage experiment by sweeping the recording laser pulse. Remarkably, a threshold pulse energy as low as ∼100 nJ for effective single-laser-shot recording in BaFCl: Sm nanocrystals is obtained under the current experimental conditions. Our investigations offer profound insights into the physical mechanisms underlying femtosecond laser induced VC in solid materials, thereby promoting the prospects of VC based optical storage toward practical applications.
飞秒激光诱导固体材料中的价态转换（VC）因其在超高密度光存储中的潜在应用而备受研究关注，具有超高记录速度、易读取和高信噪比等优点。然而，确定有利于高效单脉冲记录的合适材料和技术方案仍然是实际应用中的关键挑战。在这项工作中，我们利用包含二维扫描振镜的4F配置光学成像系统，报道了在BaFCl:Sm纳米晶体中单个飞秒激光脉冲诱导的价态转换。首次通过实验揭示了单脉冲和多脉冲800 nm飞秒激光脉冲下多光子吸收诱导Sm离子的发光机制和通道。利用高效的单飞秒激光脉冲诱导的价态转换，我们通过扫描记录激光脉冲展示了一个光存储实验原型。值得注意的是，在当前实验条件下，在BaFCl:Sm纳米晶体中实现有效单脉冲记录的阈值脉冲能量低至约100 nJ。我们的研究为飞秒激光诱导固体材料中价态转换的物理机制提供了深刻见解，从而推动了基于价态转换的光存储走向实际应用的前景。
