Nonlinear negative transmittance at a CW 980-nm laser diodes pumping in Yb³⁺:CaF₂ nanocrystals-embedded glass ceramics

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• 作者：Zhi Chen ; Sinan Lai ; Hang Zhang ; Hong Jia ; Ting Wang ; Qiuqun Chen ; Guoping Dong ; Chun Jiang and Jianrong Qiu
• 刊名：Journal of the American Ceramic Society
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：100
• 期：2
• 页码：612-619
• 全文大小：1856K
• ISSN：1551-2916

文摘

Cooperative upconversion luminescence (CUCL) occurs in spectral regions in which single ions do not have energy levels. However, all results reported so far are concentrated on luminescence properties from Yb³⁺ ions-doped various hosts. Here, we report the observation of nonlinear negative transmittance (NNT) at continuous-wavelength (CW) 980-nm laser diodes (LDs) pumping in silicate oxyfluoride glass ceramics (GCs)-containing CaF₂:Yb³⁺ nanocrystals. The unique optical nonlinearity is analyzed based on energy-level transitions, dynamic evolution, rate equation, and power transmission equation, which can be explained as the cooperative optical absorption for the intense CUCL of Yb³⁺ ions. The NNT in the CaF₂:Yb³⁺ nanocrystals-embedded GCs can be tailored with the power of a CW 980-nm LDs, which possesses potential for the development of future optical limiters and switches.