Strain-Dependent Fluorescence Spectroscopy of Nanocrystals and Nanoclusters in Cr:YAG Crystalline-Core Fibers and Its Impact on Lasing Behavior

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• 作者：Chien-Chih Lai ; Pochi Yeh ; Shih-Chang Wang ; Dong-Yo Jheng ; Cheng-Nan Tsai ; Sheng-Lung Huang
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：December 13, 2012
• 年：2012
• 卷：116
• 期：49
• 页码：26052-26059
• 全文大小：587K
• 年卷期：v.116,no.49(December 13, 2012)
• ISSN：1932-7455

文摘

We report the results of our experimental investigation on the strain field distribution in Cr:Y₃Al₅O₁₂ (Cr:YAG) double-clad crystal fiber (DCF) via spatially resolved near-field imaging in the visible (Cr³⁺) and near-infrared (Cr⁴⁺) spectral regions. The efficient and low-threshold lasing from Cr⁴⁺:YAG DCF is well-described by a minimization of the localized strain field in the core due to the thermal expansion coefficient mismatch between YAG crystalline core and polycrystalline inner cladding (mixture of 纬-Al₂O₃ nanocrystal and Y₂O₃鈥揂l₂O₃鈥揝iO₂ glass). The Cr⁴⁺ fluorescence is found to be at a maximum for the DCF with a core diameter around 20 渭m where the strain field in the Cr⁴⁺:YAG DCF laser is near zero. The results are presented and discussed.