کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1493214 | 1510774 | 2016 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The role of two-step excitation processes in laser cooling experiments: CaF2:Eu2+
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
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چکیده انگلیسی
The fluorescence of CaF2 single-crystals containing Eu2+ ions was studied under the excitation in the long-wavelength tail of the absorption spectrum which is due to electric dipole allowed transitions (“laser cooling regime”). Though no actual cooling was detected, spectra with a dominant anti-Stokes component were observed which demonstrate the possibility to employ electron-phonon bands of Eu2+ f-d transitions for optical refrigeration. The absence of observable optical refrigeration is ascribed to Eu2+ two-step photoionization processes that are responsible for the excited state absorption. The role of two-step excitation of impurity centers (excited state absorption) in laser cooling experiments is discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optical Materials - Volume 60, October 2016, Pages 240-243
Journal: Optical Materials - Volume 60, October 2016, Pages 240-243
نویسندگان
S.P. Feofilov, A.B. Kulinkin, V.A. Konyushkin, A.N. Nakladov,