Temperature response of the whispering gallery mode resonances from the green upconversion emission of an Er3+-Yb3+ co-doped microsphere

被引:15
作者
Perez-Rodriguez, C. [1 ,2 ,3 ]
Labrador-Paez, L. [1 ]
Martin, I. R. [1 ,2 ,3 ]
Rios, S. [1 ]
机构
[1] Univ La Laguna, Dept Fis, E-8206 San Cristobal la Laguna, Santa Cruz De T, Spain
[2] Univ La Laguna, MALTA Consolider Team, E-38206 San Cristobal la Laguna, Santa Cruz De T, Spain
[3] Univ La Laguna, IMN, E-38206 San Cristobal la Laguna, Santa Cruz De T, Spain
关键词
optical temperature sensor; whispering gallery mode; Er3+; Yb3+; energy transfer; fluorescence intensity ratio; thermal sensitivity; THERMAL SENSITIVITY; GLASS MICROSPHERES; ER3+; LUMINESCENCE; THERMOMETRY;
D O I
10.1088/1612-2011/12/4/046003
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Whispering gallery mode resonances lying in the green emission from an Er3+-Yb3+ co-doped glass microsphere have been analyzed under different temperatures in the range 290-380 K. Exciting the microsphere at 997 nm results in an upconversion emission with broad bands centered at 530 and 550 nm and overlapped resonances due to the spherical cavity. Both the band shape and the position of the resonances are temperature dependent which allow the correlation of the positions with the temperature inferred by the fluorescence intensity ratio technique. A resonances shift of 4.7 pm K-1 is achieved by laser heating in the power range 50-300 mW. The minimum temperature resolution has been found to be 0.7 K in the fluorescence intensity ratio technique and 100 times smaller for the whispering gallery mode shifts.
引用
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页数:7
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