Ultralow-threshold laser and blue shift cooperative luminescence in a Yb3+ doped silica microsphere

An experimental investigation on ultralow threshold laser and blue shift cooperative luminescence (CL) in a Yb3+ doped silica microsphere (YDSM) with continuous-wave 976 nm laser diode pumping is reported. The experimental results show that the YDSM emits laser oscillation with ultralow threshold of...

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Bibliographic Details
Published inAIP advances Vol. 4; no. 2; pp. 027113 - 027113-6
Main Authors Huang, Yantang, Huang, Yu, Zhang, Peijin, Guo, Changlei
Format Journal Article
LanguageEnglish
Published Melville American Institute of Physics 01.02.2014
AIP Publishing LLC
Subjects
Absorption
Blue shift
Continuous radiation
Emission
Energy levels
Fluorescence
Laser cooling
Laser pumping
Lasers
Luminescence
Morphology
Phonons
Photons
Semiconductor lasers
Silicon dioxide
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Summary:An experimental investigation on ultralow threshold laser and blue shift cooperative luminescence (CL) in a Yb3+ doped silica microsphere (YDSM) with continuous-wave 976 nm laser diode pumping is reported. The experimental results show that the YDSM emits laser oscillation with ultralow threshold of 2.62 μW, and the laser spectrum is modulated by the microsphere morphology characteristics. In addition, blue emission of YDSM is also observed with the increase of pump power, which is supposed to be generated by CL of excited Yb ion-pairs with the absorption of 976 nm photons and Si-O vibration phonons, and the process is explained with an energy level diagram. This property of the blue shift CL with phonons absorption in the Yb3+doped microcavity makes it attractive for the application of laser cooling based on anti-Stokes fluorescence emission, if the Yb3+doped microcavity made from with low phonon energy host materials.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.4866446