POPULATION BRANCHING RATIO MODEL——AN EFFECTIVE QUALITIVE ANALYSIS METHOD ABOUT UP-CONVERSION EFFICIENCY | Zendy

Xiaobo Chen | Zendy; MENG CHAO | Zendy; Yafei Wang | Zendy; Hui Ma | Zendy; Meixian Li | Zendy

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POPULATION BRANCHING RATIO MODEL——AN EFFECTIVE QUALITIVE ANALYSIS METHOD ABOUT UP-CONVERSION EFFICIENCY

Author(s) -

Xiaobo Chen,

MENG CHAO,

Yafei Wang,

Hui Ma,

Meixian Li

Publication year - 2000

Publication title -

acta physica sinica

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.199

H-Index - 47

ISSN - 1000-3290

DOI - 10.7498/aps.49.1176

Subject(s) - metastability , branching fraction , excited state , branching (polymer chemistry) , population , materials science , branching process , phonon , relaxation (psychology) , radiative transfer , rate equation , energy conversion efficiency , atomic physics , physics , optics , statistical physics , optoelectronics , condensed matter physics , quantum mechanics , kinetics , sociology , demography , composite material , psychology , social psychology

This article analyze the physics of up-conversion process excited by CW laser. The key metastable state is very important because it initiates the up-conversion process.By analyzing the dynamic process of the key metastable state, a qualitative “population branching ratio β” model is proposed. The physical significance of this method is that it helps to understand the general characteristics of up-conversion.Further analysis indicates, spontaneous emission and non-radiative relaxation Wn do act simultaneously.And the reason why the up-conversion fluorescence of quartz,pentaphosphate non-crystalline is about ten thousand times smaller than that of fluoride glass is that their multi-phonon nonradiative relaxation rate n is much larger than the spontaneous emission rate . We also report the benefit value and the condition WnA of phonon for up-conversion.

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