DECAY PROCESSES OF HIGH FREQUENCY NONEQUILIBRIUM PHONONS IN PRASEODYMIUM DOPED LASER CRYSTALS

Wang Xiaojun; Dennis W M; Yen W M

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DECAY PROCESSES OF HIGH FREQUENCY NONEQUILIBRIUM PHONONS IN PRASEODYMIUM DOPED LASER CRYSTALS

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- DECAY PROCESSES OF HIGH FREQUENCY NONEQUILIBRIUM PHONONS IN PRASEODYMIUM DOPED LASER CRYSTALS
- Chinese Journal of Luminescence Vol. 20, Issue 2, Pages: 134-142(1999)
- 作者机构：
  
  1. Department of Physics & Astronomy, Georgia Southern University, Statesboro GA,USA,30460
  2. Department of Physics and Astronomy, The University of Georgia,GA Athens,USA,30502
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：01 August 1998，
  
  Published：30 May 1999
- 稿件说明：
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Wang Xiaojun, Dennis W M, Yen W M. DECAY PROCESSES OF HIGH-FREQUENCY NONEQUILIBRIUM PHONONS IN PRASEODYMIUM-DOPED LASER CRYSTALS[J]. 发光学报, 1999,20(2): 134-142

Wang Xiaojun, Dennis W M, Yen W M. DECAY PROCESSES OF HIGH FREQUENCY NONEQUILIBRIUM PHONONS IN PRASEODYMIUM DOPED LASER CRYSTALS[J]. Chinese Journal of Luminescence, 1999,20(2): 134-142
Wang Xiaojun, Dennis W M, Yen W M. DECAY PROCESSES OF HIGH-FREQUENCY NONEQUILIBRIUM PHONONS IN PRASEODYMIUM-DOPED LASER CRYSTALS[J]. 发光学报, 1999,20(2): 134-142 DOI：

Wang Xiaojun, Dennis W M, Yen W M. DECAY PROCESSES OF HIGH FREQUENCY NONEQUILIBRIUM PHONONS IN PRASEODYMIUM DOPED LASER CRYSTALS[J]. Chinese Journal of Luminescence, 1999,20(2): 134-142 DOI：

摘要

We have investigated the decay of nonequilibrium phonons in YAG:Pr

(1.0at.%) and LiYF 4:Pr

(1.0at.%) at a temperature of 9K. Nonequilibrium phonon populations at 43.0

51.9

66.0 and 113cm

-1

are generated monochromatically with a high power pulsed far-infrared laser using defect-induced one-phonon absorption

and their temporal and spectra evolution determined using a time-resolved vibronic sideband spectrometer. We find that two decay mechanisms dominate the nonequilibrium phonon relaxation in the crystals: anharmonic decay via three-phonon-interactions and two-phonon-one-electron inelastic scattering processes. In LiYF

system

we observe the broad band distribution that results from the anharmonic decay of the initial monochromatic phonon population. In YAG system

the latter mechanism leads to the evolution of a highly peaked phonon distribution that persists for several phonon generations.

Abstract

We have investigated the decay of nonequilibrium phonons in YAG:Pr

(1.0at.%) and LiYF 4:Pr

(1.0at.%) at a temperature of 9K. Nonequilibrium phonon populations at 43.0

51.9

66.0 and 113cm

-1

are generated monochromatically with a high power pulsed far-infrared laser using defect-induced one-phonon absorption

system

we observe the broad band distribution that results from the anharmonic decay of the initial monochromatic phonon population. In YAG system

the latter mechanism leads to the evolution of a highly peaked phonon distribution that persists for several phonon generations.

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Related Institution

Institute of Opto-Electronic Materials and Technology, South China Normal University

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Key Laboratory of Excited State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 3888 Eastern South Lake Road

Graduate School of Chinese Academy of Sciences

Department of Physics, Georgia Southern University, Statesboro, Georgia 30460, USA

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