中国物理B ›› 1996, Vol. 5 ›› Issue (8): 601-608.doi: 10.1088/1004-423X/5/8/005

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COHERENT OPTICAL PHONON EXCITATION BY FEMTOSECOND LASER PULSE IN YBa2Cu3O7-δ THIN FILMS

皮飞鹏1, 莫党2, 林位株3   

  1. (1)Department of Physics, Guangzhou Teachers College, Guangzhou 510400, China; (2)Department of Physics, Zhongshan University, Guangzhou 510275, China; (3)Department of Physics, Zhongshan University, Guangzhou 510275, China;State Key Laboratory of Ultrafast Laser Spectroscopy, Zhongshan University, Guangzhou 510275, China
  • 收稿日期:1995-06-28 出版日期:1996-08-20 发布日期:1996-08-20

COHERENT OPTICAL PHONON EXCITATION BY FEMTOSECOND LASER PULSE IN YBa2Cu3O7-$\delta$ THIN FILMS

PI FEI-PENG (皮飞鹏)a, LIN WEI-ZHU (林位株)bc, MO DANG (莫党)b   

  1. a Department of Physics, Guangzhou Teachers College, Guangzhou 510400, China; b Department of Physics, Zhongshan University, Guangzhou 510275, China; c State Key Laboratory of Ultrafast Laser Spectroscopy, Zhongshan University, Guangzhou 510275, China
  • Received:1995-06-28 Online:1996-08-20 Published:1996-08-20

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摘要： With a correlation of nonequilibrium carriers relaxation and coherent phonons displacive excitation, the coherent optical phonon oscillations in YBa2Cu3O7-δ thin films excited by femtosecond laser pulse are simulated theoretically. It is revealed that as the oxygen concentration decreases, the coherent phonon oscillations become easier to be observed due to the decrease of the local coupling between the carriers and the lattice vibrations in the CuO2 plane.

Abstract: With a correlation of nonequilibrium carriers relaxation and coherent phonons displacive excitation, the coherent optical phonon oscillations in YBa2Cu3O7-$\delta$ thin films excited by femtosecond laser pulse are simulated theoretically. It is revealed that as the oxygen concentration decreases, the coherent phonon oscillations become easier to be observed due to the decrease of the local coupling between the carriers and the lattice vibrations in the CuO2 plane.

中图分类号:  (Phonons)

  • 74.25.Kc
74.25.Gz (Optical properties)