Share Email Print

Proceedings Paper

Femtosecond optical nonlinearities in YBa2Cu3O7-x
Author(s): Ting Gong; Y. Kostoulas; Li Xing Zheng; W. Xiong; Witold Kula; Roman Sobolewski; Philippe M. Fauchet
Format Member Price Non-Member Price
PDF $17.00 $21.00

Paper Abstract

We have performed a series of femtosecond reflectivity experiments on various YBa2Cu3O7-x (YBCO) thin films at temperatures ranging from 12 K to 300 K. In particular, we have measured the dependence of the transient reflectivity signal on probing laser frequency, oxygen content, sample's thickness, ambient temperature, and pumping laser intensity. Results obtained at room temperature provide quantitative information on the position of the Fermi level for films with different oxygen contents. Systematic analysis of the measurements performed in the superconducting state indicate that the optical response associated with nonequilibrium properties of YBCO depends strongly on excitation intensity and sample thickness. The observed ultrafast refractive nonlinearity under the low laser excitation cannot be comprehensively interpreted as the relaxation dynamics of quasi-particles, and is speculated to be correlated to the existence of the nonequilibrium intermediate state.

Paper Details

Date Published: 17 June 1993
PDF: 8 pages
Proc. SPIE 1861, Ultrafast Pulse Generation and Spectroscopy, (17 June 1993); doi: 10.1117/12.147068
Show Author Affiliations
Ting Gong, Univ. of Rochester (United States)
Y. Kostoulas, Univ. of Rochester (United States)
Li Xing Zheng, Univ. of Rochester (United States)
W. Xiong, Univ. of Rochester (United States)
Witold Kula, Univ. of Rochester (United States)
Roman Sobolewski, Univ. of Rochester (United States)
Philippe M. Fauchet, Univ. of Rochester (United States)

Published in SPIE Proceedings Vol. 1861:
Ultrafast Pulse Generation and Spectroscopy
Timothy R. Gosnell; Antoinette J. Taylor; Keith A. Nelson; Michael C. Downer, Editor(s)

© SPIE. Terms of Use
Back to Top