Femtosecond optical nonlinearities in YBa2Cu3O7-x

Ting Gong; Y. Kostoulas; Li Xing Zheng; W. Xiong; Witold Kula; Roman Sobolewski; Philippe M. Fauchet

doi:10.1117/12.147068

17 June 1993 Femtosecond optical nonlinearities in YBa2Cu3O7-x

Ting Gong, Y. Kostoulas, Li Xing Zheng, W. Xiong, Witold Kula, Roman Sobolewski, Philippe M. Fauchet

Proceedings Volume 1861, Ultrafast Pulse Generation and Spectroscopy; (1993) https://doi.org/10.1117/12.147068
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

Abstract

We have performed a series of femtosecond reflectivity experiments on various YBa₂Cu₃O_7-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.

Citation Download Citation

Ting Gong, Y. Kostoulas, Li Xing Zheng, W. Xiong, Witold Kula, Roman Sobolewski, and Philippe M. Fauchet "Femtosecond optical nonlinearities in YBa2Cu3O7-x", Proc. SPIE 1861, Ultrafast Pulse Generation and Spectroscopy, (17 June 1993); https://doi.org/10.1117/12.147068

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available