Ultrafast relaxation in Y-Ba-Cu-O and Ni thin films studied by nonlinear spectroscopy technique

Victor N. Bagratashvili; Vladimir A. Lobastov; Alexander N. Zherikhin; V. M. Petnikova; Vladimir V. Shuvalov

doi:10.1117/12.131857

30 November 1992 Ultrafast relaxation in Y-Ba-Cu-O and Ni thin films studied by nonlinear spectroscopy technique

Victor N. Bagratashvili, Vladimir A. Lobastov, Alexander N. Zherikhin, V. M. Petnikova, Vladimir V. Shuvalov

Proceedings Volume 1842, Mode-Locked Lasers and Ultrafast Phenomena; (1992) https://doi.org/10.1117/12.131857
Event: XIV International Conference on Coherent and Nonlinear Optics, 1991, St. Petersburg, Russian Federation

Abstract

By picosecond spectrometer with two tunable dye lasers, high temperature superconducting (HTSC) (monocrystal Y-Ba-Cu-O with critical temperature Tc equals 87 K) and metal (Ni) thin films have been investigated. A self-diffraction process efficiency (eta) versus biharmonic pumping component detuning (Omega) has been measured at the temperature (Theta) equals 300 and 80 K. It is found that there is a well-defined dip on the dispersion curve (eta) ((Omega) ) for the HTSC films at (Theta) equals 80 K and -10 cm-1 (Omega) -50 cm-1. This region upper limit corresponds to a superconducting energy gap value 2(Delta) . At 10 cm-1 -1, any distinction of the same type is absent. In other respects all obtained dispersion curves are similar. They consist of the central peak ((eta) approximately equals 10-7, (Omega) -1) and wide wings ((eta) approximately equals 10-9, (Omega) 10 cm-1) with the interference structure. Y-Ba-Cu-O film resonances are coincided with the phonon mode frequencies (120, 335, and 580 cm equals -1). It is shown that photoexcitation kinetics (the sample ''darkening'') must consist of some components. A characteristic time of the most ''ultrafast'' component below 5 fs has been estimated and a complex subpicosecond quantum beats presence has been predicted.

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Victor N. Bagratashvili, Vladimir A. Lobastov, Alexander N. Zherikhin, V. M. Petnikova, and Vladimir V. Shuvalov "Ultrafast relaxation in Y-Ba-Cu-O and Ni thin films studied by nonlinear spectroscopy technique", Proc. SPIE 1842, Mode-Locked Lasers and Ultrafast Phenomena, (30 November 1992); https://doi.org/10.1117/12.131857

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