Accession Number : ADA316750

Title :   Ultrafast Broadband Photodetectors for High-Tc Superconductive Optoelectronics.

Descriptive Note : Final rept.,

Corporate Author : ROCHESTER UNIV NY DEPT OF ELECTRICAL ENGINEERING

Personal Author(s) : Fauchet, P. M.

PDF Url : ADA316750

Report Date : 12 SEP 1996

Pagination or Media Count : 5

Abstract : The femtosecond optical response of YBCO films has been determined by pump-probe experiments after excitation with ultrashort optical pulses generated by a copper vapor amplified colliding pulse modelocked dye laser. From the results we have obtained as a function of pump intensity, probe wavelength and sample temperature, we find that contrary to the usually accepted interpretation, the position of the Fermi level is not at 2 eV above the copper d-band in oxygen-rich samples (at room temperature) and that the low-temperature optical response is not consistent with the destruction of superconductivity through the destruction of a large density of Cooper pairs via an avalanche process, followed by the restoration of superconductivity on a time scale of several picoseconds. In addition, the laser writing technique has been developed and refined to fabricate simple microbridges in initially oxygen-rich YBCO films.

Descriptors :   *ELECTROOPTICS, *PHOTODETECTORS, LASER BEAMS, LIGHT PULSES, DYE LASERS, COPPER OXIDES, SHORT PULSES, MODE LOCKED LASERS.

Subject Categories : Electrooptical and Optoelectronic Devices
      Optical Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE