PT Journal
AU Semenov, AD
   Goghidze, IG
   Gol’tsman, GN
   Sergeev, AV
   Gershenzon, EM
TI Evidence for the spectral dependence of nonequilibrium picosecond photoresponse of YBaCuO thin films
SO Appl. Phys. Lett.
JI Appl. Phys. Lett.
PY 1993
BP 681
EP 683
VL 63
IS 5
DI 10.1063/1.109928
DE YBCO HTS detectors; nonequilibrium
AB The transient voltage photoresponse of current biased YBaCuO thin films to 20 ps laser pulses of 0.63 and 1.54 μm wavelengths is measured for temperatures around the superconducting transition region. The fast picosecond decay of the response is followed by a slow nanosecond relaxation which is associated with the bolometric effect. The magnitude of the fast component of the response varies in proportion to the square root of wavelength that plausibly reflects multiplication processes of photoexcited electrons via electron–electron scattering and interaction with high energy phonons.
ER