title: Development of an optical time-resolved measurement system under high-pressure and low-temperature with a piston-cylinder pressure cell.
abstract: To perform the femtosecond pump-probe spectroscopy under high pressure and low temperature, we constructed a measurement system with a piston cylinder type pressure cell installing an optical fiber bundle. The applied pressure was achieved to 6 kbar and the cell was cooled down to 15 K. Several demonstrations revealed that broadening and change of polarization of pulse (duration of ∼120 fs) owing to the dispersions in the fiber bundle are much small indicating that those have little influence on the measurement of carrier relaxation dynamics. In the measurements of κ-(BEDT-TTF)2Cu(NCS)2 under 1.3 kbar at 43 K, we have successfully detected the polarization anisotropy of the carrier relaxation dynamics and estimated the decay time in the same way as the normal measurement.
authors.affiliation: Department of Applied Physics, Hokkaido University, Hokkaido 060-8628, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Tsuchiya
authors.affiliation: Department of Applied Physics, Hokkaido University, Hokkaido 060-8628, Japan.
authors.forename: Yohei
authors.initials: Y
authors.lastname: Kino
authors.affiliation: Department of Applied Physics, Hokkaido University, Hokkaido 060-8628, Japan.
authors.forename: Koichi
authors.initials: K
authors.lastname: Nakagawa
authors.affiliation: Department of Applied Physics, Hokkaido University, Hokkaido 060-8628, Japan.
authors.forename: Daisuke
authors.initials: D
authors.lastname: Nakagawa
authors.affiliation: Graduate School of Material Science, University of Hyogo, Hyogo 650-004, Japan.
authors.forename: Jun-Ichi
authors.initials: J
authors.lastname: Yamada
authors.affiliation: Department of Applied Physics, Hokkaido University, Hokkaido 060-8628, Japan.
authors.forename: Yasunori
authors.initials: Y
authors.lastname: Toda