[21p-211A-1~14] 3.6 Ultrashort-pulse and high-intensity lasers

[21p-211A-8] Coherent control of optical phonons in GaAs using cross-polarized dual pulses

〇Takashi Kitashima¹, Yu Mishima¹, Hiromu Matsumoto¹, Yosuke kayanuma^1,2, Fujio Minami¹, Kazutaka Nakamura¹ (1.MSL Tokyo Tech, 2.Dept. Phys. OPU)

Keywords:femtosecond laser, coherent phonons, semiconductor

We measured coherent optical phonons (LO phonon with 8.7 THz) in a GaAs single crystal via transient reflectivity using a pump-probe technique with femtosecond optical pulses. The phonon amplitude was coherently controlled by using a pair of phase locked pump pulses, in which their polarization is orthogonal each other in order to suppress an optical interference. The interval of the pump pulses was controlled with a 0.3-fs step. The initial phase phonon interference was also studied.