Open AccessTransient grating spectroscopy of β-carotene pumped with spectrally chirped pulses
Author(s) -
Shintaro Ooi,
Sigehito Mitoma,
Mamoru Nango,
Yutaka Amao,
Mitsuru Sugisaki
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1220/1/012045
Subject(s) - chirp , grating , optics , transient (computer programming) , physics , spectroscopy , materials science , laser , quantum mechanics , computer science , operating system
Nonlinear optical responses of β-carotene were investigated upon excitation using chirped pulses. We especially focus on spectrally resolved transient grating (TG) signals to discuss the influence of the spectral chirp over a wide spectral range. A significant change in the TG signal was observed when negatively chirped pulses were used. The experimental results were qualitatively reproduced by employing the Brownian oscillator model. The relationship between the wave packet motion in the excited state and spectral chirp is discussed. It is concluded that the third order nonlinear optical response reflects the competition between the spectral chirp and the energy separation of the potential curves.