TY - JOUR
T1 - Modulation on Optical Limiting and Two-Photon Absorption Behavior of a Molecular Medium by Two-Color Ultrashort Laser Pulses
AU - Zhang , Yu-Jin
AU - Song , Yu-Zhi
AU - Wang , Chuan-Kui
JO - Journal of Atomic and Molecular Sciences
VL - 2
SP - 163
EP - 170
PY - 2014
DA - 2014/05
SN - 5
DO - http://doi.org/10.4208/jams.100313.010414a
UR - https://global-sci.org/intro/article_detail/jams/8321.html
KW - optical limiting, two-photon absorption, Maxwell-Bloch equations, two-color pulse.
AB - <p style="text-align: justify;">The dynamical behavior of two-color ultrashort laser pulse propagating in
a molecular medium 4,4&#39;-bis(di-n-butylamino)stilbene (BDBAS) has been studied by
employing an iterative predictor-corrector finite-difference time domain (FDTD) technique
to solve the Maxwell-Bloch equations. The results indicate that the spectrum
of electric field shows oscillation feature around the two-photon resonant frequency
when the delay time exists due to the interaction between two sub-pulses. The optical
limiting window turns narrower and the saturation value of output intensity gets
larger with the presence of delay time compared with no delay time case. The dynamical
TPA cross section is smaller with the increase of delay time. The studies suggest a
method to modulate the nonlinear optical properties of the medium by controlling the
delay time of the two-color pulse.</p>