Open AccessTwo-photon area evolution and optical limiting of ultrashort laser pulses in DBASVP molecule media
Author(s) -
Quan Miao,
Peng Zhao,
Sun Yuping,
Ji-Cai Liu,
ChuanKui Wang
Publication year - 2009
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.58.5455
Subject(s) - photon , physics , dipole , laser , two photon excitation microscopy , envelope (radar) , absorption (acoustics) , molecular physics , atomic physics , resonance (particle physics) , bloch equations , optics , condensed matter physics , quantum mechanics , telecommunications , radar , computer science , fluorescence
Taking the one-dimensional asymmetrical π conjugation molecule material DBASVP molecules as medium, with the two-photon resonance, we studied the propagation of ultrashort laser pulses in the medium based on the two-photon area theorem and the numerical solutions of the coupled Bloch and Maxwell's equations. The evolution of two-photon area is thus investigated and the applicability of the two-photon area is then discussed. A theoretical method for simulating the optical limiting properties of molecular medium is pointed out. The molecular electronic structures and dipole moments are calculated by use of density functional theory at ab initio level. The numerical results show that the two-photon area theorem based on the slowly varying envelope and phase approximations cannot accurately describe the evolvution of the two-photon area in the molecular medium. The optical limiting behavior based on the two-photon absorption is related to the width of the molecular medium.