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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Editor: Henry M. Van Driel
  • Vol. 24, Iss. 9 — Sep. 1, 2007
  • pp: 2436–2442

Breakdown of optical power limiting and dynamical two-photon absorption for femtosecond laser pulses in molecular medium

Chuan-Kui Wang, Ji-Cai Liu, Ke Zhao, Yu-Ping Sun, and Yi Luo  »View Author Affiliations

JOSA B, Vol. 24, Issue 9, pp. 2436-2442 (2007)

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We solve numerically the Maxwell–Bloch equations using an iterative predictor-corrector finite-difference time-domain technique to study the propagation of femtosecond laser pulses in a strong two-photon absorption (TPA) organic molecular medium [ 4 , 4 -bis(dimethylamino) stilbene]. The hybrid density functional theory is used to calculate electronic structures of the compound. The molecular system is described by a three-level model in an optical regime and has demonstrated a good optical power limiting behavior in a certain intensity region. Thresholds for the breakdown of optical power limiting are observed that are dependent on the input pulse width and, slightly, the propagation distance. The dynamical two-photon absorption cross section is obtained, which is almost a linearly increasing function of the pulse width in the femtosecond time domain. The propagation distance also has an obvious influence on the measurement of the TPA cross section, and nonmonotonic dependence of the TPA cross section on propagation distance is observed. The input pulse width and the thickness of the molecular samples thus should be taken into account when the TPA cross section is measured.

© 2007 Optical Society of America

OCIS Codes
(020.4180) Atomic and molecular physics : Multiphoton processes
(190.4180) Nonlinear optics : Multiphoton processes
(320.2250) Ultrafast optics : Femtosecond phenomena

ToC Category:
Atomic and Molecular Physics

Original Manuscript: April 25, 2007
Revised Manuscript: June 28, 2007
Manuscript Accepted: June 30, 2007
Published: August 28, 2007

Chuan-Kui Wang, Ji-Cai Liu, Ke Zhao, Yu-Ping Sun, and Yi Luo, "Breakdown of optical power limiting and dynamical two-photon absorption for femtosecond laser pulses in molecular medium," J. Opt. Soc. Am. B 24, 2436-2442 (2007)

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