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Optical limiting in polar macromolecules in the nanosecond time range

G. B. HADJICHRISTOV1,* , N. KIROV1, I. L. STEFANOV2

Affiliation

  1. Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd., BG-1784 Sofia, Bulgaria
  2. Department of Quantum Electronics, Faculty of Physics, Sofia University, 5 James Bourchier Blvd., BG-1164 Sofia, Bulgaria

Abstract

The optical limiting by resonant two-photon absorption in polar media, such as some conjugated organic compounds with large polarizable π-electron system and biopolymers, is studied in terms of a three-level mixed-parity molecular system upon nanosecond laser irradiation. The two-photon absorption of polar medium is calculated and its effect on the transmitted laser intensity is analyzed. The numerical results indicate the dependence of the optical limiting efficiency on the magnitude of the permanent dipole moments of the electronic molecular states involved in nonlinear optical interaction between the laser electro-magnetic field and polar macromolecules..

Keywords

Nonlinear optical materials, Optical limiting, Two-photon absorption, Polar media.

Submitted at: March 23, 2007
Accepted at: Aug. 18, 2007

Citation

G. B. HADJICHRISTOV, N. KIROV, I. L. STEFANOV, Optical limiting in polar macromolecules in the nanosecond time range, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 8, pp. 2458-2461 (2007)