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Applied Optics

Applied Optics


  • Vol. 42, Iss. 22 — Aug. 1, 2003
  • pp: 4560–4565

Optical power limiting with photoinduced anisotropy of azobenzene films

Pengfei Wu, Reji Philip, Ramesh B. Laghumavarapu, Janakriam Devulapalli, Devulapalli V. G. L. N. Rao, Brian R. Kimball, Masato Nakashima, and Barry S. DeCristofano  »View Author Affiliations

Applied Optics, Vol. 42, Issue 22, pp. 4560-4565 (2003)

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We study the power-limiting properties of photoanisotropic azobenzene films with low-power lasers. The trans-cis photoisomerization and molecular reorientation of azobenzene molecules induced by polarized laser beams result in intensity-dependent anisotropic effects. Consequently, the transmittance of the input beam that passes through the film between two crossed polarizers becomes enhanced at low intensities and clamped at high intensities. The limiting threshold is adjustable by changing the intensity of excitation beam.

© 2003 Optical Society of America

OCIS Codes
(190.4360) Nonlinear optics : Nonlinear optics, devices
(230.4320) Optical devices : Nonlinear optical devices
(260.1440) Physical optics : Birefringence
(310.6860) Thin films : Thin films, optical properties

Original Manuscript: December 17, 2002
Revised Manuscript: April 16, 2003
Published: August 1, 2003

Pengfei Wu, Reji Philip, Ramesh B. Laghumavarapu, Janakriam Devulapalli, Devulapalli V. G. L. N. Rao, Brian R. Kimball, Masato Nakashima, and Barry S. DeCristofano, "Optical power limiting with photoinduced anisotropy of azobenzene films," Appl. Opt. 42, 4560-4565 (2003)

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