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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 11, Iss. 22 — Nov. 3, 2003
  • pp: 2848–2853

Self-diffraction in bacteriorhodopsin films for low power optical limiting

D. Narayana Rao, Chandra S. Yelleswarapu, Sri-Rajasekhar Kothapalli, D.V.G.L.N. Rao, and Brian R. Kimball  »View Author Affiliations

Optics Express, Vol. 11, Issue 22, pp. 2848-2853 (2003)

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We demonstrated a novel technique for low power optical limiting using self-diffraction in bacteriorhodopsin (bR) films. A cw Ar-Kr laser is used as the pump (input beam, 568 nm) and the output is the first order self-diffracted beam with an observed efficiency of about 0.01%. Input beam intensity is varied over three orders of magnitude in the range of milliwatt to watts per cm2 with output clamped at eye safe level of about 0.13 mW/cm2. Threshold intensity for limiting is governed by the saturation intensity of M-state of bR and hence can be varied by choosing films with different lifetimes.

© 2003 Optical Society of America

OCIS Codes
(140.3360) Lasers and laser optics : Laser safety and eye protection
(160.4890) Materials : Organic materials
(230.4320) Optical devices : Nonlinear optical devices
(260.1960) Physical optics : Diffraction theory
(350.4600) Other areas of optics : Optical engineering

ToC Category:
Research Papers

Original Manuscript: September 15, 2003
Revised Manuscript: October 16, 2003
Published: November 3, 2003

D. Narayana Rao, Chandra Yelleswarapu, Sri-Rajasekhar Kothapalli, D. Rao, and Brian Kimball, "Self-diffraction in bacteriorhodopsin films for low power optical limiting," Opt. Express 11, 2848-2853 (2003)

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