Self-diffraction in bacteriorhodopsin films for low power optical limiting | Zendy

D. Narayana Rao | Zendy; Chandra S. Yelleswarapu | Zendy; SriRajasekhar Kothapalli | Zendy; D. D. Bhaktavatsala Rao | Zendy; Brian R. Kimball | Zendy

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Self-diffraction in bacteriorhodopsin films for low power optical limiting

Author(s) -

D. Narayana Rao,

Chandra S. Yelleswarapu,

SriRajasekhar Kothapalli,

D. D. Bhaktavatsala Rao,

Brian R. Kimball

Publication year - 2003

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.11.002848

Subject(s) - bacteriorhodopsin , optics , diffraction , materials science , diffraction efficiency , beam (structure) , limiting , laser , intensity (physics) , laser beams , optoelectronics , physics , chemistry , mechanical engineering , biochemistry , membrane , engineering

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.

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