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, Brian R. Kimball

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


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 cm 2 with output clamped at eye safe level of about 0.13 mW/cm 2. 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.

Original languageEnglish (US)
Pages (from-to)2848-2853
Number of pages6
JournalOptics Express
Issue number22
StatePublished - Nov 2003

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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