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Schematic diagram of a self-lensing limiter, where the incident beam is assumed to be a fundamental Gaussian beam . (a) Self focusing. (b) Self defocusing. L is lens, M is nonlinear medium, A is aperture, and S is sensor.
Far-field on-axis normalized transmittance as a function of the the position of the nonlinear material of a self-defocusing medium for a fixed value of . Solid and dotted curves correspond to a beam and a beam, respectively.
The normalized transmittance vs the peak nonlinear phase shift in the medium, , for a beam. The position of the medium for each of the curves is indicated by the number along that curve. (a) Medium in front of the beam focus. (b) Medium behind the beam focus.
Optical limiting using a beam with the medium at and . (a) Experimental results with a DR1/PMMA sample. (b) Theoretical results assuming an optical Kerr medium.
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