Optical Limiting in a Photorefractive Polymer
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199 Mat. Res. Soc. Symp. Proc. Vol. 479 01997 Materials Research Society
phase-conjugator (SPPC) is another possible optical limiter - in this case the single incident beam pumps the phase conjugator, and when the cavity beam appears, the pump is again depleted. This scheme has the intriguing feature that not only does it limit the transmitted coherent light, but it also reflects a portion of the incident "coherent threat" straight back at the source. Whatever the exact configuration or limiting mechanism, the nature of the photorefractive effect [11] is such that the speed at which the limiting occurs will ultimately be determined by how long it takes to build up a grating in the material, and this will depend linearly (or sublinearly for some materials) on the intensity. This means that the PR limiter is in fact an energy limiter [5,6] - increasing the intensity will increase the speed at which the limiting sets in, but the energy transmitted during the grating formation time will remain constant. Thus, writing the grating growth time as "g=AJIx
(0.5
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