Abstract
A multilayer system of alternating high and low nonlinear materials can be designed to respond actively to the radiation intensity, whereby it transmits ambient light but rejects high-intensity light over a broad spectral region. The transmission of the low-intensity light is determined by the linear refractive indices of the multi-layer system, which can be designed to transmit the ambient light totally. The high-intensity laser radiation induces a change in the refractive indices through the nonlinear index, which changes the interface reflectance and randomizes the phase shift of each layer. This induced random one-dimensional system will totally reflect the high-intensity laser over a broad spectrum.
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