High dynamic range optical limiting in fullerene doped porous glasses

A diffusion-controlled technique of obtaining gradient in molecular distribution of C60 molecules in porous vycor glass is presented. Here toluene solution of C60 is allowed to diffuse only in one-dimension. The molecular distribution in the doped glass is measured by transmission method. By comparing optical limiting performance in the graded and uniformly doped glasses, we show that there is about 10-fold increase in the dynamic range in graded device.