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A diffusion-controlled technique of obtaining gradient in molecular distribution of C[sub 60] molecules in porous vycor glass is presented. Here toluene solution of C[sub 60] 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. [ABSTRACT FROM AUTHOR]

We report the doping of C[sub 60] in porous glass by diffusion in solution phase at room temperature. The presence of C[sub 60] in the doped porous glass was confirmed spectroscopically. We also report the changes in optical absorption spectrum and intensity-dependent transmission of 30 ns laser pulses at 527 nm in these materials. [ABSTRACT FROM AUTHOR]