We report optical limiting at 527 nm in two Schott semiconductor-doped
glasses OG530 and OG515. These two glasses show quite contrasting non
linear optical behaviour. The glass OG515 shows strong clamping while
OG530 shows no clamping in optical limiting inspite of having much lar
ger nonlinear refractive index. Similarly OG530 exhibits saturation of
absorption while OG515 does not.