Abstract
Recently nonlinear optical properties of materials have been widely studied from the basic and practical points of view. A femtosecond pulse laser is suitable for such studies because of its high peak power and high time resolution, which allow us to distinguish several processes such as thermal and electronic processes. Their fast response and large nonlinear susceptibility make the semiconductor doped glasses promising candidates for use in all-optical signal processing devices [1]. It was shown that the nonlinear refraction index n2 was about three times higher than in CS2 [2]. These materials are commercially available as sharp cut-off optical filters and have also been manufactured in the form of optical fibres and waveguides. Colour filters have been used as the saturable absorbers in optical amplifiers. The size of the microcrystallites in the filter glasses may be varied by heat treatment. In commercially filter glasses semiconductor microcrystallities of 5–20nm diameter are embedded.
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