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In this article, we employed nanosecond Z-scan technique to demonstrate thenonlinear optical response in Ge30Se55Bi15 thin films after thermal and photoannealing. The intensity dependent open aperture Z-scan traces reveal that forall the samples, i.e. as-prepared, thermal and photo annealed thin filmsexhibit reverse saturable absorption (RSA). The experimental results indicatethat both thermal and photo annealing can be efficiently used to enhance thenonlinear absorption coefficient compared to as-prepared sample. We furtherdemonstrate that beta value of thermally annealed and as-prepared samplesincrease significantly at higher intensities. On the contrary, beta for photoannealed sample does not exhibit appreciable changes against the intensityvariation.

Role of thermal and photo annealing on nonlinear optical response of Ge30Se55Bi15 thin films