| Abstrakt: |
Abstract: A study of energetic femtosecond laser pulses interaction with multicomponent glasses was performed. The nonlinear interaction was analysed by registration of spectral broadening, caused mainly by selfphase modulation effect. The source of the pulses was a femtosecond Cr: Forsterite laser system working at wavelength of 1240 nm and providing gigawatt peak power pulses. Using various multicomponent glasses linear dependency between the measured spectral broadening and nonlinear refractive index n2 values, determined previously by Z-scan method, was identified. Moreover, correction of broadening values for real interaction intensity was performed considering the reflection and absorption losses in the glass samples, resulting in significant increase of the linear approximation correlation. The results express reasonable correspondence with experimental Z-scan method values in the case of samples with lower nonlinear refractive index. Using an appropriate reference ample with known n2, the presented method has potential to estimate the nonlinear refractive index of arbitrary new sample. |
