Thermal nonlinearities in GaSe

• DOI: 10.15251/cl.2021.184.155
• Publication Date: 2023-02-23T12:45:02Z
• Authors: V. M. Salmanov; M. A. Jafarova; ; A. G. Guseinova; ; R. M. Mamedova; ; A. A. Salmanova
• Keywords: Absorption edge

The nonlinear light absorption at the fundamental edge under laser excitation in GaSe crystals has been investiqated experimentally. It is shown that high levels, coefficient shifted towards lower energies (red shift). refractive index positive frequencies below and negative on high-energy side. laser-induced change referred to as a selfdefocusing optical nonlinearity. Δn(ω) side selffocusing measured parameters showed exhibits strong properties.