Abstract
Incident radiation intensity influence on spectral dependences of Faraday rotation and circularly polarized light absorption in single crystals CdCr<SUB>2</SUB>Se<SUB>4</SUB> near the fundamental absorption edge were investigated. Strong nonlinear Faraday effect and nonlinear absorption were observed. The magnitudes of the effects are nonmonotonic function of the radiation intensity. The maximum increase of the Faraday rotation is equal to 100% of the linear effect value. The effects are explained by influence of photoexcited charge carriers on an excitonic resonance through screening of the internal electric fields existing in single crystals CdCr<SUB>2</SUB>Se<SUB>4</SUB> as well as screening of the electron-hole interaction.
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