Abstract

A phenomenological analysis and experimental observations of second-harmonic generation (SHG) in magnetic semiconductors with zinc blende crystal structure $\overline{4}3\mathrm{m}$ in zero and nonzero magnetic fields are presented. A magnetic field reduces symmetry and gives rise to new SHG components. SHG transmission spectra were studied in ${\mathrm{Cd}}_{1-x}{\mathrm{Mn}}_x\mathrm{Te}$ with $x=0.24,$ 0.35, and 0.40. At low temperatures a narrow SHG band at 1.98 eV in the vicinity of the fundamental bandgap was observed in a (110) sample with $x=0.24.$ The band disappears with a temperature increase when short-range magnetic ordering vanishes. Below the bandgap a SHG signal is found that varies strongly as a function of magnetic field. We relate this phenomenon to magnetic linear birefringence and the shift of the bandgap in a magnetic field.

© 2005 Optical Society of America

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