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Journal of Nonlinear Optical Physics & Materials

OPTICAL NUTATION AND FREE INDUCTION DECAY IN MAGNETOACTIVE INDIUM ANTIMONIDE

J. T. Andrews, Pratima Sen

Published Sep 1, 1999• 0 citations
Publisher

Abstract

Using the density matrix approach, the effect of magnetic field on optical nutation and free induction decay (FID) has been investigated analytically in direct gap semiconductors. The numerical estimations made for a thin sample of bulk InSb duly irradiated by a Lead salt (PbEuSeTe) diode laser exhibit an enhancement in the beat signal intensity of the nutating output at large magnetic fields. The numerical analysis of free induction decay in InSb crystal–laser interacting system yield the results that both the decay time as well as transmitted field amplitude increase with increasing magnetic field.

DOI
10.1142/s0218863599000308

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A theory of optical free-induction decay (FID) induced by two exciting light pulses in three-level atomic systems subjected to a constant magnetic field is presented. The theory takes into account the hyperfine interaction, the level degeneracy, and the dependence of the FID signal on the polarizations of the exciting pulses. An analysis of the FID signal in a magnetic field suggests new ways to measure the g factors of the levels, the hyperfine structure constants, and the relaxation rates. The results obtained are extended to include the echelon excitation of the multilevel system by a definite set of light pulses with specially chosen frequencies and polarizations.
Stark shift and self-energy correction in a non-centrosymmetric semiconductor have been studied by using the time-dependent perturbation technique and considering the diagonal elements of the transition dipole moment operator to be finite. The Stark shift obtainable from the Rabi frequency shows a time dependence. The analysis is applied to a sample of InSb duly irradiated by a near-resonant laser and it is found that the magnitude of Stark shift decreases while the magnitude of self-energy correction increases due to the incorporation of non-centrosymmetry.