Anomalous Double Spin-Flip Raman Scattering in CdS, and a Visible Spin-Flip Laser

Abstract

We have observed a peak in the inelastic light scattering of CdS in high magnetic fields at an energy slightly less than twice the bound electron spin-flip energy $\mu \mathrm{gH}$. The intensity, selection rules, field dependence, and binding energy of this process cannot be explained as second-order scattering. At very high excitation energies ($>~1$ MW/${\mathrm{cm}}^2$) the single spin-flip scattering becomes stimulated, with a sharp threshold and high conversion efficiency.