Raman Scattering from Coherent Spin States inn-Type Cds

When the donor spins in $n$-CdS are simultaneously irradiated with laser light at frequency ${\omega }_L$ and microwaves at frequency ${\omega }_0$ near the spin resonance, intense sidebands at ${\omega }_L\pm {\omega }_0$ are observed for forward scattering which are more than 3 orders of magnitude greater than those for spontaneous spin-flip Raman scattering. This phenomenon is explained as Raman scattering from coherent states.