Using Slow Light to Enhance Acousto-optical Effects: Application to Squeezed Light

We propose a technique for achieving phase matching in Brillouin scattering in a dielectric fiber doped by three-level $\Lambda$-type ions. This can lead to a dramatic increase of efficiency of ponderomotive nonlinear interaction between the electromagnetic waves and holds promise for applications in quantum optics such as squeezing and quantum nondemolition measurements.