Conservation of spatial coherence of Stokes beams amplified in a multimode pumping field
Betin A.A., Pasmanik G.A.
Using A Mandel'shtam-Brillouin converter as an example, it is shown that effective pumping of multimode optical radiation into a single-mode Stokes wave is feasible in principle, and the conditions under which such a pumping can be realized are explained. A similar spatial-coherence conservation effect is observed also in the amplification of Stokes beams having a more complicated profile in a strongly inhomogeneous pumping field.