On the possibility of effective transformation of broad-band pumping into narrow-band Stokes radiation during stimulated Raman scattering in a selective resonator

The theory of Raman laser is extended to the case of strong nonmonochromatic fields when the width of the pumping frequency spectrum is arbitrary and a transition saturation becomes possible. The resonator is assumed to include a selective element that narrows the spectrum of the generated Stokes wave. The conditions are determined at which the lasing efficiency may be made close to 100%.