Competition Between Raman and Line Center Oscillation in Optically Pumped FIR Lasers

摘要

Competition between Raman and line center oscillation in offresonantly pumped FIR lasers is studied by means of semiclassical laser theory. The observed preferential Raman line operation is shown to be caused by an inversion of the line center gain when the Raman mode reaches intensities well below full saturation. This inversion is partly due to simple population effects. A further enhancement in the cross saturation at line center is caused by population pulsations. Numerical examples of mode competition are presented.