Resonant peak in the output spectral profile of an ionic anti-Stokes Ramanlaser - art. no. 063804

Continuous-wave generation of the anti-Stokes Raman laser is demonstrated i n the new Lambda scheme Ar II 3d' (2)G(9/2)--> 4P' F-2(7/2)--> 4s' D-2(5/2) With quasimetastable initial and final levels. Red pump radiation with wav elength lambda (p)=611 nm from a dye laser that excites transition 3d' (2)G (9/2)--> 4p' F-2(7/2) is converted into the blue radiation at lambda = 461 nm (4p' F-2(7/2)--> 4s' D-2(5/2)) with efficiency of about 30C% The tunabil ity range spans more than 20 GHz around exact resonance, which is five time s broader than the Doppler contour. The output frequency omega is found to depend linearly on the frequency omega (p) of the pump held: omega similar or equal to omega (p)lambda (p)/lambda. A sharp peak of output power is obs erved in the spectral profile at the exact resonance instead of the well-kn own two-photon dip. The model is proposed that includes ionic scattering in plasma and interaction of the running pump and standing output waves. The theory offers an interpretation of the observed peak.