Efficient stimulated Raman scattering due to absence of second Stokes growth.

Stimulated Raman scattering of a XeCl laser at 308 nm in a high-pressure H(2) cell shows high conversion into first Stokes (S1) because of an unexpected holdoff of the second Stokes (S2) component. Specifically, a photon efficiency of 88% is obtained into S1. Comparison with a plane-wave model indicates that a theory including a spatially nonuniform gain and higher-order mode generation may be necessary to understand the holdoff of the S2 growth.

Spectroscopy of the CF(4) laser.

The frequencies of 28 lines of the (12)CF(4) (nu(2) + nu(4)) ? nu(2) laser have been measured with an accuracy of +/-0.2 cm(-1) for (12)C(16)O(2) pump lines from P(14) to R(24). The CF(4) pump and laser transitions have been identified and the band origin and rotational constant of the nu(2) level determined to be nu(2) = 435.27 +/- 0.06 cm(-1), B(2) = 0.19143 +/- 0.00007 cm(-1). From these constants the laser frequencies expected from any given pumping frequency can be predicted to within +/-0.2 cm(-1).