Backward and foreward FIR emmission characteristics drom D2O in both Raman and laser regimes

Laser emission spectra for the 66 and 116 μ D2O lines pumped by the 9.66 μ CO2line in both backward and forward directions have been obtained. Forward spectra are predominantly Raman dominated, except for a narrow pressure region near 2 torr where the 116 μ line is laser-like. Backward spectra appear to be entirely laser-like showing narrower bandwidths and constant frequency. The shape of the pulse outlines in different directions and pressures confirm the findings of the emission spectra. Total FIR energy emission is also asymetric, being significantly greater in the forward direction.