Stimulated Raman scattering in carbon dioxide and a measurement of time for V-T energy transfer

A weak Q-switched ruby laser (1 MW, 40 nsec, 0.015 cm^-1 linewidth) was focused into a cell (CO₂, 50 atm). The spectrum of the total output energy (40–50 MW, 25 nsec) was studied. In addition to powerful Brillouin scattering, the first stimulated Raman Stokes line of CO₂ (10 MW) and the first three anti-Stokes Raman lines were observed for the first time in pure CO₂. It was also possible to obtain coherent Raman excitation in a second CO₂ cell for pressure down to 3 atm. This last experimental result has been applied to the measurement of the time for V-T transfer in CO₂.