SPIKES IN RAMAN-SPECTRUM OF MINIATURE OPTICALLY PUMPED NH3 FIR LASER

In this paper, the semiclassical density matrix equation was solved to calculate the spectral characteristics of V-2:a--sR(0,0) transition i n a miniature optically pumped NH3 far infrared laser (mini-NH3-OPFIRL ), which was pumped by CO2-10R(6) line. The results of theoretical cal culation showed that the spikes in Raman spectrum of V-2:a--sR(0,0) wo uld appear when the operating NH3 gas pressure was higher than a certa in critical value or pumping power density was fewer than a certain cr itical value, which was caused by Raman processes interaction of AC-St ark splitting in our experiment, 298 mu m FIR spetral line of a--sR(0, 0) pumped by a TEA-CO2 laser with 10R(6) line was observed hut the spi kes could not be observed owing to the limitation of the resolution of the F-P interferometer.