Abstract: Multi-atmosphere CO$-2$/ lasers can provide continuous gain over bands 20 to 30 cm$+$MIN@1$/ wide in each R and P branch of the 00$+0$/ $YLD 10$+0$/ and 00$+0$/1 $YLD 02$+0$/0 bands, covering approximately 60 percent of the 9.2-10.8 $mu@m region. By contrast, the spectrum of a typical low pressure CO$-2$/ lasers is 99 percent empty. We describe design studies and the construction of a 20-atmosphere laser that will operate on a single longitudinal model and prove mode-to-mode tunability, thus effecting a useful compromise between the narrow-line capability of a low pressure laser and the broad tunability of a multi-atmosphere laser. One important application of this laser is to pump double-Raman processes in methyl fluoride which will shift the narrow linewidth and tunability to the 150 to 650 $mu@m region of the far IR. !13
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