Improvements in a 16-μm radiation source based upon the combined effects of stimulated rotational Raman scattering and resonantly enhanced four-wave mixing in parahydrogen gas are described. For this source, the input waves of which are provided by temporally and spatially coincident pulsed beams from a ruby and CO2TEA laser, it was found that cooling the parahydrogen gas from 300 K to~ 40 /pulse, which is near the theoretical limit for the 2.5 MW CO2laser intensities that were applied.
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Sorokin et al. (1977) studied this question.
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