Sum-frequency generation with electromagnetically induced transparency (EIT) has been examined in a hydrogen discharge. EIT is demonstrated in the 3p-1s and 4p-1s transitions at 102.6 and 97.3 nm, respectively, with increased efficiency of generation arising from higher H-atom density, although competing effects due to the presence of H₂ distort the line shapes of these spectra. Only for shorter-wavelength transitions (such as 7p-1s and 8p-1s) that show very large shifts and distortions is there a decrease in intensity in comparison with generated radiation from H atoms external to the discharge.
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Tokaryk et al. (1999) studied this question.
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