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We have generated continuously tunable infrared output between 3.5 and 13 μm by coherent Raman mixing in H2 gas at 20 atm using a Nd : YAG laser-pumped LiNbO3 parametric oscillator as the input source. The coherent Raman mixing method offers significant advantages over stimulated Raman scattering for frequency conversion.
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Brosnan et al. (1977) studied this question.
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