Far-infrared emission has been observed from an InSb spin-flip Raman laser where a mode-locked TEA CO2 laser is used as the pump source. 400 μW of power are generated in 2-nsec pulses near 100 μm. This contrasts with the usual two-crystal scheme where one crystal is used to generate the Raman Stokes signal and a second InSb crystal is used as a mixer crystal. This experimental simplification allows for a much more direct evaluation of the usefulness of the spin-flip Raman laser as a source of far-infrared radiation. It is concluded that current technology permits construction of a spin-flip Raman far-infrared spectrometer tunable over about 60–125 cm−1.
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E. D. Shaw (1976) studied this question.
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