Far-infrared generation from a spin-flip laser

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Abstract
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.