Hanna, D.C., Smith, R.C. and Stanley, C.R.
Generation of tunable medium infra-red radiation by optical mixing in proustite
Optics Communications, 4, . (doi:10.1016/0030-4018(71)90155-6).
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The outputs of a ruby laser and a tunable dye laser (pumped by the ruby laser) have been frequency-mixed in a proustite crystal. Difference wavelengths have been generated around 5 and 11 µm tuning being achieved for the latter covering the range 10.1 to 12.7 µm. Extrapolations from these preliminary results indicate that currently available lasers and nonlinear crystals should allow continuous tuning from 2.5 to 12.5 µm, with bandwidths substantially smaller than 0.1 /cm and at pulsed powers of the order of a kilo-watt.
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