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Technical rept. 1 Jul-31 Dec 1974
MASSACHUSETTS INST OF TECH CAMBRIDGE FLUID MECHANICS LAB
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The authors have produced continuously-tunable infrared radiation between 4 micrometers and 21 micrometers by mixing the outputs of a ruby laser and a ruby-pumped dye laser in a single rotationally-twinned ZnSe crystal. Regularly-spaced twins should produce an enhancement proportional to the square of the number of twin planes. Preliminary work suggests absorption due to two photon carrier generation may be responsible for the early saturation of the IR conversion efficiency with pump laser intensity. Twelve 4 bar, 3 sub m crystals are noted for possible application for 10 micrometer frequency doubling using regularly spaced rotational twins to make them phase-matchable. Additional crystals suitable for frequency-doubling Nd-YAG lasers into the blue- green spectral region have been identified. Further characterization of the wavelength tuning regions of new-infrared wavelength tuning regions of near- infrared laser dyes has been completed. The effects of optical pumping geometry have been studied for ruby-pumped dye lasers.
APPROVED FOR PUBLIC RELEASE