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- W89911062 abstract "The purpose of this program was to develop frequency conversion techniques that could efficiently generate new infrared wavelengths suitable for isotope separation, starting with presently available molecular lasers. The approach is nonlinear mixing in cryogenic liquids using third-order difference frequency mixing. The general concepts of third-order nonlinear mixing have been demonstrated for gaseous molecular media, but until recently, have not been considered for liquid media in the infrared. The principal wavelength region in the infrared of interest for isotope separation is near 16 ..mu..m with an alternative region near 8.6 ..mu..m. Four-wave mixing of the type 2..omega../sub 1/ - ..omega../sub 2/ in liquid CO at 77/sup 0/K with an output wavelength of 8.64 ..mu..m was demonstrated. For the two-photon resonant third-order process, a nonlinear susceptibility of absolute value chi = 6.2 x 10/sup -14/ esu was measured. For a pure liquid CO medium and a total input power of 460 kW, the highest observed efficiency was eta = 6.2 x 10/sup -5/. The studies indicate four-wave mixing as a reasonable and promising alternative to existing methods (i.e., nonlinear crystals, tunable semiconductor diode lasers, and optical parametric oscillators) for generating sigmals in the 8.6 regime. (WHK)" @default.
- W89911062 created "2016-06-24" @default.
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- W89911062 date "1977-11-01" @default.
- W89911062 modified "2023-09-27" @default.
- W89911062 title "Infrared-frequency conversion. Final technical report, 10 March 1976-30 September 1977" @default.
- W89911062 hasPublicationYear "1977" @default.
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