Abstract
Recently, 4-wave sum and difference frequency mixing processes in gases and vapors have received considerable attention as possible sources of tunable, coherent radiation in new regions of the electromagnetic spectrum [1]. The efficiencies of these processes have previously been enhanced either by phasematching by addition of a buffer gas of compensating dispersion or by two-photon resonant enhancement of the nonlinear susceptibility. The buffer gas technique works well for nonresonant mixing processes, but has the disadvantages of requiring a highly uniform gas mixture and of introducing additional absorption due to pressure broadening. This pressure broadening is more serious for two-photon resonant processes since broadening of the two-photon resonance reduces the nonlinear susceptibility [2].
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References
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Bjorklund, G.C., Bjorkholm, J.E., Freeman, R.R., Liao, P.F. (1977). Phase Matching of 2-Photon Resonant 4-Wave Mixing Processes. In: Hall, J.L., Carlsten, J.L. (eds) Laser Spectroscopy III. Springer Series in Optical Sciences, vol 7. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-35968-5_38
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DOI: https://doi.org/10.1007/978-3-540-35968-5_38
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