Strongly nondegenerate spontaneous parametric down-conversionfor calibration of terahertz-wave detectorsстатья
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Аннотация:The impact of spatial limitation of the nonlinear interaction volume on the spontaneous
parametric down-conversion spectra in a strongly nondegenerate regime is analyzed from the
point of absolute calibration of the terahertz-wave nonlinear-optical detectors. We show
that the idler wave angular resolution of the calibration method can be inherently low (about
1 to 10 degrees in lithium niobate crystals), and to ¯ll all the input modes with external idler
radiation, one has to take special care on geometry of the nonlinear interaction. Angular
sensitivity distribution function is constructed, and a consecutive description is provided for
both the parametric down-conversion and the external idler radiation detection processes.