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DFG experimental setup. Two different focusing lenses were used to focus the beams inside the PPLN crystal. The output waves are focused into the InSb detector with a lens . The Ge filter blocks the pump and signal beams, allowing only for the idler beam to be detected.
Temperature-tuning curve for the PPLN crystal. The plot is divided into two regions separated by a dotted line: the first region represents the calculations of the BK focusing function for (solid curve) and the second region is when (dashed curve). The large dots represent the experimental data points in both regions.
Graph of DFM output (idler wave) power at vs signal power. Note that the pumping power is kept constant at all times. The solid line is a linear fit of the data points.
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