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(a) The angles are defined from to the other vectors, here taken as positive in the counter-clockwise direction. (b) There are two QPM possibilities for each particular choice of signal and idler wavelengths, being mirror images of each other in the dashed vector . (c) The configuration with the largest overlap of the pump, signal, and idler beams. (d) The spatially-degenerate configuration that is self-selected in noncollinear MOPOs. (The magnitudes of the vectors are approximately drawn to scale for near-infrared pumping and ).
Experimental and theoretical values of and as a function of (a) and the idler tuning from the collinear value as a function of (b), with the pump at 813.3 nm (solid data points, solid line) and 879.2 nm (open data points, dotted line). The curves are calculated for the spatially-degenerate configuration, here denoted .
The signal pulse energy as a function of when the pump intensity is two times the collinear threshold value.
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