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(a) A detail of the hexagonal lattices (2D period ) fabricated in thick MgSLT substrates, as revealed by a light etch in hydrofluoric acid. In the OPG experiments the crystals were pumped by a single beam , propagating at a small angle with respect to the NPC symmetry axis . (b) QPM diagram on the reciprocal lattice for twin-beam OPG involving the RLVs and , oriented at ±30° with respect to .
(a) Spectral measurements on the twin-beam OPG signal outputs, emitted at and (internal angles with the pump beam), made for: , , and (twice the OPG threshold). Dotted line: spectrum for the signal at . Dashed line: spectrum at . Solid line: spectrum measured by coupling both signal beams into the spectrum analyzer . (b) QPM diagram for twin-beam OPG with a shared-idler, i.e., in Eq. (1).
(a) Spectral and (b) angular tuning of the OPG signal with the pump wavelength . Experimental data (signal wavelengths, , and output angles, ) shown as power contour plots in (a) and dots in (b). Curves: calculations based on Eq. (1), with , , and , Sellmeier equations of Ref. 14.
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