Figure 9

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Idler beam caustics in the narrowband regime of the NRO with the 3-mm thick PPLN at maximum pump level at 20 kHz: experimental data (symbols) recorded with a Pyrocam PY-III-C-B camera (Ophir-Spiricon) using a 30-mm CaF2 lens and fits (lines). The inset shows a far-field idler beam profile recorded at 1 m from the VBG.

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