Figure 5
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Spatial characteristics of the tunable, narrowband NRO with the 1-mm thick PPLN: measured (a) signal and (b) idler caustics in the horizontal plane with fitting for the evaluation of the M 2 propagation factor. The average pump power is 16 W at 30 kHz and the oven temperature is set to 169 °C corresponding to 1880 nm (signal) and 2453 nm (idler). The insets show recorded near-field beam profiles.
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