Figure 1
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a) Scheme of the SFG setup used for the noise photon generation study, see text for components details. b) Image obtained with the camera when both signal and pump lasers are sent into the PPLN and F1 is removed. The spot at 532 nm corresponds to the parasitic SHG of the pump and the spot at 632.7 nm corresponds to the SFG wavelength. This image is used to calibrate the X-axis in wavelength.
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