Fig. 1: Schematic description of the physical process and of the experiment. | Nature Communications

Fig. 1: Schematic description of the physical process and of the experiment.

From: Observation of strong nonlinear interactions in parametric down-conversion of X-rays into ultraviolet radiation

Fig. 1

a Description of the mechanism for the nonlinearity. The pump X-ray beam is scattered by an optically modulated charges and the frequency of the scattered X-rays is redshifted. b The experimental setup. The synchrotron radiation illuminates a nonlinear crystal. The PDC signal is selected by a multi-bounce analyzer and measured by a two-dimensional detector. The vertical axis of the detector is the deviation of the detected energy from the pump energy, which is determined by the analyzer angle. The horizontal axis is the angle with respect to the Bragg angle that corresponds to the pixel on the camera. c Typical image of Bragg reflection as taken by the detector. d Typical image of PDC. Note that while the profile of the Bragg reflection is very narrow in the horizontal direction the PDC profile is broad.

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