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. 2017 Apr 5;8:14971. doi: 10.1038/ncomms14971

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(a) Evolution of the generated signal as a function of the intensity of the generating beams at focus. The intensity is normalized to an estimated intensity ratio I_2ω/I_ω of about 18%, with I_ω∼1.7 × 10¹⁴ W cm⁻². The intensity is calculated from the measured iris aperture and transmitted energy. The signal is normalized to 1.7 × 10⁷ photons per shot on the CCD (top left corner of each image). (b,c) Evolution of the generated signal as a function of the argon pressure in the cell. (c) The curves display the integrated signal for each individual mode.