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Experimental setups for double optical gating. (a) The SH field is added to the polarization gating field with a Mach–Zehnder interferometer. (b) The SH field and the gating field are generated and combined collinearly.
Laser fields in the collinear setup. (a) The driving and gating components after the second quartz plate. (b) The field components with the second harmonic (dashed line) contribution after the BBO crystal.
Comparison of argon and neon spectra generated. (a) The argon and neon supercontinuum images. (b) The line out plots of the normalized spectra for argon (solid line) and neon (dashed line). (c) The Fourier transforms of the spectra for argon (solid line) and neon (dashed line) from (b) assuming flat spectral phase.
(a) The effects of a relative phase scan between the SH and fundamental pulses on the high harmonic spectrum. (b) Experimental (solid line) and calculated (dashed line) spectrally integrated signals.
The effects of CE phase on the DOG high harmonic spectrum. The gating was applied with (a) the collinear method and (b) the interferometer method.
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