Intensity of harmonic H21 for argon when varying the laser pulse energy of the fundamental laser beam. The inset shows the HHG spectrum with argon gas when the laser pulse energy is 0.4 mJ.
Measured H21 spectrum of the off-axis selection (a) and the on-axis selection (b) as a function of the laser pulse energy. The black lines represent fits to the experimental spectra using Eq. (6) .
Intensity of the harmonic H25 for argon gas when varying the laser pulse energy of the fundamental laser beam.
Measured harmonic spectrum (a) and selected harmonic H25 (b) as a function of the laser pulse energy.
Interference fringes for illumination with H25 only (blue line) and for illumination with all harmonics (red dotted line) in YDS experiments. The inset shows the interferogram recorded in the CCD.
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