Fig. 3: Strength dependence of the phonon-assisted harmonic spectra.
From: Enhanced high harmonic efficiency through phonon-assisted photodoping effect
a Laser strength dependence of the harmonic yields for bulk hBN with the frozen ions. For the probe pulse, we employ an in-plane driving electric field with a wavelength of λ = 800 nm with different intensities (I0) and the polarization is parallel to the vibrational mode of TO (E1u) mode. b The same quantity as (a) for the conditions with the excited TO (E1u) mode.
