Fig. 2: Measured orientation-dependent HHG from ReS2.
From: Orbital perspective on high-harmonic generation from solids
a High-harmonic spectrum for a laser intensity of 0.64 TW/cm2 and polarization along θ = 120∘ (parallel to the rhenium chains). The inset shows an optical micrograph of the bulk ReS2 flake using a CMOS camera and white-light illumination, with the longest edge corresponding to the rhenium chains. Orientation dependence of (b) H9, (c) H11 and (d) H13 for three different intensities: 0.25 TW/cm2 (blue), 0.64 TW/cm2 (green) and 0.76 TW/cm2 (red). We note that in the experiment, the intensity is measured in air before impinging on the material.
