Extended Data Fig. 3: Crystal orientation dependence of high-harmonic generation in MgF2.
The intensity of the third, ninth and thirteenth harmonics measured as a function of the crystal angle at field strengths (F0 = 0.58, 0.65 and 0.7 V Å−1) of the driving pulse. The rotation of the crystal is performed with respect to the c axis. The azimuthal angle represents the orientation of the crystal with respect to the laser polarization and the radius represents the harmonic yield. The four-fold symmetry of the crystal suggests a square lattice. Error bars in the measured data indicate the standard deviation of the mean value from four measurements acquired under identical conditions.
