Second harmonic Čerenkov radiation in bulk birefringent quadratic medium without any χ(2) modulation

• Intensity dependence of harmonic ring on the polarization of incident wave is obtained.
• Spatial distribution of harmonic patterns is investigated.
• Phase matching condition of second harmonic ring is analyzed.
• Intensity dependence of harmonic ring on the incident wavelengths is obtained.

We carry out experimental studies of second harmonic Čerenkov radiation in the bulk birefringent quadratic medium without any quadratic χ(2)χ(2) modulation. We give a detailed investigation on the phase matching condition of frequency conversion process and the spatial distribution of Čerenkov patterns. We analyze the intensity dependence of the emitted Čerenkov waves on the polarization and wavelengths of the incident fundamental wave. We show that the experimental results closely follow the theoretical predictions.