Abstract: | Propagation of shock waves in soda lime glass, which is a transparent material, has been studied using the optical shadowgraphy technique. The time-resolved shock velocity information has been obtained (1) in single shot, using the chirped pulse shadowgraphy technique, with a temporal resolution of tens of picoseconds and (2) in multiple shots, using conventional snapshot approach, with a second harmonic probe pulse. Transient shock velocities of (5–7) × 106 cm/s have been obtained. The scaling of the shock velocity with intensity in the 2 × 1013–1014 W/cm2 range has been obtained. The shock velocity is observed to scale with laser intensity as I0.38. The present experiments also show the presence of ionization tracks, generated probably due to X-ray hotspots from small-scale filamentation instabilities. The results and various issues involved in these experiments are discussed. |