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      Articles written in Pramana – Journal of Physics

    • Shock wave propagation in soda lime glass using optical shadowgraphy

      PRASAD Y B S R BARNWAL S NAIK P A YADAV Y PATIDAR R KAMATH M P UPADHYAY A BAGCHI S KUMAR A JOSHI A S GUPTA P D

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      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 $(5–7) \times 10^{6}$ cm/s have been obtained. The scaling of the shock velocity with intensity in the $2 \times 10^{13}–10^{14}$ W/cm$^2$ range has been obtained. The shock velocity is observed to scale with laser intensity as $I^{0.38}$. 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

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