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Optica Publishing Group
  • Quantum Electronics and Laser Science Conference
  • OSA Technical Digest (Optica Publishing Group, 1993),
  • paper QFJ1

Optical guiding of intense picosecond pulses in a preformed underdense plasma

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Abstract

Appropriate refractive-index profiles for optical guiding of short, intense pulses arc prepared by using a two-pulse technique made possible through two-pulse operation of a Nd:YAG regenerative-amplifier system (RGA). Two seed pulses are injected into the RGA, with variable delay between 50 ps and 10 ns. The 100-ps output pulses, with maximum energy 200 mJ, are exactly Spatially overlapped at the focus of f/10 lens inside a chamber filled with 5-100 Torr of N2, Ar, or Xe. The first pulse creates a heated column of electrons, which subsequently drives a radially expanding shock structure into the surrounding weakly ionized/neutral gas, the speed of which depends on the ion mass. The resulting electron-density profile is observed to guide the second pulse, injected after an optimum delay that increases with ion mass.

© 1993 Optical Society of America

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