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Shadowgraph And Interferometry Experiments With A Ten-Picosecond Light Source At Various Wavelengths

A very fast (~ 10 psec) laser light source has been constructed which can be used to make shadowgraph, interferometry, and other diagnostic photographs useful in laser fusion studies. To produce this pulsed light source, a portion of the 100 psec main Nd:glass laser pulse is split off, sent through CS2 cells to produce a frequency chirp, and then optically compressed by diffraction gratings. By frequency converting the output pulse, one can perform studies at frequencies other than the fundamental (i.e., harmonic or Raman-shifted frequencies). The compressed pulse is absolutely time-synchronized with the main laser pulse. Shadowgrams taken using this technique are shown.