Optical measurements of the. omega. /sub 0//2 and 3/2. omega. /sub 0/ light from 1. 064. mu. m-irradiated plasmas

Abstract

The spectrum and absolute level of both the ..omega../sub 0//2 and 3/2..omega../sub 0/ light have been measured at Argus over a wide range of intensities, spot sizes and energies (3 to 500 joules at 700ps). We will also present measurements at Shiva in which the spectrum, time dependence, and angular distribution of the Raman-scattered light have been measured. As much as several percent in some of these experiments. A particularly interesting experiment was performed at Argus in which a 500A thick Formvar (CH) foil was irradiated with 90 joules in 700ps. The spot size was 200 ..mu..m with a diverging f/2 beam. A calorimeter measured 0.1 J/sr in Raman light in the backwards direction. Discrete InAs detectors looking at the amount of Raman light at 1.9 and 2.0 ..mu..m detected about as much in the forward direction as the backward direction