ARGUS laser plasma experiments at 1. 06. mu. m, 0. 53. mu. m and 0. 35. mu. m

Conference · Fri Jan 01 00:00:00 EST 1982

OSTI ID:5601159

Turner, R. E.; Campbell, E. M.; Mead, W. C.; Ze, F.; Max, C.; Phillion, D. W.; Lee, P.; Pruett, B.; Tirsell, G.; Lasinski, B. F.

ARGUS wavelength scaling experiments have been performed on low (Be) and high (Au) Z disk targets, with laser wavelengths of 1.06 ..mu..m, 0.53 ..mu..m and 0.35 ..mu..m. The laser provided a 700 psec pulse, with up to 100J and 1.06 ..mu..m; 200J at 0.53 ..mu..m; and 40J at 0.35 ..mu..m. Laser intensities on target ranged from 3 x 10/sup 13/ to over 3 x 10/sup 15/W/cm/sup 2/, using an f/2.2 focusing system. Box calorimeter measurements show the expected increasing fractional absorption at shorter laser wavelengths; absolutely calibrated hard x-ray detectors show the number of suprathermal electrons to be greatly decreased. Scattered light measurements concentrated on stimulated Raman scattering, and the 3/2 harmonic. The SRS was spectrally and temporally resolved during 0.53 ..mu..m irradiations; our measurements showed the scattering to be principally from the convective instability, near tenth critical density. Near ..omega../2, a double peaked spectral feature is observed. The time resolved data show a number of interesting features, which are discussed.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5601159
• Report Number(s): UCRL-86911; CONF-820119-2; ON: DE82006859; TRN: 82-008469
• Resource Relation: Conference: 15. European conference on laser interaction with matter, Garching, F.R. Germany, 18 Jan 1982
• Country of Publication: United States
• Language: English

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