Accession Number : AD0638674

Title :   STIMULATED EFFECTS IN N2 AND CH4 GASES.

Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF PHYSICS

Personal Author(s) : Wiggins,T. A. ; Wick,R. V. ; Rank,D. H.

Report Date : 1966

Pagination or Media Count : 17

Abstract : Stimulated Brillouin scattering from N2 and CH4 using a giant pulse laser was observed in an arrangement where-by the laser cannot re-lase and amplify the backscattered radiation. This allows a quantitative study of the parameters affecting stimulated Brillouin scattering. The back-scattered beam converges at the same angle at which the laser beam diverges. The Brillouin component can have a narrow spectral width, 1/3 that of the laser itself, and in some cases can have a duration of only a few nanoseconds. N2 at high pressure can back-scatter as much as 45% of the incident power. The speeds of sound in CH4 and N2 were measured at lower pressures than were previously reported. (Author)

Descriptors :   (*NITROGEN, OPTICAL PROPERTIES), (*METHANE, OPTICAL PROPERTIES), (*SOUND, VELOCITY), SCATTERING, LASERS, BACKSCATTERING, RAMAN SPECTROSCOPY

Subject Categories : Lasers and Masers
      Acoustics
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE