Accession Number : AD0427730


Title :   SCATTERING OF RUBY LASER LIGHT BY GASES.


Descriptive Note : Final rept.,


Corporate Author : ILLINOIS UNIV URBANA ENGINEERING EXPERIMENT STATION


Personal Author(s) : George,T V ; Goldstein,L


Report Date : Oct 1963


Pagination or Media Count : 93


Abstract : The advent of the laser has made it possible to conduct a more complete sudy of Rayleigh scattering. Earlier measurements of Rayleigh cross section for gases were made only at right angles to the incident light beam. In the present experiment the angular distribution of the light scattered by gas molecules was measured from 45 to 135 degrees from the direction of the incident beam in argon at one atmosphere and xenon at 135 mmHg of pressure. Experimental results show partial agreement with the Rayleigh theory. The lack of agreement is perhaps due to coherence effects. In argon, the scattered intensity shows a linear pressure dependence. No dependence of scattering cross section on the beam power level was found in either monatomic or polyatomic gases. The differential scattering cross section at an angle of 60 degrees with the beam was determined for various gases and compared with that calculated from known values of refractive indices. An empirical analysis of the discrepancy between the experimental observation and Rayleigh theory is also presented. (Author)


Descriptors :   *LASERS , *SCATTERING , RUBY , GASES , LIGHT TRANSMISSION , ELECTROMAGNETIC RADIATION , REFRACTION , REFLECTION , AIR , HYDROGEN , NITROGEN COMPOUNDS , OXIDES , PHOTOMULTIPLIER TUBES , CALIBRATION , CURVE FITTING , XENON , POLARIZATION , LENSES , OPTICAL EQUIPMENT , OSCILLATORS , FLASH LAMPS , OSCILLOGRAPHS , PROPAGATION


Distribution Statement : APPROVED FOR PUBLIC RELEASE