Physics
Scientific paper
Mar 1966
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1966saosr.205.....l&link_type=abstract
SAO Special Report #205 (1966)
Physics
Scientific paper
The beam of a Q-switched ruby laser was directed toward a diffusely reflecting target at a distance of about 1/2 mile. The image on the target was photographed with a hand camera and the resulting films were measured with a microdensitometer. Two stop-openings were used for the photographs. The films exposed with the smaller stop-opening showed concentrations of energy with intensities up to 700 times the background energy. These concentrations are probably representative of the actual laser beam, but they could be diffraction effects caused by irregularities in the surface of the diffuse target. The films exposed with the larger stop-opening were used to measure this background energy. Its average value was about half the nominal value of the energy determined from calorimetric measurements. This factor of onehalf may be the combined effect of several losses that were neglected in the photometric measurements. The angular divergence of the beam was also measured.
Anderson P. H.
Lehr Carlton G.
Maestre Leonard A.
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