Abstract

The radial distribution of the pump energy absorbed within a ruby rod when pumped by a helical flash-tube is experimentally measured. The measurement is performed by taking near-field pictures of the emission pattern of the red fluorescence of the ruby. The emission pattern in this case is a visual reproduction of the energy absorbed at each point of the rod. The following three cases are considered: (a) ruby rod in air, (b) ruby rod covered by a cylindrical sheath of water, and (c) ruby rod covered by a cylindrical sheath of benzyl benzoate. The influence of the ground-state depopulation due to the pumping on the radial distribution is also studied. Experimental curves for the energy density are compared with theoretical curves obtained from the theory developed in a previous paper. The agreement is fairly good, the theoretical curves not differing from the experimental ones by more than 20%.

© 1964 Optical Society of America

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