A. E. Martirosyan
Institute of Physics Research, National Academy of Sciences of Armenia, Ashtarak-2, 378410 Armenia
Received January 10, 2000; in final form, May 4, 2000
Abstract—An optical device designed for nondestructive quality control and measurements of local character-
istics in bulks of crystals and other optical elements with a spatial resolution of the order of 0.1 mm is described.
The parameters determined experimentally are the concentration of impurity ions, the coefficient of scattering
at an angle of 90°, and the light extinction coefficient within local regions. The operating principle of the device
is based on the fluorescent method of counterpropagating laser beams. The distributions of characteristics along
the lengths of LiYF4 : Er3+ and LiYF4 : Nd3+ crystals are studied.
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