The titanium-doped sapphire (Ti:Al(2)O(3)) laser is a relatively recent addition to the class of widely tunable lasers. Recent material growth has provided samples of high optical quality and high figure of merit. Cross sections, tuning methods, and large boule evaluation of heat exchanger method growth runs are discussed.
Data have been collected from a standard silicon sample with Cu Kfl radiation selected by means of a pyrolytic graphite monochromator mounted in the scattered beam. The peak shapes can be described reasonably well by Lorentz-type functions, but not by a Gaussian function. These results have been applied to the profile refinement of data for rhombohedral Lao.vsSro.25CrOa, a perovskite-type compound which is slightly distorted from the ideal cubic structure. The analysis, which employs a slightly modified version of a neutron profile program [Rietveld (1969), J. Appl. Cryst. 2, 65-71] indicates that the best compromise for the peak shape is a modified Lorentz function of the form All + C(A20) z]-1.5 fitted over a range of two halfwidths on each side of the Bragg peak position. The results are compared with a similar refinement of.neutron data collected from the same sample.
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