Materials doped with trivalent rare earth Nd ions are important optical materials for use in the field of lasers and optical waveguides, primarily due to the unique properties of the Nd3+ ion which were known [1] long before Nd3+ was lased in a crystalline [2] and a glass host [3]. Since it is much easier to synthesize large sized samples of Nd3+-doped glasses than to grow crystals, much research work has been reported during the past few years [4-8] on the spectroscopic, fluorescence and lasing properties of these glasses. However, no systematic and detailed studies on the acousto-optic (AO) properties of these glasses have been reported so far. A good acousto-optic material must have good optical quality, low optical and acoustical losses and high AO figures of merit.
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