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Spectroscopic properties of Nd3+ doped fluoride crystals for amplification at 1.3 μm

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A gain medium for 1.3 μm amplifiers of fiber communication networks has to have (a) high and isotropic gain in (1.28-1.32) μm range, and (b) high pumping efficiency at wavelengths of most suitable pump sources (for instance, diode lasers). The utilization of 4F3/2-4I13/2 transition of Nd3+ ions in crystals and glasses is one of the ways to solve this problem. But two main difficulties have to be overcome for Nd doped media. First of all, it is necessary to shift Nd3+ emission to the desired spectral position, since the fluorescence of Nd3+ ions is usually observed at wavelengths around 1.34 μm. The second obstacle is excited state absorption (ESA) at 4F3/2-4G7/2 transition, that can reduce or suppress totally gain at 4F3/2-4Il3/2 transition.

© 1995 Optical Society of America

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