Abstract
Infrared (1.2–1.6 μm) luminescence in a ytterbium aluminium garnet (YbAG) crystal, doped with Cr (0.05 at.%) ions, was investigated under CW laser diode pumping ( λ = 940 nm). The Cr 4+ emission band was observed with its peak at 1.34 μm and measured to be about 1.3 times with respect to Yb 3+ IR luminescence ( λ = 1.03 μm). We demonstrate that for the excitation wavelength of 940 nm Yb 3+ ions act as sensitizers of the 3B 2( 3T 2)– 3B 1( 3A 2) emission of Cr 4+ ions. This crystal is promising as a high-efficient system for tunable laser (1.2–1.6 μm) output.
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