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In this study, 0.5 at% Cr 3+  and 1 at% Nd 3+  co-doped YSAG (Nd,Cr:YSAG) single crystal was grown by the Czochralski technique. The crystal structure is characterised with X-ray diffraction method. Compared with the absorption of Nd:YSAG crystal, two broad and intense absorption bands are observed in visible region of Nd,Cr:YSAG crystal, which are corresponding to the transitions of Cr 3+  from ground state  4 A 2  to excited states  4 T 1  and  4 T 2 , respectively. Using visible lights excitation (459 nm and 589 nm), the emission intensity of Nd,Cr:YSAG crystal is much stronger than that of Nd:YSAG crystal. The energy transfer mechanism from Cr 3+  to Nd 3+  ions in YSAG crystal is analysed. All the results indicate that Nd,Cr:YSAG is a promising high efficient 1 μm laser crystal suitable for solar or flash lamp pumping.

Growth and luminescence properties of Nd,Cr:YSAG crystal