An investigation was made of the luminescence and lasing spectra of a calcium niobium gallium garnet crystal activated with Cr 3+ and Nd 3+ ions. An effective nonradiative energy transfer from the chromium to the neodymium ions was discovered. The probability of an elementary Cr→Nd interaction event was determined. A detailed study was made of the Stark structure of the ground ( 4 I 9/2 ) and metastable ( 4 F 3/2 ) levels of Nd 3+ . Selective laser excitation was used to identify four main optical Nd 3+ centers for which the splitting schemes of the 4 I 9/2 and 4 F 3/2 levels were constructed. Lasing was observed at 300 K as a result of the 4 F 3/2 → 4 I 11/2 transition in crystals activated with Cr 3+ and Nd 3+ .
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Voron’ko et al. (1988) studied this question.