Abstract
The spectroscopic and stimulated-emission (4F3/2→4I11/2) properties of the novel melilite-type laser crystal Ca2MgSi2O7:Nd3+(Na+) were studied in a temperature range that covers its incommensurate–commensurate (IC↔N) phase transition. The phase transition temperatures of both undoped Ca2MgSi2O7 and the doped crystal were ascertained at 346.6 K (undoped) and 341.3 K (doped) by means of differential scanning calorimetry (DSC). The temperature-dependent spectroscopic and laser experiments showed a significant decrease in CW output power and a strong distortion of the generated lasing beam in the region of the phase transition. The observed crystal field disorder of Nd3+ lasants in Ca2MgSi2O7:Nd3+(Na+) is dominantly due to occupation of the position of Ca2+ by cations of different valency, while the influence of incommensurability is of minor importance.
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