Abstract
We report on influence of temperature on spectroscopic and lasing properties of Alexandrite (Cr3p:BeAl2O4) crystal. Fluorescence lifetime, polarization-resolved absorption and emission spectra, and laser characteristics at ∼750 nm are described in detail within the 78-400K temperature range. As a pumping source, 3.5W InGaN blue laser-diode operating at 444nm wavelength was used. The best results achieved were at ∼353K crystal temperature — 326mW of continuous output power at 750nm wavelength with the slope efficiency near 20p (related to absorbed pump power). At cryogenic temperatures, the Alexandrite laser generation at the so-called R-line, i.e not in the vibronic mode, has been observed.
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