Journal
LASER PHYSICS
Volume 27, Issue 11, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1555-6611/aa884c
Keywords
alexandrite; diode pumping; InGaN-laser diode; cryogenic temperature
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Funding
- Czech Science Foundation [15-05360S]
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We report on the influence of temperature on the spectroscopic and lasing properties of alexandrite (Cr3+ : BeAl2O4) crystal. The fluorescence lifetime, polarization-resolved absorption and emission spectra, and laser characteristics at similar to 750 nm are described in detail within a 78-400 K temperature range. As a pumping source, a 3.5 W InGaN blue laser-diode operating at a wavelength of 444 nm was used. The best results achieved were at a crystal temperature of similar to 353 K with 326 mW of continuous output power at a wavelength of 750 nm with a slope efficiency near 20% (related to absorbed pump power). At cryogenic temperatures, alexandrite laser generation at the so-called R-line, i.e. not in the vibronic mode, has been observed.
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