Alexandrite spectroscopic and laser characteristic investigation within a 78–400 K temperature range. (31st October 2017)

• Record Type: Journal Article
• Authors: Fibrich, M; Šulc, J; Vyhlídal, D; Jelínková, H; Čech, M
• Is Part Of: Laser physics. Volume 27:Number 11(2017:Nov.)
• Publication Date: 2017-10-31
• Subjects: alexandrite -- diode pumping -- InGaN-laser diode -- cryogenic temperature; Lasers -- Periodicals; 621.36605
• DOI: 10.1088/1555-6611/aa884c
• Languages: English
• ISSNs: 1054-660X

Abstract

Abstract: We report on the influence of temperature on the spectroscopic and lasing properties of alexandrite ( C r 3 + : B e A l 2 O 4 ) crystal. The fluorescence lifetime, polarization-resolved absorption and emission spectra, and laser characteristics at ̃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 ̃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.