Abstract
The absorption and fluorescence spectra of Er3+:LiGdF4 crystal was measured at room temperature. Base on the Judd-Ofelt theory, the intensity parameters of Er3+ in LiGdF4 crystal were determined, Ω2=0.905×10-20cm2, Ω4=2.47×10-20cm2 and Ω6=4.92×10-20cm2. The values of the radiative transition probabilities, branching ratios, integrated emission cross-section and radiative lifetimes of excited states of Er3+ in LiGdF4 crystal were calculated. The stimulated emission cross-section was also evaluated for the 4I13/2→4I15/2 transitions. In comparisons with other Er3+ doped laser crystals, Er3+:LiGdF4 crystal has potential as a promising laser crystal.
Highlights
Diode-pumped solid-state lasers operating in the eye-safe spectral region around 1.5 μm have been of increasing interest in recent years, for a mass of application fields such as eye-safe compact devices for laser medical, environmental detection, laser radar, electro-optical jamming, remote sensing, optical communication and laser ranging [1,2,3]
The absorption and fluorescence spectra of Er3+:LiGdF4 crystal was measured at room temperature
The radiative transition probabilities, branching ratios, integrated emission cross-sections and radiative lifetimes of excited states of Er3+ in LiGdF4 were calculated In addition, The stimulated emission cross-sections for selected transitions were calculated
Summary
Diode-pumped solid-state lasers operating in the eye-safe spectral region around 1.5 μm have been of increasing interest in recent years, for a mass of application fields such as eye-safe compact devices for laser medical, environmental detection, laser radar, electro-optical jamming, remote sensing, optical communication and laser ranging [1,2,3]. During the last few years Er3+-doped materials have been widely investigated for possible laser applications, especially in spectral ranges around 1540 nm (4I13/2→4I15/2 ) , which have low in optical waveguide and are safe to human eyes [4]. 1.5 μm laser emission of Er3+ has been investigated in several hosts, both oxides [5,6] and fluorides [7,8]. Fluoride hosts possess a low phonon energy, lower emitted threshold, wide-in-wavelength transmission region, lower thermal effects [9,21], resulting in longer lifetimes with respect to oxide crystals, without significant decreasing of the emission cross section values. The results show that this crystal may be a preferable candidate for a tunable infrared laser media
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