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1 Opto-Electronics Review

1 2001

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Spectral and generation characteristics of YAG:Nd³⁺ crystals with high concentration of Nd³⁺ ions

Mierczyk Z., Kopczyński K., Żendzian W., Łukasiewicz T.

Opto-Electronics Review

2001

Vol. 9, No. 1

83-90

The paper presents investigation results of optical, spectroscopic, and generation parameters of YAG:Nd³⁺ with higher concentration of Nd³⁺ ions (1.1–1.8 at. % Nd³⁺). YAG:Nd³⁺ single crystals were obtained by the Czochralski method. Investigations on optical quality were carried out using elastoscopic and interferometric methods. Absorption spectra within the spectral range of 200–3000 nm (∆ʎ = 1 nm) and pumping range of 750-850 nm (∆ʎ = 0.1 nm) were determined. Also the spectra of luminescence induced with radiation emitted by a laser diode of 808 nm were investigated and lifetime of Nd³⁺ ions in the upper laser level (⁴F₂/₃) was determined. In the all investigated crystals, doped up to 1.3 at.% Nd³⁺, the time of fluorescence decay from ⁴F₂/₃ level is 230 us. It was stated that high level of Nd³⁺ ions doping (above 1.33 at. % Nd³⁺) causes reduction of lifetime of the upper level ⁴F₂/₃ as a result of concentric quenching of luminescence. For the crystals of 1.8 at. % Nd³⁺ concentration, upper laser level lifetime has been educed to 183 us. Also the results of generation investigations obtained in a laser system with the examined YAG:Nd active media in form of side pumped "slabs" and inform of longitudinally pumped rod.