Side-pumped continuous-wave Cr:Nd:YAG ceramic solar laser |
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Authors: | D. Liang J. Almeida E. Guillot |
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Affiliation: | 1. CEFITEC, Departamento de Física, FCT, Universidade Nova de Lisboa, Campus de Caparica, 2829-516, Caparica, Portugal 2. PROMES-CNRS, 7 rue du Four Solaire, 66120, Font Romeu-Odeillo-Via, France
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Abstract: | To clarify the advantages of Cr:Nd:YAG ceramics rods in solar-pumped lasers, a fused silica light guide with rectangular cross-section is coupled to a compound V-shaped cavity within which a 7 mm diameter 0.1 at.% Cr:1.0 at.% Nd:YAG ceramic rod is uniformly pumped. The highly concentrated solar radiation at the focal spot of a 2 m diameter stationary parabolic mirror is transformed into a uniform pump radiation by the light guide. Efficient pump light absorption is achieved by pumping uniformly the ceramic rod within the V-shaped cavity. Optimum pumping parameters and solar laser output powers are found through ZEMAX© non-sequential ray-tracing and LASCAD© laser cavity analysis codes. 33.6 W continuous-wave laser power is measured, corresponding to 1.32 times enhancement over our previous results with a 4 mm diameter Nd:YAG single-crystal rod. High slope efficiency of 2.6 % is also registered. The solar laser output performances of both the ceramic and the single-crystal rods are finally compared, revealing the relative advantage of the Cr:Nd:YAG rod in conversion efficiency. Low scattering coefficient of 0.0018 cm?1 is deduced for the ceramic rod. Heat load is considered as a key factor affecting the ceramic laser output performance. |
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