Improvement in solar-pumped Nd:YAG laser beam brightness |
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Authors: | J. Almeida D. Liang E. Guillot |
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Affiliation: | 1. CEFITEC, Departamento de Física, FCT, Universidade Nova de Lisboa, 2829-516 Campus de Caparica, Portugal;2. PROMES-CNRS, 7 rue du Four Solaire, 66120, Font Romeu, Odeillo, France |
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Abstract: | Solar-pumped solid-state lasers are promising for renewable extreme-temperature material processing. Here we report a large improvement in solar laser beam brightness by pumping a thin Nd:YAG single crystal rod. A fused silica light guide of 14 mm×22 mm rectangular cross-section is used to both transmit and homogenize the concentrated solar radiation from the focal zone of a 2.88 m2 parabolic mirror to the entrance aperture of a modified 2D-CPC flooded pump cavity, within which a 4 mm diameter rod is efficiently pumped. 2.2% slope efficiency is reached. Laser beam brightness figure of merit B is three times higher than that of the most recent solar-pumped Nd:YAG laser by a Fresnel lens. The introduction of the rectangular cross-section light guide has also ensured a much more stable laser emission than previous pumping schemes. |
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