Abstract
A significant progress in TEM00-mode solar laser power and efficiency with heliostat–parabolic mirror system is reported here. A double-stage light-guide/2V-shaped pump cavity is used to efficiently couple and redistribute the concentrated pump light from a 2-m-diameter parabolic mirror to a 4-mm-diameter, 30-mm-length, 1.1 at.% Nd:YAG single-crystal rod. The light guide with large rectangular cross section enables a stable uniform pum** profile along the laser rod, resulting also in an enhanced tracking error compensation capacity. 5.5 W cw TEM00-mode solar laser power was measured at the output of a thermally near unstable asymmetric resonator. 150 and 157 % improvement in TEM00-mode solar laser collection efficiency and slope efficiency were obtained, respectively.
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Acknowledgements
This research Project (No. PTDC/FIS/122420/2010) is funded by the Science and Technology Foundation of Portuguese Ministry of Science, Technology and Higher Education (FCT-MCTES). Financial support by the Access to Research Infrastructures Activity in the 7th Framework Program of the EU (SFERA2 Grant Agreement No. 312643) is gratefully acknowledged. The fellowship Grant SFRH/BD/90410/2012 of Joana Almeida is also acknowledged.
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R. Bouadjemine is on leave from Division of Ionized Gases and Lasers, Centre for Development of Advanced Technology CDTA BP, Baba Hassan, Algiers, Algeria, 16000.
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Almeida, J., Liang, D., Vistas, C.R. et al. 5.5 W continuous-wave TEM00-mode Nd:YAG solar laser by a light-guide/2V-shaped pump cavity. Appl. Phys. B 121, 473–482 (2015). https://doi.org/10.1007/s00340-015-6257-z
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DOI: https://doi.org/10.1007/s00340-015-6257-z