Abstract
ABSTRACT We have designed a Nd:YAG laser to be pumped by the High-Flux Solar Furnace(HFSF) at the NationalRenewable Energy Laboratory. Based on the unique features ofthe HFSF, the design objectives arehigh brightness and superior efficiency in primary mirror area utilization. The HFSF has a primarymirror of 1 1 .5 m2 and a 1 85 f-number. With such a high f-number, the target is set off-axis and do notblock incoming solar flux. Moreover, large f-number enables concentration which approaches thetheoretical limit, and a two-dimensional non-imaging concentrator deposits the solar flux onto theinternal part ofa 10mm diameter laser rod. For high brightness, we plan a wide low-loss fundamentalmode and a laser rod aperture that suppresses high order modes. To get a fundamental mode, ofup toa 2.5 mm waist, we have designed a convex-concave resonator, following well-known g1g2=O.5 designfor resonators with internal beam focusing. We have used the edge ray principle to design theconcentrator, and ray traced the deposited power inside the laser rod. A 1.3% Nd doping levelsupports a maximal power deposition inside a 5mm diameter.Keywords: solar, brightness, furnace, non-imaging, resonator, convex-concave, thermal lensing.
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