Abstract
In order to improve the output power of solar pumped fiber lasers, a new kind of transversely pumping configuration is proposed. The primary concentrator is an off-axis parabolic mirror array made up of ten fan-annular parabolic mirrors, and the secondary concentrator is a compound reflective concentrator composed of ten 3D compound parabolic concentrators (3D-CPCs) and a ring chamber. The collected sunlight passes through the 3D-CPCs’ inlet into the compound reflective concentrator which has a high reflecting film on the inner surface. An Nd-doped fiber is pumped when sunlight passes through the fiber core many times in the chamber. 490.8 W sunlight is absorbed by the fiber core according to ray tracing simulation. Based on solving the rate equation and the power transmission equation of the uniformly pumped solar fiber laser, 12.2 W laser output is obtained and the optical-to-optical conversion efficiency reaches 2.48 %. This solar concentrating system offers a new method to improve the output power of solar pumped fiber laser.
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