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Development of solar concentrators for high-power solar-pumped lasers

机译：开发用于大功率太阳能泵浦激光器的太阳能集中器

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摘要

We have developed unique solar concentrators for solar-pumped solid-state lasers to improve both efficiency and laser output power. Natural sunlight is collected by a primary concentrator which is a 2 m × 2 m Fresnel lens, and confined by a cone-shaped hybrid concentrator. Such solar power is coupled to a laser rod by a cylinder with coolant surrounding it that is called a liquid light-guide lens (LLGL). Performance of the cylindrical LLGL has been characterized analytically and experimentally. Since a 14 mm diameter LLGL generates efficient and uniform pumping along a Nd:YAG rod that is 6 mm in diameter and 100 mm in length, 120 W cw laser output is achieved with beam quality factor M~2 of 137 and overall slope efficiency of 4.3%. The collection efficiency is 30.0 W/m~2, which is 1.5 times larger than the previous record. The overall conversion efficiency is more than 3.2%, which can be comparable to a commercial lamp-pumped solid-state laser. The concept of the light-guide lens can be applied for concentrator photovoltaics or other solar energy optics.
机译：我们开发了用于太阳能泵浦固态激光器的独特太阳能集中器，以提高效率和激光输出功率。自然光由一个2 m×2 m菲涅耳透镜的主聚光器收集，并由一个锥形混合聚光器限制。这种太阳能通过汽缸与激光棒耦合，汽缸周围带有冷却剂，称为液体导光透镜（LLGL）。圆柱形LLGL的性能已通过分析和实验表征。由于直径为14毫米的LLGL沿直径为6毫米，长度为100毫米的Nd：YAG棒产生有效且均匀的泵浦，因此可实现120 W cw激光输出，光束质量因数M〜2为137，总斜率为4.3％。收集效率为30.0 W / m〜2，是以前的记录的1.5倍。总体转换效率超过3.2％，可以与商用灯泵浦固态激光器媲美。导光透镜的概念可以应用于聚光光伏或其他太阳能光学器件。

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