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可调谐空间光学衰减器在各类光电系统中具有广泛的应用前景。基于法布里-珀罗多光束干涉原理,创新性地设计了一种适用于相干光束的可调谐空间光学衰减器,该衰减器选取在红外波段具有较高折射率的硒化锌晶体作为材料,结合温度控制系统,实现光功率的调谐。采用Nd:YAG激光器作为光源,对该衰减器的性能进行测量,其调谐范围可以达到3 d B。理论分析表明,相对于热膨胀系数,硒化锌材料的热光系数是决定衰减器性能的关键参量。此外,通过在硒化锌光学平板前后表面镀高反膜,可进一步提高调谐范围。
Tunable space optical attenuator in a variety of photovoltaic systems has a wide range of applications. Based on the Fabry-Perot multi-beam interference principle, a tunable spatial optical attenuator for coherent light beam is designed innovatively. The attenuator selects zinc selenide crystals with high refractive index in the infrared band as the material , Combined with temperature control system to achieve optical power tuning. The Nd: YAG laser is used as the light source to measure the performance of the attenuator, and its tuning range can reach 3 dB. Theoretical analysis shows that relative to the thermal expansion coefficient, the thermal coefficient of zinc selenide material is to determine the key parameters of the performance of the attenuator. In addition, the surface of the Zinc selenide optical plate coated with high anti-film, can further improve the tuning range.