Polycrystalline infrared (PIR) fibers are used for numerous applications, one of those being power delivery for CO₂ −lasers. However, the fiber tip surface’s transmittance cannot be increased with conventional antireflection coatings due to the surface unevenness. Antireflection microstructures (ARMs) offer an alternative way of increasing transmittance. In this work, ARMs were fabricated on the fiber tip surface of an AgClBr fiber by single-pulse femtosecond laser ablation. A single-surface transmittance of 92.8% at 10.6 µm, a CO₂ −laser operation wavelength, was achieved. The proposed method can help significantly improve the systems’ efficiency, where power delivery for CO₂ −lasers or sources operating in the wide wavelength range is required.

中文翻译：

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单脉冲飞秒激光烧蚀在AgClBr多晶纤维上制备抗反射微结构

多晶红外（PIR）光纤可用于多种应用，其中之一是为CO ₂激光器提供功率。然而，由于表面不平整，常规的抗反射涂层不能提高纤维尖端表面的透射率。抗反射微结构（ARM）提供了增加透射率的另一种方法。在这项工作中，通过单脉冲飞秒激光烧蚀在AgClBr纤维的纤维尖端表面上制造了ARM。在10.6 µm（CO ₂激光操作波长）下，单面透射率为92.8％。所提出的方法可以帮助显着提高系统效率，其中需要为在宽波长范围内工作的CO ₂激光器或光源供电。