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Neutral Density Filter
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中性密度光学滤光片
用在宽辐照度范围下呈比例衰减，分离或组合光束，而不影响波长。宽带使用，衰减随波长变化，低功率。镀金属膜：宽带使用，波长均匀衰减，低功耗。
中性密度光学滤光片镀电介质膜：窄带使用，衰减; 高激光损伤阈值 。波长从250nm-2550nm，表面质量80-50，镜片材料：熔融石英或BK7。表面光洁度：≤ 3λ per 25-mm area。