The FSQ-ND25 UV Fused Silica Metallic Neutral Density Filter is a 50.8 x 50.8 mm square UV fused silica metallic ND filter with an optical density of 2.5 at 632.8 nm. Our metallic neutral density coatings provide broadband attenuation for lower power applications. The coating is deposited on one side of an ultra-pure UV grade fused silica substrate providing excellent transmission from the UV to near-infrared. All filters are permanently marked with the optical density.

• 尺寸

  50.8 x 50.8 mm

• 光学密度

  2.5

• 光学密度公差

  ±4%

• 波长范围

  350 - 2000 nm

• 材料

  UV grade fused silica

• 入射角

  0°

• 楔形

  ≤3 arc min

• 透射

  0.3 % at 632.8 nm

• 耐用性

  MIL-C-48497A, adhesion, humidity, moderate abrasion, and solubility requirements

• 表面平面度

  ≤2λ at 632.8 nm over the clear aperture

• 表面质量

  60-40 scratch-dig

• 倒角

  0.25–0.76 mm face width

• 倒角公差

  45° ±15°

• 清洁

  See How to Clean Optics

• 通光孔径

  ≥central 80% of dimensions

• 损伤阈值

  30 W/cm2 CW, typical; not recommended for pulsed laser use

• 厚度

  3.0 mm

• 厚度公差

  ±0.25 mm

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FSQ-ND25 UV熔凝石英金属中性密度滤光片为50.8 x 50.8 mm平方UV熔凝石英金属ND滤光片，在632.8 nm处的光密度为2.5。我们的金属中性密度涂层为低功率应用提供宽带衰减。涂层沉积在超纯紫外级熔融二氧化硅衬底的一侧，提供从紫外到近红外的优良传输。所有的滤光片都永久性地用光密度标记。