The 20D20ER.2 Broadband Metallic Mirror is an excellent general purpose, broadband reflectors. This 2 inch (50.8 mm) diameter mirror is made from a 12.7 mm thick Borofloat® 33 substrate. Borofloat® 33 has low thermal expansion and is an excellent substrate for most applications. The ER.2 protected silver coating is composed of a low emissivity silver film fully encapsulated by a multilayer dielectric stack to prevent oxidation. This coating has excellent broadband reflectivity in the IR, while maintaining very good performance in the visible and near IR. Average reflectivity is greater than 96% from 480–1100 nm and greater than 98.5% from 1.1–20 μm. This mirror has a λ/10 surface flatness and a 15-5 surface quality.

• 波长区域

  Broadband

• 波长范围

  480-20000 nm

• 镜片形状

  Round

• 镜片尺寸

  Ø50.8 mm

• 材料

  Borofloat® 33

• 镀膜类型

  Protected Silver

• 镀膜代码

  ER.2

• 表面质量

  15-5 scratch-dig

• 表面平面度

  λ/10 at 632.8 nm

• 入射角

  0-45°

• 通光孔径

  ≥central 80% of diameter

• S2 表面

  Ground

• 反射率

  Ravg>96%, Rmin>93% @ 480-1100 nm;Ravg>98.5%, Rmin>97% @ 1.1-20 µm

• 损伤阈值

  1 J/cm² with 10 ns pulses at 1064 nm, 20Hz

• 厚度

  12.7 mm  

• 厚度公差

  ±0.25 mm

• 直径

  50.8 mm  

• 直径公差

  +0/-0.13 mm

• 倒角

  0.38–1.14 mm face width

• 倒角公差

  45° ±15°

• 清洁

  See How to Clean Optics

20 d20开头。2 .宽频金属镜是一种优良的通用宽频反射镜。这个2英寸(50.8毫米)直径镜子是用12.7毫米厚Borofloat®33衬底。Borofloat®33有低的热膨胀和是一个很好的衬底对于大多数应用程序。2 .受保护的银镀层由低发射率的银膜组成，该银膜被多层介质堆叠完全包裹，以防止氧化。该涂层在红外光谱中具有良好的宽带反射率，同时在可见光和近红外光谱中保持了良好的性能。平均反射率大于96%在480 - 1100海里,从-20年1.1μm大于98.5%。这个镜子λ/今天比赛10表面平面度和表面质量。