20Z40ER.2 Silver Mirror

The 20Z40ER.2 Broadband Silver Mirror is an excellent general purpose, broadband reflector. This 50.8 mm (2.0 inch) diameter mirror is made from a 12.7 mm thick Zerodur substrate. Zerodur, a glass-ceramic material, exhibits nominally zero thermal expansion which provides extra stability for applications requiring diffraction limited performance. 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. The 20Z40ER.2 has an average reflectivity greater than 96% from 480-1100 nm and greater than 98.5% from 1.1-20 µm. This mirror has a λ/20 surface flatness and a 10-2 surface quality.

Specifications

Technical Specs

Wavelength Region
Broadband
Wavelength Range
480-20000 nm
Mirror Shape
Round
Diameter
50.8 mm
Mirror Size
Ø50.8 mm
Thickness
12.7 mm
Material
Zerodur^® or equivalent
Coating Type
Protected Silver
Coating Code
ER.2
Surface Quality
10-2 scratch-dig
Surface Flatness
λ/20 at 632.8 nm
Angle of Incidence
0-45°

Clear Aperture
≥central 80% of diameter
Back Surface
Ground
Reflectivity
R_avg>96%, R_min>93% @ 480-1100 nm;R_avg>98.5%, R_min>97% @ 1.1-20 µm
Damage Threshold
1 J/cm² with 10 ns pulses at 1064 nm, 20Hz
Diameter Tolerance
+0/-0.13 mm
Thickness Tolerance
±0.25 mm
Chamfers
0.38–1.14 mm face width
Chamfers Angle Tolerance
45° ±15°
Cleaning
See How to Clean Optics

Wavelength Region
Broadband
Wavelength Range
480-20000 nm
Mirror Shape
Round
Diameter
50.8 mm
Mirror Size
Ø50.8 mm
Thickness
12.7 mm
Material
Zerodur^® or equivalent
Coating Type
Protected Silver
Coating Code
ER.2
Surface Quality
10-2 scratch-dig
Surface Flatness
λ/20 at 632.8 nm
Angle of Incidence
0-45°

Clear Aperture
≥central 80% of diameter
Back Surface
Ground
Reflectivity
R_avg>96%, R_min>93% @ 480-1100 nm;R_avg>98.5%, R_min>97% @ 1.1-20 µm
Damage Threshold
1 J/cm² with 10 ns pulses at 1064 nm, 20Hz
Diameter Tolerance
+0/-0.13 mm
Thickness Tolerance
±0.25 mm
Chamfers
0.38–1.14 mm face width
Chamfers Angle Tolerance
45° ±15°
Cleaning
See How to Clean Optics

Resources & Downloads

Other

20Z40ER.2 RoHS Certificate(265.7 kB, PDF)
20Z40ER.2_ROHS2-2021.pdf(280.8 kB, PDF)
ER.2 Raw Data.xlsx(205.4 kB, XLSX)

2D Product Drawings

10Z and 20Z Zerodur Mirror Drawing(103.8 kB, PDF)

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Silver Mirror, Zerodur, 50.8 mm, λ/20, 480-20,000 nm

Model: 20Z40ER.2

Product Series Overview