Gold Mirror, Zerodur, 50.8 mm, λ/20, 650-20,000 nm

High-Performance Zerodur Metallic Mirrors

The 20Z40ER.4 Broadband Gold 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.4 protected gold coating is ideal for applications requiring broadband reflectance in the near IR to the far IR. A multilayer dielectric overcoat provides protection to the gold from the environment. The 20Z40ER.4 has an average reflectivity greater than 96% from 650-1700 nm and greater than 98% from 1.7-20 µm. This mirror has a λ/20 surface flatness and a 10-2 surface quality.

Specifications

Technical Specs

Wavelength Region
Broadband
Wavelength Range
650-20000 nm
Mirror Shape
Round
Diameter
50.8 mm
Mirror Size
Ø50.8 mm
Thickness
12.7 mm
Material
Zerodur^® or equivalent
Coating Type
Protected Gold
Coating Code
ER.4
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>92% @ 650-1700 nmR_avg>98%, R_min>96% @ 1.7-20 µm
Damage Threshold
0.5 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
650-20000 nm
Mirror Shape
Round
Diameter
50.8 mm
Mirror Size
Ø50.8 mm
Thickness
12.7 mm
Material
Zerodur^® or equivalent
Coating Type
Protected Gold
Coating Code
ER.4
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>92% @ 650-1700 nmR_avg>98%, R_min>96% @ 1.7-20 µm
Damage Threshold
0.5 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.4 RoHS Certificate(265.2 kB, PDF)
20Z40ER.4_ROHS2-2021.pdf(280.6 kB, PDF)
ER.4 Raw Data.xlsx(223.5 kB, XLSX)

2D Product Drawings

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

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