Aluminum Mirror, Zerodur, 50.8 mm, λ/20, 450-700 nm

High-Performance Zerodur Metallic Mirrors

The 20Z40ER.1 Broadband Aluminum 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.1 enhanced aluminum coating may be used wherever a broadband visible and near infrared reflector is needed. A multilayer dielectric stack deposited over the aluminum film boosts reflectance and improves the durability of the coating. The 20Z40ER.1 has an average reflectivity greater than 93% from 450-700 nm. This mirror has a λ/20 surface flatness and a 10-2 surface quality.

Specifications

Technical Specs

Wavelength Region
VIS
Wavelength Range
450-700 nm
Mirror Shape
Round
Diameter
50.8 mm
Mirror Size
Ø50.8 mm
Thickness
12.7 mm
Material
Zerodur^® or equivalent
Coating Type
Enhanced Aluminum
Coating Code
ER.1
Surface Quality
10-2 scratch-dig
Surface Flatness
λ/20 at 632.8 nm
Substrate Number
20Z40

Angle of Incidence
0-45°
Clear Aperture
≥central 80% of diameter
Back Surface
Ground
Reflectivity
R_avg>93%, R_min>90 % @ 450-700 nm
Damage Threshold
0.5 J/cm² with 10 ns pulses at 532 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
VIS
Wavelength Range
450-700 nm
Mirror Shape
Round
Diameter
50.8 mm
Mirror Size
Ø50.8 mm
Thickness
12.7 mm
Material
Zerodur^® or equivalent
Coating Type
Enhanced Aluminum
Coating Code
ER.1
Surface Quality
10-2 scratch-dig
Surface Flatness
λ/20 at 632.8 nm
Substrate Number
20Z40

Angle of Incidence
0-45°
Clear Aperture
≥central 80% of diameter
Back Surface
Ground
Reflectivity
R_avg>93%, R_min>90 % @ 450-700 nm
Damage Threshold
0.5 J/cm² with 10 ns pulses at 532 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.1 RoHS Certificate(265.4 kB, PDF)
20Z40ER.1_ROHS2-2021.pdf(281 kB, PDF)
ER.1 Raw Data.xlsx(237.2 kB, XLSX)

Related Products

Similar

Description	Compatibility	Price
20D20ER.1Aluminum Mirror, Borofloat, 50.8 mm, λ/10, 450-700 nm	UNIVERSAL	$167
20Z40ER.4Gold Mirror, Zerodur, 50.8 mm, λ/20, 650-20,000 nm	UNIVERSAL	$529
20Z40ER.2Silver Mirror, Zerodur, 50.8 mm, λ/20, 480-20,000 nm	UNIVERSAL	$517
20Z40AL.2UV Aluminum Mirror, Zerodur, 50.8 mm, λ/20, 250-600 nm	UNIVERSAL	$494

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