Aluminum Mirror, Economy, Borofloat, 50.8 mm Square, λ/10, 450-700 nm

Economy Square Broadband Metallic Mirrors

The 20SD520ER.1 is an Economy Broadband Aluminum Square Mirror. By taking advantage of advanced polishing techniques and our high-volume manufacturing, these mirrors are truly cost effective. This 50.8 x 50.8 mm (2.0 x 2.0 inch) square mirror is made from 12.0 mm thick Borofloat® 33 substrate which is coated with the ER.1 aluminum coating. Borofloat® 33 has low thermal expansion and is an excellent substrate for most applications. 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 20SD520ER.1 has an average reflectivity greater than 93% from 450–700 nm. This mirror has a λ/10 surface flatness and a 60-40 surface quality.

Specifications

Technical Specs

Wavelength Region
VIS
Wavelength Range
450-700 nm
Mirror Shape
Square
Mirror Size
50.8 x 50.8 mm
Thickness
12.7 mm
Material
Borofloat® 33
Coating Type
Enhanced Aluminum
Coating Code
ER.1
Surface Quality
60-40 scratch-dig
Surface Flatness
λ/10 at 632.8 nm
Substrate Number
20SD520
Angle of Incidence
0-15°

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, 10 ns pulses , 20 Hz at 532 nm
Size 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
Square
Mirror Size
50.8 x 50.8 mm
Thickness
12.7 mm
Material
Borofloat® 33
Coating Type
Enhanced Aluminum
Coating Code
ER.1
Surface Quality
60-40 scratch-dig
Surface Flatness
λ/10 at 632.8 nm
Substrate Number
20SD520
Angle of Incidence
0-15°

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, 10 ns pulses , 20 Hz at 532 nm
Size 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

20SD520ER.1 RoHS Certificate(266.1 kB, PDF)
20SD520ER.1_ROHS2-2021.pdf(282 kB, PDF)
ER.1 Raw Data.xlsx(237.2 kB, XLSX)

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