20D620ER.2-PK Silver Mirror Pack

This is a 10-pack of the Economy Broadband Silver Mirrors. By taking advantage of advanced polishing techniques and our high-volume manufacturing, these mirrors are truly cost effective. These 50.8 mm (2.0 inch) diameter mirrors are made from 12.7 mm thick Borofloat® 33 substrate and are coated with the ER.2 silver coating. Borofloat® 33 has low thermal expansion and is an excellent substrate for most applications. Our 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 20D620ER.2 has an average reflectivity greater than 96% from 480–1100 nm and greater than 98.5% from 1.1–20 μm. These mirrors have a λ/10 surface flatness and a 40-20 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
Borofloat® 33
Coating Type
Protected Silver
Coating Code
ER.2
Surface Quality
40-20 scratch-dig
Surface Flatness
λ/10 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, 10 ns pulses , 20 Hz at 1064 nm
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
Borofloat® 33
Coating Type
Protected Silver
Coating Code
ER.2
Surface Quality
40-20 scratch-dig
Surface Flatness
λ/10 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, 10 ns pulses , 20 Hz at 1064 nm
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

20D620ER.2-PK RoHS Certificate(707.9 kB, PDF)
ER.2 Raw Data.xlsx(205.4 kB, XLSX)

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Silver Mirror Pack, Economy, Borofloat, 50.8 mm, λ/10, 480-20,000 nm, Qty 10

Model: 20D620ER.2-PK

Product Series Overview