Elliptical Mirror, Silver, Borofloat, 46.7 x 66 mm, λ/10, 480-20,000 nm

The 18E20ER.2 Broadband Silver Elliptical Mirror is an excellent general purpose, broadband reflector. This 46.70 mm (1.838 inch) minor axis, 66.04 mm (2.60 inch) major axis, elliptical mirror is made from a 12.45 mm thick Borofloat® 33 substrate. 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 18E20ER.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/10 surface flatness and a 15-5 surface quality.

Specifications

Technical Specs

Wavelength Region
Broadband
Wavelength Range
480-20000 nm
Mirror Shape
Elliptical
Mirror Size
66.0 x 46.7 mm
Thickness
12.5 mm
Material
Borofloat® 33
Coating Type
Protected Silver
Coating Code
ER.2
Surface Quality
15-5 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 with 10 ns pulses at 1064 nm, 20Hz
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
Elliptical
Mirror Size
66.0 x 46.7 mm
Thickness
12.5 mm
Material
Borofloat® 33
Coating Type
Protected Silver
Coating Code
ER.2
Surface Quality
15-5 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 with 10 ns pulses at 1064 nm, 20Hz
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

3D Product Models

Download CAD Files

Other

18E20ER.2 RoHS Certificate(263.6 kB, PDF)
18E20ER.2_ROHS2-2021.pdf(281.6 kB, PDF)
ER.2 Raw Data.xlsx(205.4 kB, XLSX)

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