Gold Mirror Pack, Economy, Borofloat, 50.8 mm, λ/10, 650-20,000 nm, Qty 10

This is a 10-pack of the Economy Broadband Gold 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.4 gold coating. Borofloat® 33 has low thermal expansion and is an excellent substrate for most applications. 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 20D620ER.4 has an average reflectivity greater than 96% from 650–1700 nm and greater than 98% from 1.7–20 μm. These mirrors have a λ/10 surface flatness and a 40-20 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
Borofloat® 33
Coating Type
Protected Gold
Coating Code
ER.4
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>92% @ 650-1700 nmR_avg>98%, R_min>96% @ 1.7-20 µm
Damage Threshold
0.5 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
650-20000 nm
Mirror Shape
Round
Diameter
50.8 mm
Mirror Size
Ø50.8 mm
Thickness
12.7 mm
Material
Borofloat® 33
Coating Type
Protected Gold
Coating Code
ER.4
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>92% @ 650-1700 nmR_avg>98%, R_min>96% @ 1.7-20 µm
Damage Threshold
0.5 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.4-PK RoHS Certificate(707.9 kB, PDF)
ER.4 Raw Data.xlsx(223.5 kB, XLSX)

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