Gold Mirror, Borofloat, 101.6 mm, λ/10, 650-20,000 nm

The 40D20ER.4 Broadband Gold Mirror is an excellent general purpose, broadband reflector. This 101.6 mm (4.0 inch) diameter mirror is made from a 17.7 mm thick Borofloat® 33 substrate which is 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 40D20ER.4 has an average reflectivity greater than 96% from 650–1700 nm and greater than 98% from 1.7–20 μm. This mirror has a λ/10 surface flatness and a 15-5 surface quality.

Specifications

Technical Specs

Wavelength Region
Broadband
Wavelength Range
650-20000 nm
Mirror Shape
Round
Diameter
101.6 mm
Mirror Size
Ø101.6 mm
Thickness
17.7 mm
Material
Borofloat® 33
Coating Type
Protected Gold
Coating Code
ER.4
Surface Quality
20-10 scratch-dig
Surface Flatness
λ/10 at 632.8 nm
Substrate Number
40D20

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 with 10 ns pulses at 1064 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
Broadband
Wavelength Range
650-20000 nm
Mirror Shape
Round
Diameter
101.6 mm
Mirror Size
Ø101.6 mm
Thickness
17.7 mm
Material
Borofloat® 33
Coating Type
Protected Gold
Coating Code
ER.4
Surface Quality
20-10 scratch-dig
Surface Flatness
λ/10 at 632.8 nm
Substrate Number
40D20

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 with 10 ns pulses at 1064 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

3D Product Models

Download CAD Files

Other

40D20ER.4 RoHS Certificate(264.9 kB, PDF)
40D20ER.4_ROHS2-2021.pdf(280.2 kB, PDF)
ER.4 Raw Data.xlsx(223.5 kB, XLSX)

Related Products

Similar

Description	Compatibility	Price
40D20ER.2Silver Mirror, Borofloat, 101.6 mm, λ/10, 480-20,000 nm	UNIVERSAL	$1,100
40D20BD.2Dielectric Mirror, Broadband, 101.6 mm, 700-950 nm	UNIVERSAL	$1,383
13E20ER.4Elliptical Mirror, Gold, Borofloat, 33 mm x 46.7 mm, λ/10, 650-20,000 nm	UNIVERSAL	$215

Compatible

	Compare	Description	Compatibility	Drawings, CAD & Specs	Avail.	Price
		U400-AC3KMirror Mount, ULTIMA^®, Center, 4.0 in., 3 Locking Knob Adjustment	UNIVERSAL		FREE 2-day shipping on thousands of products on Newport.com Learn More	$626
		SL101.6BMGimbal Optical Mount, 4.0 in., (2) BM Micrometers	UNIVERSAL		FREE 2-day shipping on thousands of products on Newport.com Learn More	$1,990

Product Comparison