Dielectric Mirror, Broadband, 101.6 mm, 700-950 nm

Standard Borofloat 33 Dielectric Mirrors

The 40D20BD.2 Broadband Dielectric Mirror is an extremely versatile mirror for laboratory applications and highly efficient over a broad wavelength range. This 4 inch (101.6 mm) diameter mirror is made from a 17.7 mm thick Borofloat® 33 substrate. Borofloat® 33 has low thermal expansion and is an excellent substrate for most applications. Our BD.2 coating offers high reflectance for near infrared diode laser applications. The BD-2 coating is extremely durable and will withstand repeated cleaning. This mirror has a λ/10 surface flatness and a 20-10 surface quality.

Borofloat® 33 Substrates

Borofloat 33 is a high quality borosilicate glass that offers low thermal expansion and high thermal shock resistance. Its material properties and moderate cost make Borofloat 33 an ideal substrate for general purpose applications. For more information, please see our Optical Materials technical note.

NIR Broadband Dielectric Coating

Our BD.2 coating offers high reflectance for near infrared diode laser applications. Reflectivity is greater than 99% for s-polarization and 97% for p-polarization from 700 – 950 nm at 0 – 45° angle of incidence. Greater than 80% average reflectivity at 632.8 nm is also provided to permit easy alignment using a HeNe laser.

Specifications

Technical Specs

Wavelength Region
NIR
Wavelength Range
700-950 nm
Mirror Shape
Round
Diameter
101.6 mm
Mirror Size
Ø101.6 mm
Thickness
17.7 mm
Material
Borofloat® 33
Coating Type
Broadband Dielectric
Coating Code
BD.2
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
Rs (avg)>99%, Rp (ave)>97% @ 700-950 nm,R(avg)>80% at 632.8 nm
Damage Threshold
1000 W/cm² CW, 4 J/cm², 10 ns pulses, 10 Hz, at 800 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
NIR
Wavelength Range
700-950 nm
Mirror Shape
Round
Diameter
101.6 mm
Mirror Size
Ø101.6 mm
Thickness
17.7 mm
Material
Borofloat® 33
Coating Type
Broadband Dielectric
Coating Code
BD.2
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
Rs (avg)>99%, Rp (ave)>97% @ 700-950 nm,R(avg)>80% at 632.8 nm
Damage Threshold
1000 W/cm² CW, 4 J/cm², 10 ns pulses, 10 Hz, at 800 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

40D20BD.2 RoHS Certificate(262.9 kB, PDF)
40D20BD.2_ROHS2-2021.pdf(280.7 kB, PDF)
BD.2 Raw Data.xlsx(82.6 kB, XLSX)

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