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Zerodur® Broadband Dielectric Mirrors


  • Lower Coefficient of Thermal Expansion Than Fused Silica
  • >99% Reflectance Over Specified Spectral Ranges
  • Four Broadband Coatings Available
  • Available in Ø1/2", Ø1", and Ø2" Sizes

BB0511-E02

Ø1/2" Mirror

BB111-E03

Ø1" Mirror

BB211-E04

Ø2" Mirror

BB111-E01

Ø1" Mirror

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Optical Coatings
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Features

  • Extremely Low Coefficient of Thermal Expansion
  • Four Broadband Coatings Available:
    • 350 - 400 nm
    • 400 - 750 nm
    • 750 - 1100 nm
    • 1280 - 1600 nm
  • Ravg > 99% for S- and P-Polarizations for Angles of Incidence from 0 to 45°
  • Available in Ø1/2", Ø1", and Ø2" Sizes
  • Designed for CW and Nanosecond Lasers

Zerodur®'s coefficient of thermal expansion is 0 ± 0.100 x 10-6 /°C, which is significantly smaller than the value for fused silica, 0.55 x 10-6 /°C. This property makes these mirrors ideal for high-power systems like industrial machining lasers, as well as other applications that are sensitive to thermally induced beam drift. These Zerodur mirrors are available with one of four broadband coatings which offer excellent reflectance over the 350 - 400 nm, 400 - 750 nm, 750 - 1100 nm or 1280 - 1600 nm wavelength ranges (see the plot below for a comparison at 8° AOI). Due to run-to-run coating variations, please note that the specified range listed for each coating is smaller than the actual spectral region over which the mirror is highly reflective. The plots shown under the Reflectance Plots tab show the performance characteristics of a typical mirror near the edges of its effective spectral range.

As seen in the photo to the right, the back of each mirror is engraved with its item number.

For applications which require broader reflective ranges and limited thermal expansion, Thorlabs also offers a line of metallic Zerodur mirrors. Customers can also purchase Zerodur® mirror blanks that do not have a mirror coating. For applications in which thermal expansion is not a concern, we also offer a line of standard broadband dielectric mirrors,  metallic mirrors and other mirrors suitable for a wide variety of applications.

Broadband Dielectric Mirror Coatings
Click to Enlarge
Raw Data
Comparison of Thorlabs' Broadband Dielectric HR Coatings
Mirror Specifications
Substratea Zerodur®
Surface Flatness λ/10 @ 632.8 nm (Peak to Valley)
Surface Quality 10-5 Scratch-Dig
Back Surface Fine Ground
Clear Aperture >85% of Diameter
Parallelism ≤3 arcmin
Thickness Ø1/2" Optics 6.0 mm (0.24")
Ø1" Optics 6.0 mm (0.24")
Ø2" Optics 12.0 mm (0.47")
Thickness Tolerance ±0.2 mm
Diameter Tolerance +0.0 mm / -0.1 mm
  • Click Link for Detailed Specifications on the Substrate

Coating Specifications
Item # Suffix -E01 -E02 -E03 -E04
Wavelength Range 350 - 400 nm 400 - 750 nm 750 - 1100 nm 1280 - 1600 nm
Reflectancea
(Click for Graph)
Rsand Rp >99% Rsand Rp >99% Rsand Rp >99% Rand Rp >99%
  • Click each link for a plot of the average unpolarized reflectance across the specified wavelength at 8° AOI. See the Graphs tab for additional plots.

These plots show the reflectance of each of our dielectric coatings offered with Zerodur for a typical coating run. The shaded region in each graph denotes the spectral range over which the coating is highly reflective. Due to variations in each run, this recommended spectral range is narrower than the actual range over which the optic will be highly reflective. If you have any concerns about the interpretation of this data, please contact Tech Support. For temperature-sensitive applications that require a mirror that bridges the spectral range between two dielectric coatings, please consider a Zerodur metallic mirror.

-E01 Coating (350 - 400 nm)

Excel Spreadsheet with Raw Data for -E01 Coating, 8° and 45° AOI

 

-E02 Coating (400 - 750 nm)

Excel Spreadsheet with Raw Data for -E02 Coating, 8° and 45° AOI

 

-E03 Coating (750 - 1100 nm)

Excel Spreadsheet with Raw Data for -E03 Coating, 8° and 45° AOI

 

-E04 Coating (1280 - 1600 nm)

Excel Spreadsheet with Raw Data for -E04 Coating, 8° and 45° AOI


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Ø1/2" Broadband Dielectric Mirrors

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
BB0511-E01 Support Documentation
BB0511-E01Ø1/2" (Ø12.7 mm) Zerodur® Broadband Dielectric Mirror, 350-400 nm
$129.22
Today
BB0511-E02 Support Documentation
BB0511-E02Ø1/2" (Ø12.7 mm) Zerodur® Broadband Dielectric Mirror, 400-750 nm
$91.14
Today
BB0511-E03 Support Documentation
BB0511-E03Ø1/2" (Ø12.7 mm) Zerodur® Broadband Dielectric Mirror, 750-1100 nm
$91.14
Today
BB0511-E04 Support Documentation
BB0511-E04Ø1/2" (Ø12.7 mm) Zerodur® Broadband Dielectric Mirror, 1280-1600 nm
$129.22
Today

Ø1" Broadband Dielectric Mirrors

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
BB111-E01 Support Documentation
BB111-E01Ø1" (Ø25.4 mm) Zerodur® Broadband Dielectric Mirror, 350-400 nm
$177.55
Today
BB111-E02 Support Documentation
BB111-E02Ø1" (Ø25.4 mm) Zerodur® Broadband Dielectric Mirror, 400-750 nm
$118.72
Today
BB111-E03 Support Documentation
BB111-E03Ø1" (Ø25.4 mm) Zerodur® Broadband Dielectric Mirror, 750-1100 nm
$118.72
Today
BB111-E04 Support Documentation
BB111-E04Ø1" (Ø25.4 mm) Zerodur® Broadband Dielectric Mirror, 1280-1600 nm
$177.55
Today

Ø2" Broadband Dielectric Mirrors

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
BB211-E01 Support Documentation
BB211-E01Ø2" (Ø50.8 mm) Zerodur® Broadband Dielectric Mirror, 350-400 nm
$343.55
Today
BB211-E02 Support Documentation
BB211-E02Ø2" (Ø50.8 mm) Zerodur® Broadband Dielectric Mirror, 400-750 nm
$267.90
Today
BB211-E03 Support Documentation
BB211-E03Ø2" (Ø50.8 mm) Zerodur® Broadband Dielectric Mirror, 750-1100nm
$267.90
Today
BB211-E04 Support Documentation
BB211-E04Ø2" (Ø50.8 mm) Zerodur® Broadband Dielectric Mirror, 1280-1600 nm
$343.55
5-8 Days
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