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Spherical Concave Optical Mirrors with Dielectric Coatings

Concave Mirrors are designed for light collection, imaging, and focusing applications. These reflective optics focus light without introducing chromatic aberration, making them especially suitable for broadband sources.

Paralight Optics offers concave mirrors with both metallic and dielectric reflective coatings. Metallic mirrors offer relatively high reflectivity (90-95%) over a wide wavelength range, while dielectric-coated mirrors provide even higher reflectivity (>99.5%) but over a smaller wavelength range.

Metallic concave mirrors are available with focal lengths from 9.5 – 1000 mm, while dielectric concave mirrors are available with focal lengths from 12 – 1000 mm. Broadband dielectric concave mirrors are available for use with light in the UV, VIS, and IR spectral regions. For further information on coatings, please check the following Graphs for your references.

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Features:

Material Compliant:

RoHS Compliant

Focal Lengths Ranges:

25 mm - 100 mm, 12 mm - 1000 mm

Coating Options:

Uncoated or Dielectric HR coated

High Reflectivity:

Ravg >99.5% in Dielectric Coating Range

Optical Performance:

No Chromatic aberration

Laser Damage Quantification Test:

High Laser Damage Threshold

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Common Specifications:

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f: Focal Length
tc: Center Thickness
te: Edge Thickness
ROC: Radius of Curvature
f=ROC/2

Parameters

Ranges & Tolerances

  • Substrate Material

    N-BK7 (CDGM H-K9L)

  • Type

    Broadband Dielectric Concave Mirror

  • Diameter

    1/2'' / 1'' / 2'' / 75 mm

  • Diameter Tolerance

    +0.00/-0.20mm

  • Thickness Tolerance

    +/-0.20 mm

  • Centration

    < 3 acrmin

  • Clear Aperture

    >90% of Diameter

  • Surface Quality (Scratch-Dig)

    60-40

  • Surface Irregularity

    < 3 λ/4 at 632.8 nm

  • Surface Flatness

    < λ/4 at 632.8 nm

  • Coatings

    Dielectric HR coating on curved surface, Ravg > 99.5%

  • Backside Options

    Available either unpolished, polished or dielectric coated

  • Laser Damage Threshold

    5 J/cm2 (20 ns, 20 Hz, @1.064 μm)

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Graphs

◆ Reflectance plot for dielectric coated concave mirror: Ravg > 99.5% over the 315 - 532 nm range, this recommended spectral range is narrower than the actual range over which the optic will be highly reflective
◆ Reflectance plot for dielectric coated concave mirror: Ravg > 99.5% over the 1028 - 1080 nm range, this recommended spectral range is narrower than the actual range over which the optic will be highly reflective

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Reflectance Curve of Dielectric Coated Mirror (Ravg > 99.5% over the 1028 - 1080 nm range)

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