Features

• Protected Silver: 450 nm - 20 µm
• Four Diameter Options: 1/2", 1", 2", or 75 mm
• Focal Lengths Range from 9.5 mm - 1000 mm

Thorlabs' Protected Silver-Coated Concave Mirrors are designed for light collection, imaging, and focusing applications. These reflective optics focus light without chromatic aberration, making them especially suitable for broadband sources. 

These mirrors consist of a silver-coated N-BK7 substrate that features a protective SiO₂ overcoat. They offer >95% average reflectance in the spectral range from 2 - 20 µm and >97% average reflectance in the spectral range from 450 nm - 2 µm. For applications near 780 nm, protected silver mirrors are significantly better than protected aluminum mirrors. With ≤λ/4 surface irregularity at 633 nm, these mirrors provide excellent image quality. 

All of the mirrors on this page can be mounted by our Precision Kinematic Mirror Mounts.

Due to their high reflectance over the 450 nm - 20 µm range, these mirrors are also well suited for use with femtosecond pulsed lasers. For our full selection of optics for ultrafast applications, please see the Ultrafast Optics tab.

Please contact Tech Support for custom versions of these optics. Thorlabs also offers dielectric concave mirrors that provide higher reflectivity than metal mirrors at the expense of operating over a more narrow wavelength range.

Care and Handling
Silver coated mirrors require additional care due to their susceptibility to damage from environmental conditions and improper handling. Fingerprints, contact with abrasive surfaces, and environments with high humidity or temperature will diminish the effectiveness of the protective overcoat leaving the silver coating susceptible to oxidation and degradation. When working with silver mirrors, follow standard practices for handling optics. Latex gloves or similar protective coverings are recommended to prevent oil and other residues on the user’s fingers from reaching the optical surface. Even with such precautions, care should be taken not to touch the mirrored face or edges. Silver mirrors should be used and stored in areas at room temperature with minimal humidity. For information on how to clean mirrors and other optics, visit our Optic Cleaning Tutorial.

The shaded regions in the graphs denote the range over which we guarantee the specified reflectance. Please note that the reflectance outside of this band can vary from lot to lot, especially in out-of-band regions where the reflectance is fluctuating or sloped.

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Excel Spreadsheet with Raw Data for -P01 Protected Silver Coating

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Excel Spreadsheet with Raw Data for -P01 Protected Silver Coating

Thorlabs offers a wide selection of optics optimized for use with femtosecond and picosecond laser pulses. Please see below for more information.

Low-GDD Mirrors
355 - 445 nm	460 - 590 nm	700 - 930 nm	970 - 1150 nm	1400 - 1700 nm	1760 - 2250 nm

Dielectric Mirror	High-Power Mirrors for Picosecond Lasers	Metallic Mirrors			Low-GDD Pump-Through Mirrors
Dual-Band Dielectric Mirror, 400 nm and 800 nm	Ytterbium Laser Line Mirrors, 250 nm - 1080 nm	Ultrafast-Enhanced Silver Mirrors, 750 - 1000 nm	Protected Silver Mirrors, 450 nm - 20 µm	Unprotected Gold Mirrors, 800 nm - 20 µm	Pump-Through Mirrors, 1030 - 1080 nm and 940 - 980 nm

Deterministic GDD Beamsplitters	Low-GDD Harmonic Beamsplitters	Low-GDD Polarizing Beamsplitters	β-BBO Crystals	Dispersion-Compensating Optics
Beamsplitters & Windows, 600 - 1500 nm or 1000 - 2000 nm	Harmonic Beamsplitters, 400 nm and 800 nm or 500 nm and 1000 nm	High-Power, Broadband, High Extinction Ratio Polarizers, 700 - 1300 nm	β-BBO Crystals for Second Harmonic Generation	Dispersion-Compensating Mirrors, 650 - 1050 nm	Dispersion-Compensating Prisms, 700 - 900 nm

Click on a particular graphed line or the corresponding name in the legend to view concave mirrors with that coating option.
Metallic-Coated Concave Mirrors are available in UV Enhanced Aluminum, Aluminum, Silver, and Gold.

Concave Dielectric Coated Mirrors

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Reflectance of -E01 Dielectric-Coated Concave Mirrors at 6° AOI.

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Reflectance of -E02 Dielectric-Coated Concave Mirrors at 8° AOI.
These mirrors are also available with a Back Side Polish.

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Reflectance of -E04 Dielectric-Coated Concave Mirrors at 6° AOI.

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Reflectance of -E03 Dielectric-Coated Concave Mirrors at 6° AOI.
These mirrors are also available with a Back Side Polish.

Concave Crystalline Coating Mirrors 

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