Spherical Concave Optical Mirrors with Metallic 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 metal-coated 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.

Features:

Substrate Options:

Material Options & RoHS Compliant

Focal Lengths Ranges:

9.5 mm - 100 mm

Custom Options:

Available in different Thicknesses, Radius of Curvature, Focal Length

Wavelength Ranges:

Super Broadband Working Wavelength

Optical Performance:

No Chromatic Aberration, Insensitive to Angle of Incidence & Polarization

Applications:

Only for Low Power Application

Common Specifications:

pro-related-ico — f: Focal Length
t_c: Center Thickness
t_e: Edge Thickness
ROC: Radius of Curvature
f=ROC/2

Parameters

Ranges & Tolerances

Substrate Material

N-BK7 (CDGM H-K9L) or other substrate
Type

Broadband Metallic 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

Metallic coating on curved surface
Enhanced Aluminum: Ravg > 90% @ 400-700nm
Protected Aluminum: Ravg > 87% @ 400-1200nm
UV Protected Aluminum: Ravg >80% @ 250-700nm
Protected Silver: Ravg>95% @400-12000nm
Enhanced Silver: Ravg>98.5% @700-1100nm
Protected Gold: Ravg>98% @2000-12000nm
Flat Surface of Backside Options

Available either unpolished, finely polished or coated as request
Laser Damage Threshold

1 J/cm² (20 ns, 20 Hz, @1.064 μm)