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.
Material Options & RoHS Compliant
9.5 mm - 100 mm
Available in different Thicknesses, Radius of Curvature, Focal Length
Super Broadband Working Wavelength
No Chromatic Aberration, Insensitive to Angle of Incidence & Polarization
Only for Low Power Application
f: Focal Length
tc: Center Thickness
te: Edge Thickness
ROC: Radius of Curvature
f=ROC/2
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)
◆ Reflectance Plot of Enhanced Aluminum Coating for Concave Mirror: Ravg > 90% over the 400 - 700 nm range
◆ Reflectance Plot of UV-protected Aluminum Coating for Concave Mirror: Ravg > 80% over the 250 - 700 nm range
◆ Reflectance Plot of Enhanced Silver Coating for Concave Mirror: Ravg > 98.5% over the 700 - 1100 nm range
◆ Reflectance Plot of Protected Gold Coating for Concave Mirror: Ravg > 98% over the 2000 - 12000 nm range
◆ Remarks: this recommended spectral range is narrower than the actual range over which the optic will be highly reflective