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Ultra-broadband Metallic Mirrors
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High reflectance over a broad spectral range
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Enhanced reflectance in the visible range
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Effective over wide angles of incidence
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Standard diameters from 12.7 to 50.8mm
These mirrors provide a high reflectance over a very broad spectral bandwidth. They are manufactured by coating first with a reflective metal film and then with a dielectric overcoat for protection and enhancement of the reflectivity. Coatings offered include aluminum, silver and gold. Each has a different spectral characteristic as shown in the curves. Aluminum provides a good general purpose visible range mirror. Silver has a very high reflectance over the visible and near infra-red range and gold is the preferred coating for infra-red applications at wavelengths greater than 2 microns. We use only highly polished laser grade substrates with λ/10 surfaces and low scatter. Unlike dielectric coatings, these mirrors can be used over a wide range of angles of incidence. However, they do affect the state of polarization of the reflected beam.
Standard sizes are 1/2 inch, 3/4 inch, 1 inch and 2 inches in diameter - other shapes and sizes are available on request.
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| Type (mm) | Diameter (mm) | Thickness (mm) | Material | Wavelength Range (nm) | Reflectance (%) | Angle of Incidence ( ) | Flatness | Surface Quality | Parallelism tolerance | Clear Aperture | Diameter tolerance | Thickness tolerance | Laser Damage Threshold | Bevel | Angle of Incidence (°) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV Enhanced Aluminum | 12.7 | 5.0 | BK7 | 250-400 | >85.0av | - | λ/10 | 20 - 10 | ≤ 3arcmin | ≥ 90% | +0, -0.2mm | ±0.1mm | 0.5J/cm2 @532 10ns pulse | 0.2mm x 45° typical | 45 |
| UV Enhanced Aluminum | 19.1 | 5.0 | BK7 | 250-400 | >85.0av | - | λ/10 | 20 - 10 | ≤ 3arcmin | ≥ 90% | +0, -0.2mm | ±0.1mm | 0.5J/cm2 @532 10ns pulse | 0.2mm x 45° typical | 45 |
| UV Enhanced Aluminum | 25.4 | 5.0 | BK7 | 250-400 | >85.0av | - | λ/10 | 20 - 10 | ≤ 3arcmin | ≥ 90% | +0, -0.2mm | ±0.1mm | 0.5J/cm2 @532 10ns pulse | 0.2mm x 45° typical | 45 |
| UV Enhanced Aluminum | 50.8 | 8.0 | BK7 | 250-400 | >85.0av | - | λ/10 | 20 - 10 | ≤ 3arcmin | ≥ 90% | +0, -0.2mm | ±0.1mm | 0.5J/cm2 @532 10ns pulse | 0.2mm x 45° typical | 45 |
| Enhanced Aluminum | 12.7 | 5.0 | BK7 | 400-700 | >94.0av | - | λ/10 | 20 - 10 | ≤ 3arcmin | ≥ 90% | +0, -0.2mm | ±0.1mm | 0.5J/cm2 @532 10ns pulse | 0.2mm x 45° typical | 45 |
| Enhanced Aluminum | 19.1 | 5.0 | BK7 | 400-700 | >94.0av | - | λ/10 | 20 - 10 | ≤ 3arcmin | ≥ 90% | +0, -0.2mm | ±0.1mm | 0.5J/cm2 @532 10ns pulse | 0.2mm x 45° typical | 45 |
| Enhanced Aluminum | 25.4 | 5.0 | BK7 | 400-700 | >94.0av | - | λ/10 | 20 - 10 | ≤ 3arcmin | ≥ 90% | +0, -0.2mm | ±0.1mm | 0.5J/cm2 @532 10ns pulse | 0.2mm x 45° typical | 45 |
| Enhanced Aluminum | 50.8 | 8.0 | BK7 | 400-700 | >94.0av | - | λ/10 | 20 - 10 | ≤ 3arcmin | ≥ 90% | +0, -0.2mm | ±0.1mm | 0.5J/cm2 @532 10ns pulse | 0.2mm x 45° typical | 45 |
| Enhanced Silver | 12.7 | 5.0 | BK7 | 400-700, 700-2000 | >96.0av, >97.5av | - | λ/10 | 20 - 10 | ≤ 3arcmin | ≥ 90% | +0, -0.2mm | ±0.1mm | 0.5J/cm2 @532 10ns pulse | 0.2mm x 45° typical | 45 |
| Enhanced Silver | 19.1 | 5.0 | BK7 | 400-700, 700-2000 | >96.0av, >97.5av | - | λ/10 | 20 - 10 | ≤ 3arcmin | ≥ 90% | +0, -0.2mm | ±0.1mm | 0.5J/cm2 @532 10ns pulse | 0.2mm x 45° typical | 45 |