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Ultra-broadband Metallic Mirrors |
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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  /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.
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| Specifications & Tolerances |
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| Surface flatness: /10 |
Diameter: +0, -0.2mm |
| Surface quality: 20-10 |
Parallelism: < 0.3arcmin |
| Thickness: +0.1mm |
Clear aperture: >90% diameter |
| Bevel: 0.2mm x 45° typical |
Material: BK7, grade A |
| Laser damage threshold: 0.5J/cm2 for 10ns pulse |
| Durability: to MIL-C-675 |
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| Ultra-Broadband Metallic Mirrors |
Part Number |
Type |
Reflectance
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Wavelength Range |
Diameter, D |
Thickness, T |
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% |
(mm)
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(mm) |
(Inches) |
(mm) |
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UV
Enhanced Aluminum |
>85.0av |
250-400 |
0.5 |
12.7 |
5 |
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UV
Enhanced Aluminum |
>85.0av |
250-400 |
0.75 |
19.1 |
5 |
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UV
Enhanced Aluminum |
>85.0av |
250-400 |
1 |
25.4 |
5 |
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UV
Enhanced Aluminum |
>85.0av |
250-400 |
2 |
50.8 |
8 |
033-4440 |
Enhanced Aluminum |
>94.0av |
400-700 |
0.5 |
12.7 |
5 |
033-4450 |
Enhanced Aluminum |
>94.0av |
400-700 |
0.75 |
19.1 |
5 |
033-4460
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Enhanced Aluminum |
>94.0av |
400-700 |
1 |
25.4 |
5 |
033-4470
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Enhanced Aluminum |
>94.0av |
400-700 |
2 |
50.8 |
8 |
033-4540
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Enhanced Silver |
>96.0av |
400-700 |
0.5 |
12.7 |
5 |
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5 |
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5 |
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033-4570 |
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400-700 |
2 |
50.8 |
8 |
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>97.5av |
700-2000 |
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033-4640 |
Protected Gold |
>96.0av |
650-IR |
0.5 |
12.7 |
5 |
033-4650 |
Protected Gold |
>96.0av |
650-IR |
0.75 |
19.1 |
5 |
033-4660 |
Protected Gold |
>96.0av |
650-IR |
1 |
7.7 |
5 |
033-4670 |
Protected Gold |
>96.0av |
650-IR |
2 |
25.4 |
8 |
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