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Ultra-broadband Metallic Mirrors

Ultra-broadband Metallic Mirrors

  • High reflectance over a broad spectral range
  • Enhanced reflectance in the visible range
  • Effective over wide angles of incidence
  • 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)MaterialWavelength Range (nm)Reflectance (%)Angle of Incidence ( )FlatnessSurface QualityParallelism toleranceClear ApertureDiameter toleranceThickness toleranceLaser Damage ThresholdBevelAngle of Incidence (°)
UV Enhanced Aluminum12.75.0BK7250-400>85.0av-λ/1020 - 10≤ 3arcmin≥ 90%+0, -0.2mm±0.1mm0.5J/cm2 @532 10ns pulse0.2mm x 45° typical45
UV Enhanced Aluminum19.15.0BK7250-400>85.0av-λ/1020 - 10≤ 3arcmin≥ 90%+0, -0.2mm±0.1mm0.5J/cm2 @532 10ns pulse0.2mm x 45° typical45
UV Enhanced Aluminum25.45.0BK7250-400>85.0av-λ/1020 - 10≤ 3arcmin≥ 90%+0, -0.2mm±0.1mm0.5J/cm2 @532 10ns pulse0.2mm x 45° typical45
UV Enhanced Aluminum50.88.0BK7250-400>85.0av-λ/1020 - 10≤ 3arcmin≥ 90%+0, -0.2mm±0.1mm0.5J/cm2 @532 10ns pulse0.2mm x 45° typical45
Enhanced Aluminum12.75.0BK7400-700>94.0av-λ/1020 - 10≤ 3arcmin≥ 90%+0, -0.2mm±0.1mm0.5J/cm2 @532 10ns pulse0.2mm x 45° typical45
Enhanced Aluminum19.15.0BK7400-700>94.0av-λ/1020 - 10≤ 3arcmin≥ 90%+0, -0.2mm±0.1mm0.5J/cm2 @532 10ns pulse0.2mm x 45° typical45
Enhanced Aluminum25.45.0BK7400-700>94.0av-λ/1020 - 10≤ 3arcmin≥ 90%+0, -0.2mm±0.1mm0.5J/cm2 @532 10ns pulse0.2mm x 45° typical45
Enhanced Aluminum50.88.0BK7400-700>94.0av-λ/1020 - 10≤ 3arcmin≥ 90%+0, -0.2mm±0.1mm0.5J/cm2 @532 10ns pulse0.2mm x 45° typical45
Enhanced Silver12.75.0BK7400-700, 700-2000>96.0av, >97.5av-λ/1020 - 10≤ 3arcmin≥ 90%+0, -0.2mm±0.1mm0.5J/cm2 @532 10ns pulse0.2mm x 45° typical45
Enhanced Silver19.15.0BK7400-700, 700-2000>96.0av, >97.5av-λ/1020 - 10≤ 3arcmin≥ 90%+0, -0.2mm±0.1mm0.5J/cm2 @532 10ns pulse0.2mm x 45° typical45

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