Dichroic Mirror

Dichroic Mirror


Dichroic mirrors are longpass and shortpass filters that are used at non-normal angles of incidence. They highly reflect one specified spectral region while optimally transmitting another. Dichroics are available at all wavelengths, with reflectivity typically reaching values greater than 98% and transmission typically exceeding 85%. Dichroics are non-absorbing so that all light that is not transmitted is specularly reflected.

Capability

Common Specification
Material N-BK7, Fused Silica
Dimension tolerance ± 0.10 mm
Diameter tolerance +0/-0.1mm
Thickness tolerance ± 0.10 mm
Clear Aperture >85%
Parallelism <1 arc minute
Flatness Lambda/10 per 1 inch (Substrate)
Surface quality  S/D 10-5 or S/D 20-10 (Substrate)
Bevel 0.2mmx45°
Coating Surface 1: HR @wavelength-1 + HT @wavelength-2
Surface 2: AR @wavelength-2
Angle of Incident: 0deg or 45 deg

Part Number Material Diameter (mm) Thickness (mm) Coating Type
DDM-BK7-D12.7-3.0T-HR1064+HT532 BK7 12.7 3.0 R>99.8% @ 1064nm & R<5% @ 532nm AOI=0Deg
DDM-BK7-D12.7-3.0T-HR532+HT1064 BK7 12.7 3.0 R>99.8% @ 532nm & R<5% @ 1064nm AOI=0Deg