Used at non-normal angles
of incidence, these longpass and shortpass filters highly reflect one
specified spectral region while optimally transmitting another.
filters provide wide regions of both transmission and reflection.
They exhibit a high degree of polarisation along with a somewhat
shallow transition slope.
Dichroic mirror (DM)
filters feature a steep transition slope, minimum polarization, a
wide region of reflection, and a limited region of transmission.
Dichroic reflector (DR)
filters provide a steep transition slope, low polarization, a wide
region of transmission, and a limited region of reflection. (Figure 5).
measurements of DC, DR and DM dichroic beamsplitters used at 45°
angle of incidence.