Dichroic Beamsplitters

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Dichroic Beamsplitters

Used at non-normal angles of incidence, these longpass and shortpass filters highly reflect one specified spectral region while optimally transmitting another.

Dichroic (DC) 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).

Spectral trace measurements of DC, DR and DM dichroic beamsplitters used at 45° angle of incidence.