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Dichroic Mirrors / BeamsplittersThorlabs' Dichroic Mirrors/Beamsplitters spectrally separate light by transmitting and reflecting light as a function of wavelength. A longpass dichroic mirror is highly reflective below the cut-on wavelength and highly transmissive above it, while a shortpass dichroic mirror is highly transmissive below the cutoff wavelength and highly reflective above it. We also offer a dual-band dichroic mirror, which has two transmission bands and one reflection band. This type of dichroic is highly transmissive below the cutoff wavelength and above the cut-on wavelength, while highly reflective between the cutoff and cut-on.