On round optics, an engraved arrow points toward the surface with the AR coating on the 25 mm x 36 mm rectangular optics, the side with the engraving has the dichroic coating. We recommend orienting the optic as illustrated in the diagram to the upper right. These optics feature a dichroic coating on one surface and an antireflection coating on the opposing surface. These mirrors are designed for use at a 45° angle of incidence and are available in five sizes: Ø1/2", Ø1", Ø2", 25 mm x 36 mm, and 35 mm x 52 mm. Please see below for transmission and reflection plots of each mirror. Our longpass dichroic mirrors are offered in several different cut-on wavelengths ranging from 425 to 1800 nm, which are listed in the selection guide graphic to the right. It is highly transmissive below the cutoff wavelength and above the cut-on wavelength, while highly reflective between the cutoff and cut-on. This dichroic has two transmission bands and one reflection band that are separated by a cutoff and cut-on wavelength. We also offer a multi-band dichroic mirror that can be used as a longpass mirror. This type of dichroic is highly reflective below the cut-on wavelength and highly transmissive above it. Longpass dichroic mirrors have a transmission and reflection band that are divided by a cut-on wavelength. Thorlabs' Dichroic Mirrors/Beamsplitters spectrally separate light by transmitting and reflecting light as a function of wavelength. Resistant to Damage from UV Light and Chemicals.Hard Coating Allows Easy Handling and Cleaning.Multi-Band Dichroic Filter with Two Transmission Bands and One Reflection Band.Dichroic Filters Function as Longpass Filters with Minimal Absorption Losses.
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