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Dual-Band Dichroic Mirror/Beamsplitter
35 mm x 52 mm
The DMBP740B Dual-Band Dichroic Mirror Mounted in the OPX2400 Cerna® Breadboard Top with Two-Position Slider
Dichroic Mirror Diagram
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Click Here for Raw Data from 250 - 2500 nm
The blue shaded regions denote the transmission and reflection bands for which the performance is guaranteed to meet the stated specifications. Performance outside the shaded regions will vary from lot to lot and is not guaranteed.
Thorlabs' Dichroic Mirrors/Beamsplitters spectrally separate light by transmitting and reflecting light as a function of wavelength. Dual-band dichroic mirrors have two transmission bands and one reflection band that are separated by a cutoff and cut-on wavelength. 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.
Our dual-band dichroic mirror has a 740 nm cutoff wavelength and a 940 nm cut-on wavelength. It is 35 mm x 52 mm and designed for use at a 45° angle of incidence. The transmission and reflection plot for this dichroic with unpolarized light is shown to the right. Please see the Graphs tab for more transmission and reflection plots.
This optics features a dichroic coating on one surface and an antireflection coating on the opposing surface. We recommend orienting the optic as illustrated in the diagram above. This mirror features a caret on the side that points towards the AR-coated surface, as shown in the image to the lower left.
For thermally sensitive applications, Thorlabs offers hot and cold mirrors. We also offer longpass dichroic mirrors, which are highly reflective below the cutoff wavelength and highly transmissive above it, as well as shortpass dichroic mirrors, which are highly reflective above the cutoff wavelength and highly transmissive below it.
Surface Quality and Durability
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A Caret Points to AR-Coated Side
In the graphs below, the shaded regions denote the transmission and reflection bands of the dichroic mirror/beamsplitter for which the performance is guaranteed to meet the stated specifications. Performance outside the shaded regions will vary from lot to lot and is not guaranteed.
Typical Applications for Dichroic Mirrors/Beamsplitters
Ray Diagram Illustration
In both cases, the combined, polychromatic beam is on the dichroic coated side of the dichroic filter. To better direct the reflection, we recommend orienting them such that the wavelength being reflected does not pass through the substrate. Dichroic mirrors/beamsplitters differ from typical beamsplitters in that the beams can be combined or separated without a significant loss of intensity.
Figure 1. This figure depicts a dichroic mirror being used to combine two beams of different colors.
Figure 2. This figure depicts a dichroic mirror being used to split two beams of different colors.