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Dual-Band Dichroic Mirror/Beamsplitter


  • Two Transmission Bands and One Reflection Band
  • 740 nm Cutoff Wavelength and 940 nm Cut-On Wavelength
  • AR Coating Range: 400 - 1700 nm 

DMBP740B

35 mm x 52 mm

Application Idea

The DMBP740B Dual-Band Dichroic Mirror Mounted in the OPX2400 Cerna® Breadboard Top with Two-Position Slider

Dichroic Mirror Diagram

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DMBP740B Transmission and Reflectance
Click to Enlarge

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.
Specifications
Optical Specifications
Cutoff Wavelength 740 nm
Cut-On Wavelength 940 nm
Clear Aperture ≥85%, Elliptical
Transmission Bands 400 - 725 nm,
980 - 1700 nm
Average Transmission
Over Specified Bands
>93%
Reflection Band 753 - 935 nm
Average Reflectance
Over Specified Band 
>97%
General Specifications
Size 35.0 mm x 52.0 mm
Thickness 3.0 mm
Incident Angle 45°
Surface Quality 40-20 Scratch-Dig
Transmitted Wavefront Error ≤λ/4 @ 632.8 nm Over Clear Aperture
Reflected Wavefront Error ≤λ/4 @ 632.8 nm Over Clear Aperture
Substrate Material UV Fused Silicaa
  • Click Link for Detailed Specifications on the Substrate

Features

  • Dual-Band Filter Functions as a Longpass or Shortpass Filter with Minimal Absorption Losses
  • Hard Coating Allows Easy Handling and Cleaning
  • Resistant to Damage from UV Light and Chemicals
  • Ideal for Multiphoton Microscopy

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.

Applications
In multiphoton microscopy, this type of dichroic is useful in configurations with multiple beam paths for simultaneous 1P, 2P, and 3P imaging. This optic can combine three excitation beams with different wavelengths. For example, in one path, two beams that have a wavelength within the transmission bands can transmit through the dichroic and combine with another beam in a second path that reflects off of the dichroic. This dichroic mirror can also split spatially overlapping beams of different colors. See the Applications tab for more details.

Surface Quality and Durability
Thorlabs' Dichroic Mirrors/Beamsplitters consist of a hard, ion-beam-sputtered coating deposited on a UV fused silica substrate, providing excellent transparency over the operating wavelength range, virtually zero autofluorescence, and a low coefficient of thermal expansion, making them an ideal choice for applications from the UV to the near IR. The hard coatings themselves have a 40-20 scratch-dig surface quality and allow the optics to be cleaned and handled like typical glass. As opposed to soft coatings, they have improved resistance to humidity effects and can withstand high optical irradiation intensities with no noticeable degradation or burns, even under prolonged exposure to ultraviolet light.

Mounting Options
The Cerna® Breadboard Top with Two-Position Slider can be used to mount the dichroic for DIY microscopy. 

Dichroic Mirror Engraving
Click to Enlarge

A Caret Points to AR-Coated Side
Optic Cleaning Tutorial
Optical Coatings Guide

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.

DMLP740B Transmission and Reflectance Unpolarized Light Click to Enlarge
Click Here for Raw Data from 250 - 2500 nm
DMBP740B Transmission and Reflectance P-Polarized Light Click to Enlarge
Click Here for Raw Data from 250 - 2500 nm
DMBP740B Transmission and Reflectance S-Polarized Light Click to Enlarge
Click Here for Raw Data from 250 - 2500 nm

Typical Applications for Dichroic Mirrors/Beamsplitters

  • Fluorescence Microscopy
  • Splitting or Combining Two Beams of Different Wavelengths
  • Filtering of Spectral Components

Ray Diagram Illustration
Figure 1 depicts a dichroic mirror/beamsplitter being used to combine a transmitted beam (blue) with a reflected beam (red). The transmitted beam has a wavelength in the transmission band of the optic, and the reflected beam has a wavelength in the reflection band of the optic. If the direction of propagation is reversed, the optic becomes a beamsplitter, as shown in Figure 2.

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.

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DMBP740B Support Documentation
DMBP740BNEW!35 mm x 52 mm Dual-Band Dichroic Mirror, 740 nm Cutoff, 940 nm Cut-On
$917.00
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