Multi-Band Dichroic Mirrors/Beamsplitters


  • Dichroic Mirrors with Two Transmission Bands and Up to Two Reflection Bands
  • Ideal for Multiphoton and Fluorescence Microscopy
  • AR Coated, Rectangular Filters

DMBP740B

740 nm Shortpass and 940 nm Longpass Filter

Application Idea

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

DMSP740B

740 nm Shortpass and 1020 nm Longpass Filter

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Item # DMBP740B DMSP740B
Optical Specifications
Cutoff Wavelength(s) 740 nm 740 nm,
1080 nm
Cut-On Wavelength 940 nm 1020 nm
Transmission Bands 400 - 725 nm,
980 - 1700 nm
405 - 730 nm,
1040 - 1060 nm
Average Transmission
Over Specified Bands
>93% >94% (405 - 730 nm)
>90% (1040 - 1060 nm)
Reflection Band(s) 753 - 935 nm 760 - 1005 nm,
1096 - 1400 nm
Average Reflectance
Over Specified Band 
>97% >94%
AR Coating Range 400 - 1700 nm 405 - 1300 nm
General Specifications
Size 35.0 mm x 52.0 mm
Thickness 3.0 mm
Incident Angle 45°
Clear Aperture ≥85%, Elliptical
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 the link for detailed specifications on the substrate.
Dichroic Mirrors Selection Guide
Shortpass
Longpass
Multi-Band

Dichroic Mirror Diagram



Dichroic Mirror Engraving
Click to Enlarge

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

Features

  • Multi-Band Filters with Minimal Absorption Losses
  • Hard Coating Allows Easy Handling and Cleaning
  • Resistant to Damage from UV Light and Chemicals

Thorlabs' Dichroic Mirrors/Beamsplitters spectrally separate light by transmitting and reflecting light as a function of wavelength. Multi-band dichroic mirrors have three or more bands in which light is transmitted or reflected. Both filters on this page have two transmission bands and at least one reflection band, enabling them to function as longpass and shortpass dichroics. These multi-band dichroic mirrors/beamsplitters are ideal for multiphoton and fluorescence microscopy configurations.

The DMBP740B multi-band dichroic mirror has two transmission bands and one reflection band and may be used simultaneously as a 740 nm shortpass and 940 nm longpass filter. The DMSP740B multi-band dichroic mirror has two transmission and two reflection bands and may be used simultaneously as a 740 nm shortpass and 1020 nm longpass filter. These dichroics are highly transmissive below their cutoff regions and above their cut-on regions, while highly reflective between these regions. 

These optics are 35 mm x 52 mm and designed for use at a 45° angle of incidence. They feature a dichroic coating on one surface and an antireflection coating on the opposite surface. We recommend orienting the optics as illustrated in the dichroic mirror diagram above. These mirrors feature a caret on the side that points towards the AR-coated surface, as shown in the image above. 

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, these dichroics are useful in configurations with multiple beam paths for simultaneous 1P, 2P, and 3P imaging. These optics 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. These dichroic mirrors can also split spatially overlapping beams of different colors. The multiple transmission bands are ideal for high-speed fluorescence imaging and fluorophore applications. 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 these dichroics for DIY multiphoton or fluorescence microscopy.

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.

Posted Comments:
Jingfeng Chen  (posted 2023-08-22 10:14:05.507)
Dear Madam / Sir, Is it possible to make it a half inch round mirror? Do you have a dichroic mirror with the similar specifications @ ~15°? Thanks. Best, Jingfeng
jdelia  (posted 2023-08-24 01:40:03.0)
Thank you for contacting Thorlabs. I have reached out to you directly to discuss the feasibility of this customized part, and also to clarify your second inquiry.
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Multi-Band Dichroic Mirror: 740 nm Cutoff, 940 nm Cut-On

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
Cutoff Wavelength 740 nm
Cut-On Wavelength 940 nm
Transmission Bands (Tavg > 93%) 400 - 725 nm,
980 - 1700 nm
Reflection Band (Ravg > 97%) 753 - 935 nm
Item # More Info
DMBP740B info
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
DMBP740B Support Documentation
DMBP740BCustomer Inspired! 35 mm x 52 mm Multi-Band Dichroic Mirror, 740 nm Cutoff, 940 nm Cut-On
$1,089.42
Today
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Multi-Band Dichroic Mirror: 740/1080 nm Cutoff, 1020 nm Cut-On

DMSP740B 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
Cutoff Wavelengths 740 nm, 1080 nm
Cut-On Wavelength 1020 nm
First Transmission Band (Tavg > 94%) 405 - 730 nm
Second Transmission Band (Tavg > 90%) 1040 - 1060 nm
Reflection Bands (Ravg > 94%) 760 - 1005 nm, 1096 - 1400 nm
Item # More Info
DMSP740B info
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
DMSP740B Support Documentation
DMSP740B35 mm x 52 mm Multi-Band Dichroic Mirror, 740/1080 nm Cutoff, 1020 nm Cut-On
$1,243.79
Today