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Beamsplitter plates for a 45° angle of incidence

DST Series

Special Properties and Features

  • Neutral division of visible light sources, images, and laser beams
  • Broadband AR coating on the backside
  • No double image or phantom laser beam generation
  • Dielectric coating
  • Low energy loss
  • Designed for random polarization
  • Large dimensions are available (DST500)

Typical Applications

  • Reference measurement systems
  • Laser beamsplitters in optical benches
  • Splitting or merging of optical beam paths
  • Sensor technology
  • Machine vision
  • Fiber optic applications
  • 3D scanners
  • Photonics research
  • Beam splitter plates for optical instruments
  • Laser beam combiners
  • Linear optical measurement technology
  • Robotics and automation
  • Broadband divider mirrors for imaging applications

Related Products



Beamsplitter Applications in Different Industries

Beamsplitters find diverse applications across industries, from healthcare to telecommunications. They are pivotal in creating optical systems for laser processing, medical imaging, and spectroscopy. In telecommunications, beamsplitters facilitate signal transmission by separating wavelengths efficiently. Furthermore, in manufacturing, beamsplitters aid in quality control processes by enabling precise measurements using light interference techniques. This versatility showcases the relevance and significance of beamsplitters in advancing various industrial operations.


DST Beamsplitters for Your Optical Task

DST beamsplitters split light beams into two paths in a wide range of optical systems. Like optical mirrors, DST beam splitters reflect part of the incident light at a 45° angle while the remaining light energy is transmitted at 0°, similar to an optical window. This effect is achieved through optical interference.


How are the Beamsplitters constructed?

The construction of the beamsplitters involves a multi-layer dielectric thin film coating on the input side, which Plate beam splitter splitting a laser beamdetermines reflection and transmission values. Additionally, a broadband anti-reflection coating that is coated on the backside eliminates secondary reflections, prevents ghosting and phantom laser beams, and minimizes losses. Our DST beamsplitters are color-neutral, split visible light linearly, and have minimal light absorption. Due to their purely dielectric layers, they can split up to medium-power laser beams. The coating design offers durability and high abrasion resistance.


What Light Sources is the DST made for?

DST beamsplitters are designed for use with unpolarized light sources. When using polarized light sources such as lasers, the R/T values may differ from the specifications in the datasheet. However, alternative division ratios can be chosen in certain situations to achieve the desired outcome without needing a customized production run. Therefore, using our standard DST beamsplitters can often lead to cost savings, particularly when only small quantities are required.


Customized Beamsplitter Designs

If you need beamsplitters for polarized light, specific lasers, or a particular laser line, don't hesitate to contact us with information on the wavelength of your application, the required R/T, and all other relevant details. In addition to our standard DST300, DST500, and DST700 series, we can coat beamsplitters with division ratios to individual specifications. Please use our inquiry form to request assistance or more information, or to help design your custom-coated beam splitter.


How do I order the DST Plate Beamsplitters?

Here at our company, we specialize in manufacturing and delivering custom-sized optics at a rapid pace. We often fabricate and ship our beamsplitters faster than distributors can ship their catalog items from stock. This quick delivery is usually possible for larger quantities as well! Typically, you will receive our offer within a few minutes of your request, provided you are in our time zone, and no questions need to be clarified.

Please select a beamsplitter from the table on this page, or use the RFQ button below to create your inquiry.




Customized optics within 48h 48-hour express manufacturing



DST300 beamsplitter
DST300, spectral transmittance curve
Enlarge the DST300 curve

DST500 beamsplitter
DST500, typical transmittance
Enlarge the DST500 curve

DST700 beamsplitter
DST700, typical spectral transmittance
Enlarge the DST700 curve

Standard Thicknesses

Please click on a thickness to receive a quote:

Thickness (mm)


48h-Express manufacturing
R : T = 70 : 30
1.00 ±0.10
R : T = 50 : 50
1.00 ±0.10
R : T = 50 : 50
3.30 ±0.20 -
R : T = 30 : 70
1.00 ±0.10
Other thicknesses per inquiry.
All DST beamsplitters have an AR-coated backside.
The materials marked with "" are available within our 48-hour express manufacturing.


  • Up to max. 630 mm × 810 mm

Division ratios at 45° angle of incidence

(All data refer to unpolarized light.)

  • R/T = 70/30 (± 10%) for 450–650 nm
  • R/T = 50/50 (± 6%) for 450–650 nm,
    R/T = 50/50 (± 10%) for 430–685 nm
  • R/T = 50/50 (± 10%) for 450–650 nm
  • R/T = 30/70 (± 8%) for 450–650 nm,
    R/T = 30/70 (± 10%) for 400–700 nm

Other ratios, angles of incidence, and wavelengths are possible on request.


Substrate Materials


  • Depending on the material and shape

Surface Quality

  • Better than 80-50 scratch & dig (MIL-0-13830A)
  • Other qualities per inquiry

Other Specifications

  • Adherence according to MIL-C-675 C (tape test)
  • Abrasion resistance according to MIL-M-13508 C

Note: If you are searching for cube beamsplitters, non-polarizing cube beamsplitters, beam splitter prisms, beam splitter cubes for particular wavelength ranges, or beam splitter penta-prisms, please send us a detailed inquiry with all your specifications and requirements. Such optics are always customized and require larger production quantities.


All details and specifications given are mean reference values and are not guaranteed. Please also consider our "Notes on technical specifications".

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Last update: July 16, 2024