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Optical Beamsplitters

DST Series

Special Properties & Features

  • Neutral splitting of light, images, and laser beams
  • Anti-reflection coated backside
  • Free of double images and phantom laser beam effects
  • Metal-free dielectric optical coating
  • Low light-loss
  • Broadband design for random polarization
  • High optical precision
  • Large dimensions possible (DST500)

Typical Applications

  • Optical reference measurement systems
  • Laser beamsplitters in optical benches
  • Semi-transparent mirrors for interferometer systems
  • Splitting or merging of optical beam paths
  • Sensor technology
  • Fiber optical applications
  • Image processing and machine vision
  • Photonics research
  • Beamsplitter plates in optical instruments
  • Laser beam combiners
  • Optical measurement technology
  • Divider mirrors for imaging applications

Related optics

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Optics manufacturing within 48h Available in 48 h Express-Service

Optical beamsplitters divide incident light or laser beams into two optical paths. They reflect a certain proportion of the incident light like an optical mirror with an angle of incidence of 45°. At the same time, they allow the remaining light to pass through in the 0° direction. The multilayer dielectric thin film coating applied to the input side of the beamsplitters determines the optical R:T beam-splitting ratio. Plate beamsplitters used to split a laser beamA broadband anti-reflection coating on the back of the beamsplitter prevents unwanted secondary reflections. So-called "ghost images" or phantom laser beams do not occur.

Unlike dichroic beamsplitters, such as our SIR filters or SHD mirrors, the DST-splitter works neutrally. Instead of separating different optical spectra, it splits visible light beams or images color neutral. Furthermore, light loss caused by unwanted reflections from the backside of the optics reduces to a minimum.

A non-metallic construction of our DST-beamsplitter plates ensures excellent durability and high abrasion resistance. Their dielectric layer system nearly absorbs no light in the nominal wavelength range. In contrast to metallic beamsplitters that usually lose a large portion of the incidence light by absorption, energy losses are minimal. The DST-beamsplitters can also work as a splitter for laser beams with up to medium laser power. Many customers use them in reference measurement systems and optical benches.

We designed all our optical DST-beamsplitters for light with random polarization. When using a polarized light source or a laser, the real-world splitter's ratio may deviate from the specifications in this datasheet, as we don't define them in terms of polarizing effects. However, this does not generally exclude optical applications with polarized light sources. You can often achieve the desired division by selecting a higher or lower existing splitting ratio. The cost is drastically reduced compared to a batch of custom-coated beamsplitters in such cases.

If you need beam-splitting optics for polarized light or laser applications, don't hesitate to contact us and provide information on your application's wavelength, required splitting ratio, and other relevant details. We can coat optics with custom ratios according to individual specifications in addition to our standard beamsplitters from the DST300, DST500, and DST700 series. Please use our inquiry form to contact us for assistance, further information, or help with your customized beamsplitter optics.


How can I order the DST-plate beamsplitters?

We are not limited to standard optics with fixed dimensions. Our company specializes in fast manufacturing and delivery of our custom-sized optical beamsplitters. We often deliver custom beam splitters as fast or even faster than is usual for stock items in the market. Moreover, this also applies to large production quantities! You will usually receive our quote within a few minutes, provided you are in our time zone and we have no queries.

Please choose a thickness from the table or click the button below to request a quote for our broadband optical plate beamsplitters with custom dimensions.


Request for Quotation


Customized optics manufacturing within 48h Available in 48 h Express-Service



DST300 beamsplitters
DST300, spectral transmittance curve
Enlarge transmission curve of the DST300

DST500 beamsplitters
DST500, typical transmittance
Enlarge transmission curve of the DST500

DST700 beamsplitters
DST700, typical spectral transmittance
Enlarge transmission curve of the DST700

Standard Thicknesses

(Please click on a thickness to get a quote)

Thickness (mm)


48h-Express Service
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 request.
The thicknesses marked with "" are available within 48–h Express Service.


  • Up to max. 630 mm × 810 mm

Splitting ratios for 45° angle of incidence

(All specifications for random polarization)

  • R/T = 70/30 (± 10 %) for 450–650 nm
  • R/T = 50/50 (± 6 %) for 450–650 nm,
    R/T = 50/50 (± 10 %) for 430–85 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
Different beam splitting ratios, angles of incidence, and wavelength ranges are possible on demand.

Coating Construction

Substrate Materials


  • Depending on the material, thickness, and shape

Damage Threshold

  • Depending on the laser beam diameter and laser power
    (Please send an inquiry if power is relevant)

Surface Quality

  • Better than 80-50 scratch & dig (MIL-0-13830A)
  • Different surface 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 search for cube-beamsplitters, beamsplitter-prisms, non-polarizing beam splitter cubes, or cube beamsplitters for other wavelength areas, please send us a detailed request with all specifications and requirements. Such kinds of optical components are always custom-made and require minimum batch quantities.


All given details and specifications are mean reference values and are not guaranteed. Also, please consider our "Notes on technical specifications".

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Last update 21.03.2022