Home / Products / Thin Film Coatings / Beam splitter Plates

Optical Beamsplitters

DST Series

Special Properties and Features

  • Neutral splitting of light, images, and laser beams
  • Anti-reflection coating on the backside
  • Free of double images and phantom laser beam effects
  • Metal-free, all-dielectric coating construction
  • Low light-loss
  • Broadband beamsplitter design for random polarization
  • High precision
  • Large dimensions are available (DST500)

Typical Applications

  • Reference measurement systems
  • Laser beamsplitters in optical benches
  • Semi-transparent optics for interferometer systems
  • Splitting or merging of optical beam paths
  • Sensor technology
  • Fiber-optic applications
  • Telecommunication applications
  • 3D imaging and machine vision
  • Photonics research
  • Beamsplitter plates in optical instruments
  • Laser beam combiners
  • Optical measurement technology
  • Robotics
  • Broadband divider mirrors for imaging applications

Related optics

Request for Quotation

Optics manufacturing within 48h 48-hour express service


Optical beamsplitters are essential components in a vast array of optical systems and applications. These plates, also known as beam splitter mirrors, are designed to divide an incident light beam into two or more beams, allowing them to follow different paths. With their excellent optical properties, our beamsplitter plates find typical use in numerous industries, including telecommunications, spectroscopy, microscopy, imaging systems, laser technology, and scientific research.

The primary function of a beamsplitter plate is to split light into two separate beams with specific intensity ratios. So, our DST beamsplitters reflect a certain proportion of the incoming light like an optical mirror with an angle of incidence of 45°. The remaining light is transmitted in the 0° direction. This partial reflection and transmission are achieved through the principle of interference.

The multilayer dielectric thin film coating applied to the DST beamsplitter's input side determines the reflection-to-transmission ratio. Plate beamsplitters used to split a laser beamA broadband anti-reflection coating on the back of the beamsplitters prevents secondary reflection. So-called "ghost images" or phantom laser beams do not occur. In addition, the AR coating reduces the light loss usually caused by the reflective backside of a beam splitter to a minimum. Unlike dichroic beamsplitters, such as our SIR filters or SHD mirrors, the DST splitter works neutrally. Instead of separating different spectra, it splits visible light beams or images in a color-neutral way.

In contrast to beamsplitters with metallic coatings, which typically absorb a large portion of the incidence light, the energy losses of the DST beamsplitters are minimal because their dielectric layer system nearly absorbs no light in the nominal wavelength range. So, the DST beamsplitters can also split laser beams with up to medium laser power. Many customers use them in reference measurement systems and optical benches. The non-metallic construction of our DST beam splitter plates ensures excellent durability and high abrasion resistance.

We designed our 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 polarization accuracy. However, this does not exclude applications with polarized light sources. You can often achieve the desired division by selecting a higher or lower splitting ratio that already exists. In such cases, the cost is drastically reduced compared to a dedicated batch of customized beamsplitters, especially if only smaller quantities are needed.

If you need beam-splitting optics for polarized light, specific lasers, or a particular laser line, and when the polarization state is critical, please contact us and provide information on your application's wavelength, required splitting ratio, and other relevant details. We can coat optics with different division ratios according to individual specifications in addition to our standard beamsplitters from the DST300, DST500, and DST700 series. Please use our inquiry form for assistance, further information, or help with customized beamsplitter optics.


How can you 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 optics. We often deliver our beamsplitters 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 quotation 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 get a quote for our broadband optical plate beamsplitters with the dimensions you need.


Request for Quotation


Customized optics manufacturing within 48h 48-hour express service



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

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

DST700 beamsplitters
DST700, typical spectral transmittance
Enlarge the 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 inquiry.
The thicknesses marked with "" are available within 48–hour express service.


  • Up to max. 630 mm × 810 mm

Splitting ratios for a 45° angle of incidence

(All specifications are 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 430–685 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
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 the laser 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 are searching for a cube beamsplitter, beamsplitter-prism, non-polarizing beam splitter cube, a cube beam splitter for other wavelength areas, or beamsplitter penta-prisms, please send us a detailed inquiry with all specifications and requirements. Such kinds of optics are always customized and require larger batch quantities.


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

© 1994 – 2023 Präzisions Glas & Optik GmbH

Last update: 05.09.2023