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45° Beamsplitters

Beamsplitter Plates

DST Series

Special Properties and Features

  • Neutral division of visible light, images, and laser beams
  • Broadband AR coating on the backside
  • Free of double image or phantom laser beam generation
  • Metal-free purely dielectric layers
  • Low energy loss
  • Designed for random polarization
  • Large dimensions are available (DST500)

Typical Applications

  • Reference measurement systems
  • Laser beamsplitter in optical benches
  • Splitting or merging of optical beam paths
  • Sensor technology
  • Machine vision systems
  • Laser intensity control
  • Fiber optics
  • 3D scanners
  • Photonics research
  • Plate beam splitters for optical instruments
  • Laser beam combiners
  • Linear optical measurement technology
  • Robotics and automation
  • Broadband divider mirrors for imaging applications
  • Large-format beamsplitter optics

Related Products

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Indispensable optical components for a wide range of applications

Beamsplitters find diverse use cases across industries. They are pivotal in creating optical systems for reference measuring, laser processing, medical imaging, machine vision, and spectroscopy. Whether in laboratory facilities or in industry, beamsplitter plates are essential optical components that make many technical applications possible.

 

DST beamsplitter plates for your optical task

Our flat 45°-plate beamsplitter features a high-quality dielectric coating, which we designed to provide optimal splitting performance. It neutrally splits light beams into two paths. Like an optical mirrors, it reflects 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 is the DST beamsplitter constructed?

The construction of the DST involves a multi-layer dielectric thin film coating on the input side, which Plate beam splitter splitting a laser beamdetermines the reflection-to-transmission ratio. Additionally, the backside of the beamsplitter plates is anti-reflection coated to minimize unwanted reflections, allowing for enhanced image clarity and integrity in optical systems.
DST plate beamsplitters are color-neutral, split visible light linearly, and have minimal absorption. Due to their purely dielectric layers, they can split up to medium-power laser beams. The design offers durability and high abrasion resistance. These features make our beam splitter plates suitable for various setups requiring reliable and efficient light management.

 

What light sources is the DST series made for?

DST beamsplitters are designed for use with non-polarized light sources at an angle of incidence of 45°. When using polarized light sources, such as lasers, or when using the DST at other angles of incidence, the R/T values may deviate from the specifications in the datasheet. However, alternative beam splitting ratios can often be selected to achieve the desired result without the need for a customized coating batch. Therefore, the use of our standard DST can also save costs in these cases, especially if only small quantities are required.

 

Customized beamsplitter designs

If you require beamsplitters for polarized light, specific lasers, or a particular laser wavelength, don't hesitate to contact us with information on the wavelength of your application, the required R/T ratio, and all other relevant details. In addition to our standard DST300, DST500, and DST700 series, we offer customized evaporation of 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 beamsplitters?

Ordering our beamsplitter plates is straightforward. Please select a coating from our table, where you will find various thickness options. Each thickness includes a link that opens an inquiry form for your convenience. If you have specific requirements or need additional information, you can also utilize the general request buttons available throughout our web pages. Our team is ready to assist you with your order and answer any questions you may have.

We specialize in manufacturing and delivering custom-sized optics rapidly. We often fabricate and ship our optical components 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.

 

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Customized optics within 48h 48-hour express manufacturing

 

Specifications

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 select a thickness to get a quote:

Thickness (mm)

Tolerance

48h-Express manufacturing
DST300
R : T = 70 : 30
1.00 ±0.10
DST500
R : T = 50 : 50
1.00 ±0.10
DST500T
R : T = 50 : 50
3.30 ±0.20 -
DST700
R : T = 30 : 70
1.00 ±0.10
Other thicknesses per inquiry.
The DST series have an AR-coated backside.
The materials marked with "" are available within our 48-hour express manufacturing.

Division ratios at 45° angle of incidence

(All ratio data refer to unpolarized light.)

DST300
  • R/T = 70/30 (± 10%) for 450–650 nm
DST500
  • R/T = 50/50 (± 6%) for 450–650 nm,
    R/T = 50/50 (± 10%) for 430–685 nm
DST500T
  • R/T = 50/50 (± 10%) for 450–650 nm
DST700
  • 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.

 

Dimensions

  • Up to a size of 630 mm × 810 mm

Substrate Materials

Flatness

  • Depending on the substrate 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 beamsplitters, beam splitter prisms, 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: January 17, 2025