Beamsplitters

Special Properties and Features

• Neutral division of visible light, images, and laser beams
• Anti-reflective backside
• Metal-free purely dielectric layers
• Free of double image or phantom laser beam generation
• Low absorption and energy loss
• Designed for random polarization
• Large dimensions are available (DST500)
• Designed for an angle of incidence of 45°

Typical Applications

• Reference measurement systems
• Laser beamsplitter for medium power
• 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

• SIR-Series
  (infrared-reflecting hot mirror, IR-filters)
• SHD-Series
  (dichroic infrared-transmitting cold mirror)
• ND filters
  (attenuation filters made of SCHOTT NG materials)
• TDS Spy-Mirrors
  (partially transparent mirror)

Get a Quote

 

Beamsplitters are used in various applications in a range of industries. They are crucial to the development of optical systems for reference measurements, laser processing, medical imaging, machine vision and spectroscopy. Whether in a laboratory setting or in industry, beamsplitter plates are essential optical components that enable many technical applications.

Our 45° plate beamsplitter features a high-quality dielectric coating that we developed for optimal low-loss splitting performance. It divides light rays neutrally into two paths. Like an optical mirror, it reflects a portion of the incoming light at 45°, while transmitting the remaining light energy at 0°, similar to an optical window. This effect is achieved through optical interference.

The design of the DST includes a multilayer thin film on the input side that determines the reflection-transmission ratio. In addition, the back side of the beamsplitter plates is coated with an anti-reflective coating to minimize unwanted reflections and thus enable improved image sharpness and integrity in optical systems.
DST plate beam splitters are color neutral and linearly split visible light. Due to the low absorption thanks to their dielectric construction, they can also split laser beams up to medium power. The design offers durability and high abrasion resistance. These properties make our beam splitter plates suitable for various setups that require reliable and efficient light management.

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

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 customized 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 search for 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.

 

Get a Quote

 

48-hour express manufacturing

 

Specifications

DST300 beamsplitter

Enlarged view of the DST300 curve

DST500 beamsplitter

Enlarged view of the DST500 curve

DST700 beamsplitter

Enlarged view of the DST700 curve

Standard Thicknesses

Please select a thickness to get a quote:

Thickness (mm)	Tolerance
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.
All DST beam splitters have an AR coating on the back.
The materials marked with "✔" are available within our 48-hour express manufacturing.

Splitting 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

• Selected float glass
• Other substrate materials per inquiry

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: March 18, 2025