Custom Plate Beam Splitter Fabrication

Sydor Optics fabricates several kinds of dielectric and metal coated plate beam splitters with various reflection/transmission (R:T) ratios, which offer many advantages when compared to cube beam splitters. For example, plate beam splitters can perform at higher temperatures, withstand higher levels of laser power and typically cost less than when in cube form. Plate beam splitters are also much lighter and smaller for applications that require minimal weight or have limited space available.

So whether you need custom heads up displays (HUDs), or you’re testing laser or illumination systems, developing fluorescence applications, or are involved in spectroscopy, custom plate beam splitters can be manufactured to best suit your specific needs. Sydor Optics offers various types of plate beam splitters for ultraviolet (UV), visible (VIS) and infrared (IR) applications.

Available Materials

Based upon customer demand, Sydor Optics offers plate beam splitters made from the following substrate materials. Of course, if you don’t see a material you need, please contact a Sales Engineer, who will gladly discuss additional options that may be available.

Fused Silica Beam Splitters

Fused Quartz Beam Splitters

BOROFLOAT® (Borosilicate) Beam Splitters

N-BK7® Beam Splitters

S-BSL7 Beam Splitters

B 270® Beam Splitters

Plate Beam Splitter Manufacturing Limits

Manufacturing limits depend upon the part size and substrate material and should be used as a general reference. Please contact a Sales Engineer, who will gladly discuss our capabilities based on your specifications.



Diameter ≤ 300mm
Length / Width ≤ 225mm x 200mm
Thickness ≤ 100mm
Thickness Tolerance ± 0.01mm
Reflection/Transmission (R:T) 90:10 – 10:90
Cosmetics (MIL-PRF-13830B) 60-40 to 20-10
Surface Roughness – before coating ≥ 5 Ǻ rms
Reflected Wavefront Error (RWE) – before coating ≥ 1/20 wave over clear aperture
Transmitted Wavefront Error (TWE)* – before coating ≥ 1/20 wave over clear aperture
Clear Aperture ≤ 95%
*Interferometric Scale Factor (ISF) of 0.5 – Single-Pass

Plate Beam Splitter Types

Polarized Plate Beam Splitters

Polarized Plate Beam Splitters

Polarized plate beam splitters are often used to split or combine two perpendicular light sources — based upon the state of polarization (not intensity). Polarizing plate beam splitters can be custom manufactured for large angle apertures, consistently high throughput and exceptional uniformity and contrast.

Unpolarized Plate Beam Splitters

Unpolarized Plate Beam Splitters

Unpolarized plate beam splitters, or non-polarizing beam splitters, are designed to maintain polarization, and are ideal for laser beam manipulation applications involving critical polarization control. Non-polarizing plate beam splitters can be fabricated in various sizes and shapes, with different coatings to maintain polarization and protect against laser damage.

Ultraviolet (UV) Plate Beam Splitters

Ultraviolet (UV) Plate Beam Splitters

UV plate beam splitters are designed for different transmission and reflection ratios in the ultraviolet (UV) spectrum and are ideal for spectroscopy, medical, and fluorescence imaging and other applications involving the 250-450nm wavelength range.

Visible (VIS) Plate Beam Splitters

Visible (VIS) Plate Beam Splitters

Visible plate beam splitters offer an ideal combination of high performance yet require minimal substrate thickness. As the name implies, visible plate beam splitters can be custom fabricated for different shapes, sizes, and coatings for various ratios in the visible wavelength spectrum 400 — 700nm.

Infrared (IR) Plate Beam Splitters

Infrared (IR & NIR) Plate Beam Splitters

Infrared plate beam splitters can be fabricated in various sizes and shapes to meet the most demanding infrared (IR) applications including near-infrared (NIR) 700-1100nm, mi-infrared 2-8µm, and extended mid-infrared 7-14µm ranges.

Plate Beam Splitter Shapes

Below are some of the standard plate beam splitter shapes that Sydor Optics customers frequently order. Of course, Sydor Optics can manufacture custom plate beam splitters — with various shapes and sizes — using CNC Glass Machining or Laser Machining capabilities to meet your specific needs.

Circular Beam Splitters

Square Beam Splitters

Rectangular Beam Splitters

Elliptical Beam Splitters

Plate Beam Splitter Applications

Heads Up Displays (HUD)

Imaging Systems

Laser Systems

Fluorescence Imaging