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Wire Grid Beamsplitter Cube in 30 mm Cage Cube


  • Polarizes and Splits Wavelengths from 400 to 700 nm
  • High Extinction Ratio: >1 000:1 for Transmitted Beam
  • SM1 and 30 mm Cage System Compatible
  • Engraved Housing

CCM1-WPBS254

30 mm Wire Grid Beamsplitter

Application Idea

The CCM1-WPBS254 can be used in conjunction with a linear polarizer and a quarter-wave plate to create a basic isolator.

Related Items


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Wire Grid Beamsplitter Diagram
Transmission and Reflection of Light Through a Wire Grid Polarizing Beamsplitter Cube
(Not to Scale)
Top View of Thorlabs Wire Grid Beamsplitter Engraving
Click for Details

Each mounted wire grid beamsplitter cube is engraved with a ray diagram for one of the two preferred entrance faces.

Features

  • Transmits P-Polarized Light and Reflects S-Polarized Light
  • High Extinction Ratio
    • TP:TS > 1 000:1 (AOI: 0° - 5°)
    • TP:TS > 100:1 (AOI: 0° - 25°)
  • Antireflective (AR) Coatings for 400 - 700 nm (Ravg < 0.5% @ 0° AOI)
  • 1" (25.4 mm) Cubes in 30 mm Cage System Compatible Mounts
  • Four SM1-Threaded (1.035"-40) Ports
  • Bottom-Located 8-32 or M4 Tap for Post Mounting

Thorlabs offers wire grid polarizing beamsplitter cubes mounted in 30 mm cage system compatible housings with SM1-threaded ports. The mounted cubes consist of an array of parallel metallic wires between two N-BK7 prisms joined with optical cement. Wire grid polarizers transmit radiation with an electric field vector perpendicular to the wire and reflect radiation with the electric field vector parallel to the wire. This cube separates the s- and p-polarized components by reflecting the s-polarized component at the wire grid, while allowing the p-polarized component to pass. Due to surface reflections, the reflected beam contains both polarizations.

These beamsplitter cubes have a larger angle of incidence (AOI) than traditional broadband polarizing beamsplitter cubes. For the highest polarization extinction ratio, use the transmitted beam, which offers an extinction ratio of TP:TS > 1 000:1 for an AOI from 0° to 5°. For higher AOI (5° to 25°), this cube can maintain an extinction ratio of TP:TS > 100:1. These beamsplitter cubes are coated with an AR coating designed for 400 - 700 nm (Ravg < 0.5% @ 0° AOI). 

The wire grid is sandwiched between the hypotenuses of the two prisms that make up the cube. Then, optical cement is used to bind the two prism halves together (refer to the diagram above). Light can be input into any of the polished faces to separate the s- and p-polarizations. One possible orientation is engraved on the top of the cage cube.

A bottom-located 8-32 or M4 tap is included on each housing for post mounting. The housings feature four SM1-threaded entrance and exit ports for compatibility with our SM1 (1.035"-40) lens tubes. Four 4-40 tapped holes surrounding each port provide compatibility with our 30 mm cage systems. These mounted beamsplitters can be connected to other cage cubes through the use of our cage rods and ERSCA adapters.

We also offer unmounted versions of our wire grid beamsplitters in various sizes. Custom beamsplitter cubes can be ordered by contacting Tech Support. For high-power applications, we also offer high-power polarizing beamsplitting cubes that have damage thresholds greater than 10 J/cm2. We also offer polarizing beamsplitter cubes at laser line wavelengths, which have a high extinction ratio of >3 000:1 (TP:TS).

Item # CCM1-WPBS254 CCM1-WPBS254/M
Design Wavelength 400 - 700 nm
AR Coating Ravg < 0.5% @ 0° AOI for 400 - 700 nm
Beamsplitter Cube Item # WPBS254-VIS
Beamsplitter Cube Material N-BK7
Cage Cube Material Anodized Aluminum
Extinction Ratioa Tp:Ts > 1 000:1 @ 0° - 5° AOI
Tp:Ts > 100:1 @ 0° - 25° AOI
Transmission Tp > 75% (Avg.) @ 0° AOI for 400 - 700 nm
Reflectance Rs > 70% @ 0° - 25° AOI for 400 - 700 nm
Transmitted Beam Deviation <20 arcmin
Reflected Beam Deviation 90° ± 20 arcmin
Clear Aperture >Ø22.9 mm
Transmitted Wavefront Error <λ/4 @ 633 nm
Dimensions (L × W × H) 1.50" × 1.50" × 1.50" (38.1 mm × 38.1 mm × 38.1 mm)
Post Mount 8-32 M4 x 0.7
  • The extinction ratio (ER) is the ratio of maximum to minimum transmission of a sufficiently linearly polarized input. When the transmission axis and input polarization are parallel, the transmission is at its maximum; rotate the polarizer by 90° for minimum transmission.

Polarization Window, Straight vs. Coiled
Click to Enlarge

Click for Raw Data
The graph above shows the measured extinction ratio (ER) for transmitted light for light incident upon one of the entrance faces. The extinction ratio (also known as contrast) is the ratio of the maximum transmission of a sufficiently linearly polarized signal when the polarizer’s axis is aligned with the signal to the minimum transmission when the polarizer is rotated by 90°. The plotted data is given for AOIs of 0° and ±25°.

Polarization Window, Straight vs. Coiled
Click to Enlarge

Click for Raw Data
The graph above shows the measured transmission through the wire grid polarizing cube for p-polarized light for light incident upon one of the entrance faces. The plotted data is given for AOIs of 0° and ±25°.

Polarization Window, Straight vs. Coiled
Click to Enlarge

Click for Raw Data
The graph above shows the measured transmission through the wire grid polarizing cube for s-polarized light for light incident upon one of the entrance faces. The plotted data is given for AOIs of 0° and ±25°.

Polarization Window, Straight vs. Coiled
Click to Enlarge

Click for Raw Data
The graph above shows the measured reflectance from the wire grid polarizing cube for p-polarized light for light incident upon one of the entrance faces. The plotted data is given for AOIs of 0° and ±25°.

Polarization Window, Straight vs. Coiled
Click to Enlarge

Click for Raw Data
The graph above shows the measured reflectance from the wire grid polarizing cube for s-polarized light for light incident upon one of the entrance faces. The plotted data is given for AOIs of 0° and ±25°.

Polarizer Selection Guide

Thorlabs offers a diverse range of polarizers, including wire grid, film, calcite, alpha-BBO, rutile, and beamsplitting polarizers. Collectively, our line of wire grid polarizers offers coverage from the visible range to the beginning of the Far-IR range. Our nanoparticle linear film polarizers provide extinction ratios as high as 100 000:1. Alternatively, our other film polarizers offer an affordable solution for polarizing light from the visible to the Near-IR. Next, our beamsplitting polarizers allow for use of the reflected beam, as well as the more completely polarized transmitted beam. Finally, our alpha-BBO (UV), calcite (visible to Near-IR), rutile (Near-IR to Mid-IR), and yttrium orthovanadate (YVO4) (Near-IR to Mid-IR) polarizers each offer an exceptional extinction ratio of 100 000:1 within their respective wavelength ranges.

To explore the available types, wavelength ranges, extinction ratios, transmission, and available sizes for each polarizer category, click More [+] in the appropriate row below.

Wire Grid Polarizers
Film Polarizers
Beamsplitting Polarizers
alpha-BBO Polarizers
Calcite Polarizers
Quartz Polarizers
Magnesium Fluoride Polarizers
Yttrium Orthovanadate (YVO4) Polarizers
Rutile Polarizers
  • Click on the graph icons in this column to view a transmission curve for the corresponding polarizer. Each curve represents one substrate sample or coating run and is not guaranteed.
  • Mounted in a protective box, unthreaded ring, or cylinder.
  • Available unmounted or in an SM05-threaded (0.535"-40) mount that indicates the polarization axis.
  • Available unmounted or in an SM1-threaded (1.035"-40) mount that indicates the polarization axis.
  • Available unmounted or mounted in cubes for cage system compatibility.
  • Calcite's transmittance of light near 350 nm is typically around 75% (see Transmission column).
  • Available unmounted or in an unthreaded Ø1/2" housing.
  • The transmission curves for calcite are valid for linearly polarized light with a polarization axis aligned with the mark on the polarizer's housing.
  • The 1064 nm V coating corresponds to a -C26 suffix in the item number.
  • Available unmounted or mounted in a protective box or unthreaded cylinder that indicates the polarization axis.

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Thorlabs' portfolio contains many different kinds of beamsplitters, which can split beams by intensity or by polarization. We offer plate and cube beamsplitters, though other form factors exist, including pellicle and birefringent crystal. Many of our beamsplitters come in premounted or unmounted variants. Below is a complete listing of our beamsplitter offerings. To explore the available types, wavelength ranges, splitting/extinction ratios, transmission, and available sizes for each beamsplitter category, click More [+] in the appropriate row below. 

Non-Polarizing Beamsplitters

Plate Beamsplitters
Cube Beamsplitters
Pellicle Beamsplitters
  • 45° AOI Unless Otherwise Noted

Polarizing Beamsplitters

Plate Beamsplitters
Cube Beamsplitters
Birefringent Crystal Beamsplitters
  • Mounted in a protective box, unthreaded ring, or cylinder that indicates the polarization axis.
  • Available unmounted or mounted in a protective box or unthreaded cylinder that indicates the polarization axis.

Other Beamsplitters

Other Beamsplitters

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
CCM1-WPBS254 Support Documentation
CCM1-WPBS25430 mm Cage Cube-Mounted Wire Grid Beamsplitter Cube, 400 - 700 nm, 8-32 Tap
$514.54
Today
+1 Qty Docs Part Number - Metric Price Available
CCM1-WPBS254/M Support Documentation
CCM1-WPBS254/M30 mm Cage Cube-Mounted Wire Grid Beamsplitter Cube, 400 - 700 nm, M4 Tap
$514.54
Today
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