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MIR Wire Grid Polarizers on Silicon Substrates


  • Wavelength Range: 3 - 5 µm or 7 - 15 µm
  • Ø25.0 mm, 12.5 mm Square, 25.0 mm Square, or 50.0 mm Square
  • >1000:1 or >10 000:1 Extinction

WP12LM-IRA

12.5 mm x 12.5 mm

WP25M-IRC

Ø25.0 mm

WP25LM-IRA

25.0 mm x 25.0 mm

WP50LM-IRC

50.0 mm x 50.0 mm

WP25M-IRA
Mounted in an
RSP1X15 Rotation
Mount

Related Items


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Engraved Round PolarizerEngraved Square Polarizer
The engraving on the housing is parallel to polarized transmitted light and perpendicular to the orientation of the wires.

Features

  • Polarize Light from 3 - 5 µm or 7 - 15 µm
  • Extinction Ratio:
    • 3 - 5 µm (-IRA): >1000:1
    • 7 - 15 µm (-IRC): >10 000:1
  • Offered in Four Sizes
    • Ø25.0 mm
    • 12.5 mm x 12.5 mm
    • 25.0 mm x 25.0 mm
    • 50.0 mm x 50.0 mm
  • Anodized Aluminum Mount with Transmission Axis Indicated

The mounted wire grid polarizers on silicon substrates sold here are designed to provide high extinction over two spectral ranges in the mid-IR: 3 - 5 µm (3333 - 2000 cm-1) or 7 - 15 µm (1429 - 667 cm-1). The 3 - 5 µm versions (denoted by -IRA) offer >1000:1 extinction and >85% average transmission over their specified range, while the 7 - 15 µm versions (denoted by -IRC) offer >10 000:1 extinction and >75% average transmission over their specified range. Wavelength-dependent plots of the transmission are available in the Specs tab. The polarizers are recessed inside Ø25.0 mm, 12.5 mm square, 25.0 mm square, or 50.0 mm square mounts fabricated from anodized aluminum. As shown by the drawings to the right, the mounts are engraved with the polarization axis of the transmitted light.

These MIR polarizers consist of a linearly spaced wire grid pattern that is deposited onto an AR-coated silicon substrate. Silicon was chosen because it offers good transmission in the mid-IR wavelength range. Because the wire grid absorbs and reflects radiation that is polarized parallel to the grid, the polarization of the transmitted radiation is perpendicular to the wires. These polarizers feature a mark on the housing to indicate the transmission axis (see diagrams to the right).

For smooth attenuation over the specified wavelength range and fine control over the output polarization direction, we recommend the Ø25.0 mm versions, which are well suited for use with our family of rotation mounts for Ø1" optics. The 12.5 mm square, 25.0 mm square, and 50.0 mm square versions can be secured in a cylindrical lens mount. Since our cylindrical lens mounts do not provide rotation, the square polarizers are best for applications that only require horizontal or vertical polarization.

The surface of a wire grid polarizer, like any diffraction grating, is extremely delicate. Never touch the surface of the polarizer, and only handle it by the edge. Careful removal of dust by gentle air flow is the only recommended cleaning procedure.

For broadband applications in the MIR, Thorlabs offers holographic wire grid polarizers for the 2 - 30 µm spectral range. In addition, we have wire grid polarizers on glass substrates for the 250 nm - 4 µm spectral range, which help enable the use of a visible alignment beam in a mid-IR experiment. For our complete selection of polarizers, please see the Polarizer Guide tab.

Item # WP12LM-IRA WP25M-IRA WP25LM-IRA WP50LM-IRA WP12LM-IRC WP25M-IRC WP25LM-IRC WP50LM-IRC
Wavelength Range 3 - 5 µm (3333 - 2000 cm-1) 7 - 15 µm (1429 - 667 cm-1)
Extinction Ratioa >1000:1 Over Entire Wavelength Range >10 000:1 Over Entire Wavelength Range
Transmissionb >85% (Average) Over Wavelength Range >75% (Average) Over Wavelength Range
Housing Size 12.5 mm x 12.5 mm Ø25.0 mm 25.0 mm x 25.0 mm 50.0 mm x 50.0 mm 12.5 mm x 12.5 mm Ø25.0 mm 25.0 mm x 25.0 mm 50.0 mm x 50.0 mm
Housing Thickness 5.8 mm 5.8 mm 5.8 mm 5.8 mm 5.8 mm 5.8 mm 5.8 mm 5.8 mm
Clear Aperture 6.0 mm x 6.0 mmc Ø19.0 mm 18.0 mm x 18.0 mmc 42.0 mm x 42.0 mmc 6.0 mm x 6.0 mmc Ø19.0 mm 18.0 mm x 18.0 mmc 42.0 mm x 42.0 mmc
Transmission Axis
Accuracyd
±2°
Angle of Incidence ±20°
Distance Between
Wires
144 nm
Wire Thickness 65 nm
Thermal Expansion 2.6 x 10-6 per °C
Substrate AR-Coated Silicon
  • 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.
  • Specified at normal incidence for light polarized parallel to the transmission axis of the polarizer.
  • As shown by the drawing below, our square mid-IR polarizers have rounded corners that slightly reduce the clear aperture of the optic.
  • With respect to the engraved line on the housing, as shown in the drawings below.
Engraved Round PolarizerEngraved Square Polarizer
Engraving is Parallel to Transmitted Light Polarization

 

Transmission of -IRA Polarizers

Transmission of IRA Polarizers
Click to Enlarge

Excel Spreadsheet Containing Raw Data
Transmission of 3 - 5 µm Polarizers

Extended Transmission of IRA Polarizers
Click to Enlarge

Excel Spreadsheet Containing Raw Data
Extended-Range Transmission of 3 - 5 µm Polarizers
The shaded region in this graph denotes the range over which these polarizers provide >1000:1 extinction.

Transmission of -IRC Polarizers

Transmission of IRC Polarizers
Click to Enlarge

Excel Spreadsheet Containing Raw Data
Transmission of 7 - 15 µm Polarizers

Extended Transmission of IRC Polarizers
Click to Enlarge

Excel Spreadsheet Containing Raw Data
Extended-Range Transmission of 7 - 15 µm Polarizers
The shaded region in this graph denotes the range over which these polarizers provide >10 000:1 extinction.


Posted Comments:
georg.ramer  (posted 2018-10-11 18:06:16.153)
What is the extinction ratio of the IRC wiregrid polarizers outside the specified transmission range of 7 to 15 um?
YLohia  (posted 2018-10-15 10:34:32.0)
Hello, thank you for contacting Thorlabs. The transmission in the 2-16um extended range is given in the Specs tab.
hasal  (posted 2014-12-08 12:43:40.217)
Hello, can you tell me which value of extinction ration is related to the WP12LM-IRA? Do you offer all of the listed types in two variations with 1:1000 and 1:10 000? Thanks for explanation.
myanakas  (posted 2014-12-08 08:54:22.0)
Response from Mike at Thorlabs: Thank you for your feedback. The extinction ratio for the WP12LM-IRA is >1000:1. This can be found in the table on the "Specs" tab or on the support drawing, which can be found by clicking on the red "Decs" icon next to the part number (http://www.thorlabs.de/thorcat/TTN/WP12LM-IRA-AutoCADPDF.pdf). Part numbers ending in -IRA have an extinction ration of >1000:1 and part numbers ending in -IRC have an extinction ratio of >10000:1. We will work to make this more clear on the webpage.
zachary.flom  (posted 2014-09-13 21:50:45.263)
Will WP25M-IRA pass a decent fraction of light at 650nm? I just want to make sure our pointing lasers will still be visible after passing through two or three of these (assuming the pointing laser is correctly polarized to pass through). Thanks.

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.

MIR Wire Grid Polarizers, 3 - 5 µm

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
WP12LM-IRA Support Documentation
WP12LM-IRA12.5 mm x 12.5 mm Mounted Wire Grid Polarizer, 3 - 5 µm
$854.87
Today
WP25M-IRA Support Documentation
WP25M-IRAØ25.0 mm Mounted Wire Grid Polarizer, 3 - 5 µm
$1,430.56
Today
WP25LM-IRA Support Documentation
WP25LM-IRA25.0 mm x 25.0 mm Mounted Wire Grid Polarizer, 3 - 5 µm
$1,390.52
Today
WP50LM-IRA Support Documentation
WP50LM-IRA50.0 mm x 50.0 mm Mounted Wire Grid Polarizer, 3 - 5 µm
$1,960.80
Today

MIR Wire Grid Polarizers, 7 - 15 µm

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
WP12LM-IRC Support Documentation
WP12LM-IRC12.5 mm x 12.5 mm Mounted Wire Grid Polarizer, 7 - 15 µm
$854.87
Today
WP25M-IRC Support Documentation
WP25M-IRCØ25.0 mm Mounted Wire Grid Polarizer, 7 - 15 µm
$1,430.56
5-8 Days
WP25LM-IRC Support Documentation
WP25LM-IRC25.0 mm x 25.0 mm Mounted Wire Grid Polarizer, 7 - 15 µm
$1,390.52
Today
WP50LM-IRC Support Documentation
WP50LM-IRC50.0 mm x 50.0 mm Mounted Wire Grid Polarizer, 7 - 15 µm
$1,960.80
Today
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Last Edited: Nov 18, 2013 Author: Dan Daranciang