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Yttrium Orthovanadate (YVO₄) Beam Displacers


  • Separate an Input into Two Orthogonally Polarized Beams
  • Yttrium Orthovanadate Substrate is Transparent from 488 nm to 3.4 µm
  • Option for 2000 nm V-Coated Beam Displacers, R < 0.25%
  • Mounted and Unmounted Optics

BDY12

Mounted Beam Displacer

BDY12U

Unmounted Beam Displacer

Application Idea

A BDY12-2000 Mounted Beam Displacer Attached to a Rotation Mount Using a Ø1/2" Lens Tube

BDY12-2000

Mounted Beam Displacer

Related Items


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Item # BDY12(U) BDY12(U)-2000
Substrate Materiala Yttrium Orthovanadate (YVO4)
Substrate Spectral Range
(Click for Graph)
488 nm - 3.4 µm
AR Coating (Click for Graph) N/A 2000 nm V Coating
AR Coating Reflectance (0° AOI) R < 0.25% at 2000 nm
Beam Separation (@ 2000 nm)
1.2 mm
Clear Aperture >3 mm x 5 mm Ellipse
Beam Deviation <30 arcsec Between Output Beams
Surface Flatness λ/10 at 633 nm
Surface Quality 40-20 Scratch-Dig
  • Click Link for Detailed Specifications on the Substrate
BDY12 Beam Displacement
Click to Enlarge

Birefringent Beam Displacers Seperate Unpolarized Light into Two Orthogonally Polarized Beams
Birefringent Crystal Beamsplitters
Type Ordinary Ray Anglea Extraordinary Ray Anglea
Calcite Beam Displacers Parallel Parallel
YVO4 Beam Displacers
Rochon Prisms Parallel Deviated
Wollaston Prisms Deviated Deviated
  • With Respect to Input Beam

Features

  • Two Orthogonally Polarized Output Beams
  • 1.2 mm Beam Displacement at 2000 nm
  • Available Uncoated or V-Coated at 2000 nm
  • Outputs Beams Parallel within 30 arcsec
  • Transparent from 488 nm to 3.4 μm
  • Available Unmounted or Mounted in a Ø1/2" Housing

Beam displacing prisms are used to separate an input beam into two orthogonally polarized output beams and can be used as polarizing beamsplitters in applications where the 90° separation generated by polarizing beamsplitter cubes is not desired. Fabricated from yttrium orthovanadate (YVO4), these beam displacers provide a beam separation of 1.2 mm at a wavelength of 2000 nm and can be used with wavelengths from 488 nm to 3.4 μm (see Graphs tab). This beam separation sets an upper limit to the beam size that is appropriate for use with these polarizers. Our D-shaped mirrors are ideal for picking off one of the two polarized beams.

These YVO4 beam displacers are available uncoated or with a V coating that provides <0.25% reflectance at 2000 nm (see the Graphs tab). The BDY12 and BDY12-2000 beam displacers are mounted in Ø1/2" anodized aluminum housings for compatibility with our Ø1/2" lens tubes and Ø1/2" rotation mounts, while the BDY12U and BDY12U-2000 beam displacers are unmounted 12.0 mm x 6.0 mm x 4.0 mm (0.47" x 0.24" x 0.16") optics. All of these beam displacers produce output beams that are parallel to each other to within 30 arcsec.

In addition to these beam displacers, Thorlabs also offers a complete line of polarizers made from a variety of materials, including α-BBO, calcite, quartz, and rutile. We also produce a wide range of other polarization optics and polarization instrumentation.

BDY12 Beam Displacement
Click to Enlarge

Click Here for Raw Data
Transmission Through Uncoated YVO4
BDY12 Beam Displacement
Click to Enlarge

Click Here for Raw Data
Reflectance for the BDY12-2000 and BDYU12-2000 Beam Displacers
BDY12 Beam Displacement
Click to Enlarge

Click Here for Raw Data
The linear separation between the orthogonally polarized output beams varies with wavelength.

Posted Comments:
dodd  (posted 2018-08-23 17:18:42.357)
Does the BDY12-2000 have a known damage threshold? I would like to use it as a polarizing beamsplitter for a 5W CW tunable laser operating in the 2-2.5um wavelength range. Any advice you could provide would be greatly appreciated. Thanks!
YLohia  (posted 2018-08-27 08:35:48.0)
Hello, thank you for contacting Thorlabs. Unfortunately, we do not have a specified damage threshold for the BDY12-2000. That being said, preliminary tests indicate that a CW 5W laser beam with a beam diameter greater than 0.5mm should be fine for the 2-2.4um range. Additionally, >15 J/cm2 @ 20ns, 20Hz @ 1064nm is also expected to be fine in a pulsed application.

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.

Unmounted Beam Displacers

Beam Displacer Mechanical Dimensions
Schematic of the BDY12U Unmounted YVO4 Beam Displacer
  • Unmounted YVO4 Beam Displacers
  • Produces Two Orthogonally Polarized Output Beams
  • Available Uncoated or V-Coated at 2000 nm

These Unmounted Beam Splitters are compact [0.47" x 0.24" x 0.16" (12.0 mm x 6.0 mm x 4.0 mm)], making them ideal for use in OEM applications. They split an input beam into two output beams with orthogonal polarization. The uncoated beam splitter provides excellent transmission from 488 nm to 3.4 µm, while the 2000 nm V-coat minimizes the reflectance at 2000 nm. The line on the beam splitter indicates the optic axis. They can be mounted in a kinematic platform mount or a tip, tilt, and rotation stage.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
BDY12U Support Documentation
BDY12UYVO4 Beam Displacer, 1.2 mm Beam Separation, Unmounted
$275.94
Today
BDY12U-2000 Support Documentation
BDY12U-2000YVO4 Beam Displacer, 1.2 mm Beam Separation, Unmounted, 2000 nm V Coating
$331.12
Today

Mounted Beam Displacers

Beam Displacer Mechanical Dimensions
Schematic of the BDY12 Mounted YVO4 Beam Displacer
  • YVO4 Beam Displacers Mounted in a Ø1/2" Housing
  • Produces Two Orthogonally Polarized Output Beams
  • Available Uncoated or V-Coated at 2000 nm
  • Compatible with SM05 Lens Tube Systems

These Mounted Beam Splitters are seated in Ø1/2" anodized aluminum housings. This housing fits inside our Ø1/2" lens tubes, making them compatible with our Ø1/2" rotation mounts. These beam splitters split an input beam into two output beams with orthogonal polarization. The uncoated beam splitter provides excellent transmission from 488 nm to 3.4 µm, while the
2000 nm V-coat minimizes the reflectance at 2000 nm.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
BDY12 Support Documentation
BDY12YVO4 Beam Displacer, 1.2 mm Beam Separation, Ø1/2" Housing
$304.08
Today
BDY12-2000 Support Documentation
BDY12-2000YVO4 Beam Displacer, 1.2 mm Beam Separation, Ø1/2" Housing, 2000 nm V Coating
$359.26
Today
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