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alpha-BBO Glan-Laser Polarizers


  • Designed for High-Power Laser Applications
  • Extinction Ratio: 100,000:1
  • Laser Quality α-BBO Crystal

GLB10-UV

GLB10

GLB5-405

GLB10 Polarizer and 
SM1PM10 Mount on a 
PRM1 Rotation Mount

Related Items

Alpha-BBO Glan-Laser Polarizers Divert Ordinary Rays, Leaving Highly Polarized Extraordinary Rays (Aligned with the "Polarization Axis" Mark on the Housing) Passing Through the Polarizer

Transmission
Click to Enlarge

Click Here for Raw Data

Features

  • Extinction Ratio for Output Beam: 100,000:1 (See Diagram Below for Details)
  • Fabricated from the Highest-Grade, Laser-Quality α-BBO
  • Three Available Coatings
    • 210 - 450 nm (centered at 266 nm), Ravg < 1.5%
    • 220 - 370 nm, Ravg < 0.5%
    • VAR for 405 nm, Ravg < 0.25%
  • High Damage Threshold: 5 J/cm2 (10 ns pulse, 10 Hz, Ø0.347 mm Spot Size, @ 355 nm)
  • Low Scatter
  • Wavefront Distortion ≤ λ/8 Over Clear Aperture (Excluding Side Ports)
  • Surface Quality
    • 20/10 Scratch-Dig on Input and Exit Faces
    • 40/20 Scratch-Dig on Side Ports
  • Air-Spaced Design

The Glan-Laser α-BBO Polarizer is specifically designed to deal with high-energy, short-wavelength laser light. Like our Glan-Taylor and Glan-Laser Calcite Polarizers, these polarizers are ideal for applications requiring extremely high polarization purity (100,000:1), high damage threshold (5 J/cm2, 10 ns pulse, 10 Hz, 0.347 mm Spot Size, @ 355 nm), and transmisison in the UV (210 - 450 nm). A significant amount of scattered unpolarized light escapes the polarizers. As a result, the escape ray (ordinary ray) is not purely polarized and should not be used for polarization dependent applications. 

Two polished side exit ports are provided to allow bidirectional use of the prism polarizer. These side ports also ensure that the rejected light from high-power lasers can safely exit the polarizer. Glan-Laser Polarizers are designed to work with well collimated light beams. Divergent beams will produce multiple output beams.

The polarizers are available with three antireflection coatings: a single-layer MgF2 antireflection coating (SLAR-MgF2), a UV AR coating, or a V Coating optimized for 405 nm. The SLAR coating features good broadband UV performance with low reflectance (<1.5%) from 210 to 450 nm while the UV AR coating provides exceptionally low reflectance (<0.5%) from 220 to 370 nm. The 405 nm V coating provides even less reflectance (<0.25%) than the UV coating at 405 nm. See the Graphs tab for more information.

The input and output faces are polished to a laser quality 20-10 scratch-dig surface finish to minimize scattering of the transmitted extraordinary polarization component of the laser beam or light field. The ordinary polarization component is reflected at a 61o angle (wavelength dependent) and exits the polarizer through one of the two side ports.

For compatibility with Thorlabs' selection of rotation mounts and other optomechanics, these polarizers can be mounted in our Polarizing Prism Mounts, which are available for both 5 mm (SM05PM5) and 10 mm polarizers (SM1PM10). Thorlabs also provides Glan-Taylor polarizers.

Item #GLB5GLB10
Extinction Ratioa 100,000:1
Substrate Laser Quality α-BBOb
(Low Scatter)
Design High Laser Damage Threshold
Air-Spaced Design
Transmission Range 210 - 450 nm
Available AR Coatingsc SLAR MgF2 (210 - 450 nm), Ravg< 1.5%
UV (220 - 370 nm), Ravg< 0.5%
V-Coat (405 nm), Ravg< 0.25%
Damage Threshold 5 J/cm2 (10 Hz, Ø0.347 mm Spot Size, 10 ns Pulses @ 355 nm)
Wavefront Distortion ≤ λ/8 Over Clear Aperture
Surface Quality (Input and Output Faces) 20/10 Scratch/Dig
Surface Quality (Side Ports) 40/20 Scratch/Dig
Aperture 5 mm x 5 mm 10 mm x 10 mm
Prism Dimensions (W x L) 6.5 mm x 7.5 mm 12 mm x 13.7 mm
  • Extinction ratio is only for the output ray (see drawing below). Measured at 405 nm and 355 nm. The extinction ratio (ER) is the ratio of the maximum transmission of a linear polarized signal when the polarizer’s axis is aligned with the signal to the minimum transmission when the polarizer is rotated by 90°.
  • Click Link for Detailed Specifications on the Substrate
  • The escape windows (perpendicular to input / exit faces) are not coated. See the Graphs Tab for more information.
Note: Since α-BBO is a relatively soft material, care must be taken when cleaning. The coated faces of the polarizer can be gently cleaned with solvent and air. The escape faces (perpendicular to the input / exit faces) are also extremely delicate. Do not touch any faces if possible. Cleaning should be light and at a glancing angle. If these surfaces must be wiped, use only solvent-moistened cotton or untreated facial tissues.

Field of View Angle Orientation

Alpha-BBO FOV
A significant amount of scattered unpolarized light escapes the polarizers. As a result, the escape ray (o-ray) is not purely polarized and should not be used for polarization dependent applications.

The typical transmission and reflectivity of the α-BBO Glan-Laser polarizers are shown in the graphs below. The blue shading indicates the region for which the AR coating is optimized (see Specs tab for more information). The reflectivity plots represent the performance of the coating only, not including internal losses of the polarizer. The transmission plots include both both reflectivity and transmission through the polarizer (including any internal losses).

The plots below apply to the GLB10 and GLB5 α-BBO Glan-Laser polarizers.

The plots below apply to the GLB10-UV and GLB5-UV α-BBO Glan-Laser polarizers.

The plots below apply to the GLB10-405 and GLB5-405 α-BBO Glan-Laser polarizers.

Note: Short wavelength cutoff is due to the cut angle of the α-BBO prism, not the reflectivity or transmission of the material.

UV Glan-Laser Polarizer Schematic Diagram

Glan Laser Specifications

Item #GLB5GLB10
W 6.5 mm 12 mm
L 7.5 mm 13.7 mm
A 9.5 mm 16 mm
B 12.7 mm 19.2 mm

Polarization-Dependent Refraction - Glan Laser α-BBO Polarizer


Polarization-Dependent Refraction

General

Thorlabs' α-BBO polarizers are all based on high-grade, birefringent α-BBO crystals. Due to the birefringent nature of α-BBO, waves polarized in the direction of the optical axis propagate with a different index of refraction than waves polarized orthogonally to the optical axis. In our Glan-Laser polarizers, this birefringence causes the selective reflection of one polarization state of an incident beam and the transmission of the other orthogonal polarization state. When unpolarized light is incident on the optic, extraordinary rays travel straight through the polarizer while ordinary rays are reflected at an angle that depends on the light's wavelength and the cut of the polarizer.

A Glan-Laser or Glan-Taylor polarizer can be designed as either a polarization splitter/combiner or as a polarizer element that removes the angled, orthogonally polarized component of a beam. Our polarizers are typically built out of two prisms, as shown in the drawing to the right. Since α-BBO is a soft crystal that is easily damaged, all of our α-BBO polarizers are offered in metal housings. With convenient threadings and adapters, these housings can easily be mounted into our opto-mechanical products.

Field of View

α-BBO polarizers feature a field of view (FOV) that varies with both wavelength and entrance orientation. The FOV of these prisms must be considered during alignment and collimation procedures. The side of the polarizer with the escape window has an FOV that decreases with increasing wavelength (FOV 1). The opposite side has an FOV that increases at longer wavelengths (FOV 2).

Field of View Angle Orientation


Alpha-BBO FOV

Transmission

Thorlabs uses only the highest quality synthetic α-BBO in our polarizing prisms. The transmission curves of the α-BBO polarizers are shown on the Overview tab. These curves also represent the transmission of the GLB5, GLB5-UV, and GLB5-405. Variations during the manufacturing of the α-BBO crystal affect the transmission curve and the damage threshold rating.

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 high thresholds for laser damage, up to 25 W/cm2, as well as 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), and rutile (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
Polarizer Type Wavelength Range Extinction Ratio Transmissiona Available Sizes
alpha-BBO Glan-Laser Polarizers 210 nm - 450 nm 100,000:1 5 mmb and 10 mmb
(Clear Aperture, Square)
220 nm - 370 nm
405 nm
Calcite Polarizers
Polarizer Type Wavelength Range Extinction Ratio Transmissiona,g Available Sizes
Glan-Laser Calcite Polarizers 350 nmf - 2.3 µm (Uncoated) 100,000:1 5 mmb, 10 mmi, and 15 mmb
(Clear Aperture, Square)
350 nmf - 700 nm (A Coated)
650 nm - 1050 nm (B Coated)
1050 nm - 1700 nm (C Coated)
1064 nm (V Coated)h
Glan-Taylor Calcite Polarizers 350 nmf - 2.3 µm (Uncoated) 5 mmb, 10 mmb, and 15 mmb
(Clear Aperture, Square)
350 nmf - 700 nm (A Coated)
650 nm - 1050 nm (B Coated)
1050 nm - 1700 nm (C Coated)
Glan-Thompson Calcite Polarizers
(Unmounted or Mounted)
350 nmf - 2.3 µm (Uncoated) 5 mmi and 10 mmi
(Clear Aperture, Square)
350 nmf - 700 nm (A Coated)
650 nm - 1050 nm (B Coated)
Double Glan-Taylor Calcite Polarizers 350 nmf - 2.3 µm (Uncoated) 9 mmb
(Clear Aperture, Square)
Calcite Beam Displacers 350 nmf - 2.3 µm (Uncoated) 10 mmb
(Clear Aperture, Square)
Wollaston Prism Polarizers 350 nmf - 2.3 µm (Uncoated) 10 mmi
(Clear Aperture, Square)
350 nmf - 700 nm (A Coated)
650 nm - 1050 nm (B Coated)
Rutile Polarizers
Polarizer Type Wavelength Range Extinction Ratio Transmissiona Available Sizes
Rutile TiO2 Polarizers 2.2 µm - 4 µm 100,000:1 9.1 mm x 9.5 mm x 9.5 mmb and
10.7 mm x 15.9 mm x 15.9 mmb
  • 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 that indicates the polarization axis.
  • 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).
  • 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.
Click the Support Documentation icon document icon or Part Number below to view the available support documentation
Part NumberProduct Description
GLB10 Support Documentation GLB10:Glan-Laser alpha-BBO Polarizer, 10.0 mm CA, SLAR MgF2 (210 - 450 nm)
GLB10-405 Support Documentation GLB10-405:Glan-Laser alpha-BBO Polarizer, 10.0 mm CA, V Coated (405 nm)
GLB10-UV Support Documentation GLB10-UV:Glan-Laser alpha-BBO Polarizer, 10.0 mm CA, UV Coating (220 - 370 nm)
Part NumberProduct Description
GLB5 Support Documentation GLB5:Glan-Laser alpha-BBO Polarizer, 5.0 mm CA, SLAR MgF2 (210 - 450 nm)
GLB5-405 Support Documentation GLB5-405:Glan-Laser alpha-BBO Polarizer, 5.0 mm CA, V Coated (405 nm)
GLB5-UV Support Documentation GLB5-UV:Glan-Laser alpha-BBO Polarizer, 5.0 mm CA, UV Coating (220 - 370 nm)

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Posted Comments:
Poster:van.rudd
Posted Date:2014-12-09 12:51:59.21
I bought the GLB10 to act as a variable beamsplitter based on the specifications on your "overview" page. Once I received them I found out the "100,000:1" extinction only applies for the straight through port and the side port has awful polarization purity. Please make this clear on the "overview" page and don't bury that information as a footnote on one of the specification graphs. I expect better than this from Thorlabs. Thanks.
Poster:myanakas
Posted Date:2014-12-09 03:46:00.0
Response from Mike at Thorlabs: Thank you for you feedback. I apologize for any confusion that the presentation caused. Based on your feedback we have updated the presentation to make the extinction ratio spec more clear.
Poster:rudolph
Posted Date:2013-05-31 05:41:53.29
Können Sie 3 Stück a-BBO Glan-Laser Polarisatoren mit freier Apertur 5mm ohne Beschichtung anbieten?
Poster:jlow
Posted Date:2013-05-31 10:36:00.0
The coating serves as protection to the alpha-BBO. We will contact you to discuss this further along with other possible solutions.
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Glan-Laser alpha-BBO Polarizer, SLAR Coating

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
GLB5 Support Documentation
GLB5Glan-Laser alpha-BBO Polarizer, 5.0 mm CA, SLAR MgF2 (210 - 450 nm)
$672.00
Today
GLB10 Support Documentation
GLB10Glan-Laser alpha-BBO Polarizer, 10.0 mm CA, SLAR MgF2 (210 - 450 nm)
$788.00
Today

Glan-Laser alpha-BBO Polarizer, UV Coating

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
GLB5-UV Support Documentation
GLB5-UVGlan-Laser alpha-BBO Polarizer, 5.0 mm CA, UV Coating (220 - 370 nm)
$725.00
Today
GLB10-UV Support Documentation
GLB10-UVGlan-Laser alpha-BBO Polarizer, 10.0 mm CA, UV Coating (220 - 370 nm)
$840.00
Today

Glan-Laser alpha-BBO Polarizer, 405 nm V-Coated

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
GLB5-405 Support Documentation
GLB5-405Glan-Laser alpha-BBO Polarizer, 5.0 mm CA, V Coated (405 nm)
$725.00
Today
GLB10-405 Support Documentation
GLB10-405Glan-Laser alpha-BBO Polarizer, 10.0 mm CA, V Coated (405 nm)
$840.00
Today
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