How does a Glan-Thompson polarizer differ from Glan-Taylor and other Glan-type polarizers?

In a Glan-Thompson polarizer, the two birefringent prisms are cemented together with an index-matched optical cement, whereas Glan-Taylor types use an air gap. Cemented Glan-Thompson designs generally offer higher transmission uniformity and better mechanical robustness but have lower laser damage thresholds and a narrower usable spectral range defined by both crystal and cement. Air-spaced Glan types (e.g., Glan-Taylor, Glan-Laser) are preferred for high-power laser applications and broader UV transmission because they avoid cement-related limitations.

What materials and wavelength ranges are typical for Glan-Thompson polarizers?

Most Glan-Thompson polarizers use calcite for visible to near-IR operation, typically from about 350–2300 nm, limited by the crystal and the cement. α-BBO-based Glan-Thompson polarizers support deeper UV operation, often from ~200 nm upward, but with different birefringence and transmission characteristics. Exact usable wavelength ranges depend on the crystal material, cement absorption edge, and AR coating design.

Which key specifications should I consider when selecting a Glan-Thompson polarizer?

Critical parameters include clear aperture, wavelength range, extinction ratio (e.g., 10⁴–10⁵ or higher), transmission, and angular field of view. You should also review the material (calcite vs α-BBO), surface quality, AR coating bandwidth, and acceptable wavefront distortion for your beam quality requirements. For laser use, check the maximum incident power/fluence rating, even though Glan-Thompson types are generally intended for low to moderate power due to the cement layer.

How do acceptance angle, extinction ratio, and AR coatings affect performance comparison between products?

Acceptance angle defines the maximum deviation from normal incidence over which the specified extinction and transmission are maintained; a larger angle improves alignment tolerance but may trade off with extinction performance. Extinction ratio quantifies the polarizer’s ability to suppress the orthogonal polarization; higher values are critical for precision polarization control and contrast-sensitive measurements. Broadband or multi-band AR coatings reduce Fresnel losses and back reflections over the specified spectral range, improving throughput and minimizing interference effects in imaging or metrology setups.

What are typical lead times and customization options for Glan-Thompson polarizers, and what drives pricing?

Standard off-the-shelf Glan-Thompson polarizers usually have lead times from stock to a few weeks, while custom sizes, wavelength-optimized coatings, or nonstandard housings can extend this to several weeks or more. Common customizations include clear aperture, overall length, mounting configuration (e.g., rotation mounts or thread types), and specialized AR or high-durability coatings. Pricing is mainly driven by crystal size and grade, coating complexity, tolerances on angular alignment and surface quality, and any nonstandard mechanical design.

How can I find, compare, and request quotes for Glan-Thompson polarizers on FindLight without creating an account?

On FindLight, navigate to Optics > Polarization Optics > Glan-Thompson Polarizers to see all available listings, then use filters for wavelength range, material, aperture size, and coating type to narrow results. You can open individual product pages to compare specifications such as extinction ratio, transmission, and damage threshold, and then use the built-in “Request Quote” or contact form to send your requirements directly to suppliers. Quote requests and technical inquiries can be submitted without user registration; replies are sent to the email address you provide.

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Glan-Thompson Polarizers

Glan-Thompson Polarizers for Precision Optics

Q: What is a Glan-Thompson polarizer and how does it work?

A Glan-Thompson polarizer is a high-extinction linear polarizer made from two cemented birefringent prisms (typically calcite or α-BBO) with their optical axes oriented to separate ordinary and extraordinary rays. The ordinary ray is totally internally reflected and absorbed by the prism assembly or housing, while the extraordinary ray is transmitted as the polarized output. This geometry provides high extinction ratios and good transmission over the material’s transparency range.

Glan-Thompson Polarizer Calcite 350-2300nm High Extinction Ratio

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Sold by: Photonchina Ships from: China

Specifications
Material:	Calcite, Custom, YVO4, a-BBO
Wavelength Range:	200 – 3500 nm
Max Extinction Ratio:	>= 100:1, >= 1000:1, >= 10000:1
Wavefront Distortion:	<= Lambda/4, <= Lambda/6, <= Lambda/10, <= Lambda/20
Surface Quality (Input, Output Faces):	60-40 scratch-dig, 40-20 scratch-dig, 20-10 scratch-dig, 10-5 scratch-dig

Did You Know?

A Glan–Thompson prism consists of two right-angled prisms made of calcite or other birefringent material, cemented together by their long faces. Due to birefringence, the light incident on the prism splits into two rays, experiencing different refraction - the p-polarized ray (ordinary ray) is totally internally reflected from the calcite-cement interface, leaving the s-polarized ray (extraordinary ray) to be transmitted. Hence this prism acts as a polarizing beam splitter. Glan-Thompson polarizers are ideal for Ultraviolet, Visible, or Near Infrared applications. They have a wide acceptance angle with superior broadband performance and low wavefront distortion.

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Frequently Asked Questions

A Glan-Thompson polarizer is a high-extinction linear polarizer made from two cemented birefringent prisms (typically calcite or α-BBO) with their optical axes oriented to separate ordinary and extraordinary rays. The ordinary ray is totally internally reflected and absorbed by the prism assembly or housing, while the extraordinary ray is transmitted as the polarized output. This geometry provides high extinction ratios and good transmission over the material’s transparency range.

Overview of Glan-Thompson Polarizers

Glan-Thompson Polarizers are prism-based linear polarizers built from two cemented birefringent crystals, typically calcite or α-BBO. They transmit the ordinary or extraordinary ray while absorbing or reflecting the orthogonal polarization, providing a well-defined linear polarization state. Compared with air-spaced designs, Glan-Thompson Polarizers achieve high extinction ratios and compact form factors, making them suitable for lab and OEM optical systems.

Typical Specifications

When evaluating Glan-Thompson Polarizers on FindLight, engineers usually compare:

Material: Calcite for 350–2300 nm; α-BBO for deeper UV down to ~200 nm and higher damage thresholds.
Wavelength range: Defined operating band (e.g., 400–700 nm, 650–1100 nm) with specified transmission and extinction ratio.
Extinction ratio: Often >10⁵:1 for the transmitted polarization; critical for precision polarization analysis and interferometry.
Clear aperture: Common sizes from 3 mm to 20 mm; select based on beam diameter and allowable clipping.
Acceptance angle and FOV: Maximum divergence or field angle to maintain specified extinction and throughput.
Damage threshold: Specified for CW (W/cm²) and pulsed (J/cm²); important for high-power laser applications.
Coatings: AR coatings on input/output faces tuned to the working band to minimize Fresnel losses.

Applications of Glan-Thompson Polarizers

Glan-Thompson Polarizers are used in laser beam conditioning, spectroscopic setups, ellipsometry, imaging polarimetry, and optical metrology where high polarization purity and stable transmission are required. Their cemented construction is well suited to moderate power continuous-wave lasers and many pulsed sources within the specified damage threshold.

Buyer Guidance on FindLight

On FindLight you can compare Glan-Thompson Polarizers across vendors by wavelength range, material, extinction ratio, clear aperture, and damage threshold. Check mechanical form factor (length, mount diameter, thread compatibility) to ensure straightforward integration into existing optical rails or cage systems.

Once you identify suitable Glan-Thompson Polarizers, use the request-a-quote function to obtain pricing, lead time, and customization options (non-standard apertures, custom coatings, or specific wavelength bands). No registration is required to contact suppliers, so you can rapidly collect technical data sheets and quotations for design reviews and procurement workflows.