Polarization Optics
Author: the photonics expert Dr. Rüdiger Paschotta (RP)
Definition: optics used for manipulating the polarization state of light
Related: polarization of lightoptical elementspolarizerswaveplatesdepolarizersFaraday rotatorsFaraday isolatorsFaraday mirrors
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DOI: 10.61835/t0y Cite the article: BibTex BibLaTex plain textHTML Link to this page! LinkedIn
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What is Polarization Optics?
Polarization optics includes optical elements used primarily for manipulating the polarization of light. Often, this is done for other final purposes — for example, for realizing optical isolators or for modulating other properties of light such as optical power or optical phase. Therefore, polarization-optical elements are often found within other devices or systems.
Optical Elements for Manipulation Polarization
Typical elements of polarization optics are:
- Polarizers of various kinds provide transmission which depends on the polarization of light.
- Brewster plates can be inserted in lasers, for example, to enforce linear polarization.
- Waveplates are used to manipulate the polarization state of transmitted light.
- Faraday rotators, often used as part of Faraday isolators or Faraday mirrors, rotate polarization.
- Depolarizers and polarization scramblers can be used for more or less effectively removing polarization of light.
Further, some types of optical modulators — specifically electro-optic modulators — can be used to control polarization states.
Key Characteristics
When selecting polarization optics, several characteristics are of particular importance:
- Extinction ratio: For polarizers, this defines the ratio of transmission for the desired polarization direction to that of the unwanted orthogonal component. High-quality crystal polarizers can achieve extinction ratios exceeding 100,000:1 (($50$) dB).
- Retardance accuracy: For waveplates, the precision of the phase shift (e.g., ($\lambda/4$) or ($\lambda/2$)) is critical. It often depends on temperature and wavelength.
- Bandwidth: Many polarization devices, particularly waveplates and thin-film polarizers, work well only within a limited wavelength range. Achromatic or superachromatic versions offer broader bandwidths.
- Damage threshold: In high-power laser applications, the optical damage threshold is a limiting factor. Cemented components (e.g., Glan–Thompson prisms) typically have lower thresholds than air-spaced or optically contacted versions.
- Acceptance angle: The performance of many polarization devices degrades if the light beam is not perfectly collimated or incident at the correct angle.
Frequently Asked Questions
This FAQ section was generated with AI based on the article content and has been reviewed by the article’s author (RP).
What is polarization optics?
Polarization optics comprises optical elements designed to manipulate the polarization of light, often as part of other devices like optical isolators or power modulators.
What are the main components used in polarization optics?
Common components include polarizers, waveplates for altering polarization states, Faraday rotators for rotating polarization, Brewster plates, and depolarizers for removing polarization.
What are some applications of polarization optics?
Polarization optics is used for various purposes, for example for building optical isolators or for modulating the optical power or optical phase of light.
Suppliers
Sponsored content: The RP Photonics Buyer's Guide contains 237 suppliers for polarization optics. Among them:
Polarization optics ensure stable signal transmission by preserving light polarization. SYLEX offers PM jumpers, fiber arrays, and PANDA-based interconnects with FC, LC, SC, and MU connectors. Ideal for interferometers, modulators, and PICs, these solutions deliver low insertion loss and high PER for demanding photonic applications.
For more details on these polarization-maintaining solutions, visit SYLEX's website.
Edmund Optics offers a wide selection of polarization optics, including polarizers, waveplates, depolarizers, and polarizing beamsplitters. These components provide precise polarization control in laser systems, interferometry, and imaging setups, enhancing contrast, signal quality, and overall optical performance. Complementary polarization mounts are also available for secure and accurate component integration.
Perkins Precision Developments (PPD) specializes in providing custom, high energy polarization optics such as epoxy-free polarizing beam splitter cubes and thin film plate polarizers. Because we utilize ion beam sputtering (IBS) coating technology, our Brewster’s angle polarizers and 45 degree dielectric plate polarizers are environmentally stable, with no spectral shift caused by either time, moisture or temperature. The predictability and repeatability of IBS thin film coatings allow us to guarantee high transmission at a specific angle of incidence, eliminating the need to angle tune the optical component in order to achieve optimal performance.
As with all of our custom laser optics and polarizers, PPD's polarizing beam splitter cubes exhibit high extinction (Tp/Ts) and high damage thresholds, making them ideal for use with high energy Nd:YAG and fiber lasers, as well as other high-power pulsed and CW lasers used in directed energy research, space-qualified satellite systems and industrial materials processing.
Key features of PPD's polarizer cubes and plate polarizers include:
- Low absorption and high damage thresholds (> 20 J/cm2) — ideal for high energy pulsed Nd:YAG lasers, fiber lasers and other CW laser systems
- Space-flight qualified
- Durable, stable and epoxy-free
- Fully manufactured and coated at our ITAR-compliant Colorado facility
See also our white paper on High Power Polarizers!
OPTOMAN’s polarization optics are engineered for precise and stable control of light polarization in high-power and ultrafast laser systems. Explore high-power thin-film polarizers that efficiently separate s- and p-polarized light with high extinction ratios and minimal absorption, zero-order air-spaced IBS-coated waveplates that maintain phase accuracy and stability across different temperatures and wavelengths, and high-power optically contacted polarizing cube beamsplitters that enable robust, alignment-friendly laser beam splitting or combining.
Browse our in-stock polarization optics in OPTOSHOP.
ORISANDO® offers polarization converters which maintains exceptional stability and an ultra-high damage threshold, making it ideal for industrial and scientific application.
S-Waveplate converts linear polarization to radial or azimuthal polarization and circular polarization to an optical vortex.
Main features:
- Converts linear polarization to radial or azimuthal polarization
- Converts circular polarization to an optical vortex
- High 94% transmission at 1030 nm (no AR coating)
- Stand-alone — no additional optical elements needed
- High damage threshold: 63,4 J/cm² at 1064 nm, 10 ns and 2,2 J/cm² at 1030 nm, 212 fs
- Suitable for high LIDT applications and high-power lasers
- Reliable and resistant surface — the structure is inside the bulk
Additional waveplate assortment:
- Higher Order S-Waveplate: converts linear polarization to higher-order polarization patterns
- Custom Waveplate: enable patterned polarization control at the specific point of the laser beam
ORISANDO® is a new brand for space-variant retarders, developed by WOP | Workshop of Photonics® in 2025.
We offer a wide range of polarizers and other polarization optics for many different uses. Choosing the right polarization optic for your application can be a bewildering task, as we offer a wide range for many different uses.
A brief tutorial is available on our website.
Feel free to contact us for assistance. Our experienced staff is only too pleased to help you with the decision process.
DIAMOND provides high quality solutions for polarization-sensitive devices based upon polarization maintaining (PM) and polarizing (PZ) fibers to optimally control the polarization state of the signal. Low Insertion Losses (IL) combined with high Polarization Extinction Ratios (PER) and higher Return Losses (RL) are achieved over very broad spectral ranges through a combination of precise optical and mechanical design.