Thin Film Polarizers for Laser and Imaging Systems

Thin Film Polarizer for Solid-State Lasers

Thin Film Polarizer for Solid-State Lasers

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Sold by: CRYSTECH Inc. Ships from: China
Specifications
Substrate Material: N-BK7, Fused Silica, UV-Grade Fused Silica (UVFS), Calcium Fluoride, Sapphire, Custom
Shape: Round, Square, Rectangle, Custom
Size (largest Dimension): 16 mm
Wavelength Range: 532 – 2094 nm
Surface Quality, S1 (scratch-dig): 10-5

Did You Know?

Did you know that a thin-film polarizing beamsplitter can achieve extinction ratios above 10,000:1 over tens of nanometers of bandwidth by exploiting angle- and wavelength-dependent constructive/destructive interference in a multilayer dielectric stack, rather than bulk birefringence? At the design Brewster-like angle (often 56–58° for glass substrates at 532 or 1064 nm), the p-polarized component can be transmitted with >98–99% efficiency while the s-polarized component is reflected with similarly high efficiency, but a few degrees of angular misalignment can easily cut the extinction ratio by an order of magnitude. A common misconception is that these devices are "achromatic"; in reality, layer thickness tolerances on the order of a few nanometers and the coherence length of the source strongly influence both spectral performance and laser damage threshold, especially in ultrafast systems.
Read more in our Blog

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Frequently Asked Questions

A thin film polarizer is an optical element that uses multilayer dielectric or metallic coatings on a substrate to transmit one linear polarization state while reflecting or attenuating the orthogonal state. It operates by polarization-dependent interference and Fresnel reflection at multiple interfaces, engineered so that the coating stack has high transmission for s- or p-polarized light and high reflectance or extinction for the other polarization over a target wavelength band and angle range.

Overview of Thin Film Polarizers

Thin Film Polarizers are dielectric-coated optical components designed to transmit one polarization state while reflecting or attenuating the orthogonal state. By using multilayer interference coatings on glass or crystalline substrates, these polarizers achieve polarization control with low absorption and high laser damage resistance across specific wavelength bands.

On FindLight, Thin Film Polarizers are available for use in free-space laser setups, imaging paths, and beam delivery systems where compact form factor and wavelength-specific performance are required.

Typical Specifications

When sourcing Thin Film Polarizers, engineers typically evaluate:

  • Wavelength range: Narrowband designs for specific laser lines (e.g., 355 nm, 532 nm, 1064 nm) or broadband versions for wider spectral coverage.
  • Polarization type: Separation or selection of s- and p-polarized light at a defined angle of incidence, commonly 45° or Brewster angles.
  • Extinction ratio: Tp/Ts or Rs/Rp values (e.g., >100:1 or >1000:1) indicating polarization purity.
  • Damage threshold: Maximum CW or pulsed laser power/fluence the Thin Film Polarizers can withstand without coating degradation.
  • Transmission and reflection: High transmission for the desired polarization and high reflection or attenuation for the orthogonal polarization.
  • Substrate and size: Fused silica, BK7, or other substrates in standard diameters or rectangular plates; surface quality and flatness suitable for precision beam shaping.

Use Cases

Thin Film Polarizers are used for beam splitting by polarization, power balancing in laser cavities, polarization-sensitive imaging, contrast enhancement, and isolation of a specific polarization state in metrology and spectroscopy systems. Their low absorption and high laser damage threshold make them suitable for high-power and ultrafast laser applications.

Buyer Guidance on FindLight

When comparing Thin Film Polarizers on FindLight, match the specified wavelength and angle of incidence to your optical layout, and verify extinction ratio and damage threshold against your laser parameters. Review coatings, clear aperture, and mounting format to ensure mechanical compatibility with existing optomechanics.

Procurement engineers and R&D teams can compare multiple Thin Film Polarizers side by side, then contact suppliers directly to clarify custom coating options, tolerances, or volume pricing. Request detailed quotes without registration, streamlining specification review and procurement of Thin Film Polarizers for your optical system.