Wedge Windows for Precision Laser Applications

Sapphire Wedged Windows

Sapphire Wedged Windows

Request Quote
Sold by: CSOC Ships from: China
Specifications
Material: Custom, Sapphire, Chalcogenide Glass, BK7, UVFS, FS
Surface Flatness: Lambda/4
Surface Quality (Scratch-Dig): 10-5, 20-10, 40-20, 60-40
Wedge Angle: 3 arc minutes
Diameter: 5 mm
Sapphire Stepped Windows

Sapphire Stepped Windows

Request Quote
Sold by: CSOC Ships from: China
Specifications
Material: Custom, BK7, GaAs, Sapphire, UVFS, FS
Surface Flatness: Lambda/40, Lambda/20, Lambda/10, Lambda/8, Lambda/6, Lambda/4, Lambda/2, Lambda
Surface Quality (Scratch-Dig): 10-5, 20-10, 40-20, 60-40, 80-50
Diameter: 25 mm
Diameter: 1 mm to 200 mm+
Custom-Made Step and Wedge Windows | ARD Optics

Custom-Made Step and Wedge Windows | ARD Optics

Request Quote
Sold by: ARD-OPTICS Ships from: Armenia
Specifications
Material: Custom, BK7, GaAs, Sapphire, Chalcogenide Glass, Cleartran, Si, Ge, ZnS, ZnSe, BaF2, MgF2, IR Grade CaF2, CaF2, IR Grade FS, UVFS, FS
Surface Flatness: Other, Lambda/10, Lambda/8, Lambda/6, Lambda/4, Lambda/2, Lambda
Surface Quality (Scratch-Dig): 10-5, 20-10, 40-20, 60-40, 80-50
Wedge Angle: 1 arc minutes
Diameter: 1 mm

Did You Know?

Wedge windows are a simple yet powerful solution to a major problem in laser optics—unwanted back reflections. Unlike standard flat windows, wedge windows feature slightly angled surfaces that steer reflected beams away from the optical axis. This small design change prevents the formation of etalons—interference patterns caused by parallel surfaces—which can introduce noise, reduce system stability, and even damage sensitive laser components. In high-precision laser applications, even minor reflections can lead to mode hopping or instability in the laser cavity. Wedge windows eliminate this risk by ensuring that reflected light doesn’t travel back into the laser source. They're also frequently used in beam sampling setups, where a portion of the laser beam is intentionally redirected for monitoring or diagnostics without disrupting the main beam. Whether in scientific research, industrial processing, or medical systems, wedge windows offer a smart and efficient way to boost performance and protect your investment.

Related Resources

Frequently Asked Questions

A wedge window is an optical window whose two faces are intentionally non-parallel, forming a small wedge angle (typically a few arcminutes to a few degrees). Unlike a parallel window that can generate strong back-reflections and etalon effects, a wedge window deflects reflected beams out of the main optical path, reducing interference fringes and feedback into lasers or sensitive detectors.

Overview of Wedge Windows

Wedge Windows are optical windows manufactured with a small intentional wedge angle between their two surfaces. In laser and photonics systems, Wedge Windows are used to eliminate parasitic etalons, suppress back reflections into the laser cavity, and provide controlled beam deviation. Typical substrates include BK7, fused silica, CaF2, and other IR materials selected according to the operating wavelength.

Typical Specifications and Performance

Key parameters for Wedge Windows include clear aperture, substrate material, thickness, wedge angle, surface quality, and surface flatness. Standard wedge angles range from a few arcminutes to several degrees, depending on the required beam separation and reflection control. Surface quality is commonly specified as 20-10 to 40-20 scratch-dig for laser and imaging applications, with flatness on the order of λ/10 to λ/2 at a reference wavelength.

Coating options for Wedge Windows typically include broadband or narrowband anti-reflection (AR) coatings optimized for UV, visible, or IR bands, and sometimes high-reflection (HR) coatings on one surface for beam sampling. Damage threshold, transmission, and wavefront distortion are critical for high-power laser use. Buyers should review vendor-provided data on laser damage thresholds and spectral performance charts.

Applications of Wedge Windows

Wedge Windows are widely used in interferometers, beam sampling assemblies, ring-down cavities, and laser diagnostics where back-reflection control is essential. They are also implemented in seed laser isolation, beam steering, and ghost image suppression in imaging paths. In ultrafast and high-power lasers, carefully specified Wedge Windows help maintain beam quality while minimizing feedback into sensitive sources.

Buyer Guidance on FindLight

On FindLight you can compare Wedge Windows from multiple suppliers by substrate, wedge angle, wavelength range, and coating type. Evaluate specifications such as surface quality, flatness, clear aperture, and laser damage threshold against your system requirements. For custom wedge angles, sizes, or coatings, you can request detailed quotes directly from manufacturers. No registration is required to send inquiries, enabling rapid technical discussions and pricing clarification for your Wedge Windows selection.