Clean Optics, Strong Beam: SVS Standards for Laser Protection Windows
Laser protection windows reliably shield focusing and collimation optics from spatter, particles and process vapors. They withstand temperatures up to 500 °C and resist significant mechanical stress.
Double-sided anti-reflective coatings, matched to the specific laser wavelength, provide over 99% transmission and keep reflections below 0.2%. For fiber lasers, the typical wavelength is 1064 nm. This minimizes power loss and protects optics from back reflections. Polished, chamfered edges allow for stress-free mounting in holders or cartridges and ensure stable performance in modular optics systems. For applications involving abrasive media or aggressive environments, versions with hardened or chemically resistant materials are available.
Available in standard sizes or custom-made based on your drawings or samples. Geometry, material and coating are precisely matched to your requirements.
Catalog
Standard Configurations
Exemplary Materials
Fused Silica, Borosilicate Glass and Sapphire Glass
| Glass diameter (mm) | Glass thickness (mm) | Optimized for wavelength range (nm) | Action |
|---|---|---|---|
19 | 3,0 | 900-1100, 650 & 785 | |
26,8 | 2,0 | 1064/1070, 633 | |
27 | 2,0 | 1064/1070, 633 | |
27 | 2,0 | 900-1100, 650 & 785 | |
30 | 1,5 | 900-1080, 630-650 | |
30 | 1,6 | 900-1100, 650 & 785 | |
38 | 2,0 | 1064/1070, 450-650 | |
38 | 3,0 | 1064/1070, 450-650 | |
39 | 2,0 | 1070 | |
50 | 1,5 | 1064/1070, 633 | |
50 | 2,0 | 900-1100, 650 & 785 | |
50 | 2,0 | 1064/1070 | |
50 | 3,0 | 1030-1090, 630 | |
50 | 3,0 | 900-1100, 650 & 785 | |
55 | 1,5 | 900-1090, 635 | |
55 | 1,5 | 1064/1070, 633 | |
55 | 1,5 | uncoated | |
60 | 3,0 | 1064/1070, 450-650 | |
21,5 | 2,0 | 900-1080, 630-650 | |
22,35 | 4,0 | 900-1080, 630-650 | |
24 | 5,0 | 1030-1090, 650 | |
25,4 | 1,5 | 900-1080, 630-650 | |
25,4 | 4,0 | 900-1080, 630-650 | |
25,4 | 5,0 | 900-1080, 630-650 | |
25,4 | 5,0 | 900-1080, 630-650 | |
27,9 | 4,1 | 900-1080, 630-650 | |
30 | 1,5 | 900-1080, 630-650 | |
30 | 5,0 | 900-1080, 630-650 | |
32 | 6,35 | 1025-1080 | |
33,3×33,3 (Octagonal) | 1,5 | 900-1080, 630-650 | |
34 | 5,0 | 1030-1070, 650-670 | |
35 | 1,5 | 900-1080, 630-350 | |
35 | 5,0 | 900-1080, 630-650 | |
37 | 7,0 | 900-1080, 630-650 | |
38,1 | 5,0 | 900-1080, 630-650 | |
55 | 1,5 | 1025-1080 | |
50 | 1,5 | 900-1080, 630-650 | |
95,8 | 3,0 | 1025-1080 | |
96 | 3,0 | 1030-1090, 800-820 | |
134 | 3,0 | 1030-1090, 800-820 | |
134 | 3,0 | 1030-1090, 650 | |
140 | 4,0 | 1030-1090, 650 |
Standard Specifications:
- Standard substrate: Fused Silica (for high-power lasers)
- Standard tolerances: ر0,1mm or +0/-2,0mm
- Thickness tolerance: ±0,1mm or +0/-0,2mm
- Edge finish: Ground with chamfer (e.g. 0,3mm x 45°)
- Surface quality: Double-sided mechanically polished λ/4-λ/6
- Scratch/dig: 60/40 or 40/20
- Standard coating: @1064nm T≥99,6% & @633nm T≥95% or
- Broadband coating: e.g. @900–1080nm T≥99,5%
- Cleaning and durability: Wipe- and scratch-resistant, Tesa tape test, cleaned with alcohol-based solution in a dust-free chamber, ultrasonic cleaning
Options
Material Selection
Fused silica transmits laser light between 1030 and 1080 nm with minimal loss. It combines thermal stability with chemical resistance and is preferred when beam quality and process reliability are critical. Continuous use is possible up to 500 °C. Short-term peaks are tolerated at much higher levels.
Borosilicate is a cost-efficient option for applications with moderate laser power. It withstands temperatures up to approximately 300 °C and is suitable for processes with low thermal and mechanical stress.
Sapphire glass is highly scratch-resistant and withstands temperatures above 1000 °C. It is used in environments with high particle exposure, abrasive media or mechanical wear. Typical applications include high-power laser systems.
Options
Coating Options
Designed for a specific laser wavelength, typically 1064 nm in fiber laser systems. Reflectance is reduced to below 0.2 %, minimizing power loss and back reflection.
Suitable for laser sources with variable spectra or multiple lines between 900 and 1080 nm. Ensures high transmission across a wide wavelength range and prevents losses under changing operating conditions.
Used in systems with different laser wavelengths or combined processes such as cutting and welding. The coating suppresses reflection across the full working spectrum.
Versions
Available Shapes
Round shapes are the standard for most laser welding heads. They are installed in cartridges or retaining rings and maintain a centered beam path.
Designed for larger optics or multifunctional systems. Rectangular windows protect extended fields and complex optical setups, often found in combined laser cutting and welding heads. Fitted holders keep them in exact position.
Catalog
Send an Inquiry
We offer laser protection windows in a wide range of dimensions, materials, shapes and coatings. Use the form to tell us about your requirements. Our experts will get back to you promptly with a suitable solution.
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All components are manufactured in Germany and precisely matched to your application. Standard designs are available from stock, ensuring short delivery times and maximum flexibility.
Tight tolerances, stable production equipment, and consistent clamping conditions ensure reliable dimensional accuracy and repeatable results across all production runs.
Our products are subject to strict quality inspections. For special requirements, individual tests are carried out according to defined specifications.
Flexibility is our strength. Our products are available in numerous variants and can be manufactured with high precision to fit your system requirements.
For decades, we have contributed our expertise to SVS products and, as an active member of the German Welding Society (DVS), have helped shape technical standards.
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For over 60 years, we have been a reliable partner for manufacturers worldwide in welding technology.
Fundamentals
Function of Protective Windows in Laser Welding
Anti-reflective protective windows are key components in laser-based processes such as cutting, welding and structuring. They shield sensitive optics, including focusing and collimation lenses, from spatter, fumes and particles generated in the process zone.
In laser welding, the laser beam is collimated and focused to create a metallurgical joint at a defined location. The protective window is positioned directly in front of the optics inside the welding head, forming a transparent barrier between the process and the optical components. This prevents contamination of the lenses, maintains beam quality and ensures an accurate focal point.
Key Parameters of Laser Protection Windows
Transmission defines how much laser energy reaches the material. A drop in transmission reduces energy density at the focal point, impairing weld quality and process stability. Consistently high transmission is essential for reproducible results.
During operation, protective windows are exposed to high temperatures. The material must withstand this thermal load without deformation or loss of optical properties. Thermal stability maintains transmission and extends service life.
Process gases and welding fumes can be corrosive. Glass with high chemical resistance and smooth surfaces facilitate cleaning and extend service life.
Anti-reflective coatings increase transmission and reduce reflection. A polished surface minimizes scattering and prevents particle build-up. Scratches or defects raise resistance, attract deposits and shorten the lifespan.
The geometry must match the optics mount precisely. Deviations can shift the focal point or create stress within the glass. Precision fitting is key to protecting optics and keeping the process stable.
Laser protection windows are wear parts. Easy replacement reduces downtime and supports efficient maintenance.
Advantages in Laser Applications
- Reliable protection of the primary optics prevents costly lens repairs
- Consistent coating quality ensures stable transmission throughout the entire service life
- Extended optic lifetime reduces downtime and maintenance costs
- Quick replacement of the protection windows without changing beam position
- Thermal stability prevents process deviations at high laser power levels
- No loss of performance or focus due to deposits in the beam path
Our specialists support you in selecting and adapting the solution to your production.
Kai Kleinevoß
Head of Sales Wirbalit®
kleinevoss@svs-schweisstechnik.de
+49 208 99 328 15
Not sure about the specifications of your current protective window? We can help. In cooperation with Laser Zentrum Hannover (LZH), we offer transmission measurements to determine your system’s requirements. Get in touch for details.
Laser protection windows are designed as wear parts and should be inspected regularly. Cleaning should only be carried out using lint-free cloths and cleaning agents approved for optical components. Residue on the surface can lead to heat accumulation and damage both the window and downstream components. If clouding, deposits or damage are visible, replacement is necessary.