Clean optics, reliable performance: SVS standards for laser protection windows
Laser protection windows are made of heat-resistant quartz or borosilicate glass and are designed to withstand thermal loads up to 500°C as well as mechanical stress. Both surfaces feature anti-reflective coatings precisely matched to the laser wavelength. The edges are faceted and polished to ensure secure, stress-free mounting. They are mounted in holding frames or cartridges with a sealing system, suitable for modular optical heads.
Available in standard and customized designs based on your drawings or samples. We tailor geometry, coatings, and materials to your laser source, optics head, and specific process requirements. For chemically demanding environments, versions made of particularly resistant materials, special coatings, or with additional surface hardening are available.
Catalog
Catalog of standard configuration
| 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 specification of SVS laser protection windows
- Standard substrate: Fused Silica (for high-power lasers)
- Standard tolerances: ر0,1mm or +0/-2,0mm
- Thickness: ±0,1mm or +0/-0,2mm
- Edges grinded with facette (e.g. 0,3mm x 45°)
- Both sides 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%
- Smudge-proof and scratch-resistant, adhesive peeling test, cleaning with alcohol mixture in a dust-free chamber, ultrasonic cleaning
Material Options
Material options
High transmission across relevant laser wavelengths (e.g., 1030–1080 nm). Withstands temperatures up to 500 °C and offers high chemical resistance. The standard for high-performance laser welding.
A more cost-effective alternative for moderate power ranges. Temperature-resistant up to approximately 300°C, suitable for less critical applications or processes with lower thermal stress.
Extremely scratch-resistant and highly durable against mechanical influences. Temperature-resistant up to over 1000°C and insensitive to abrasive particles. Recommended for high-performance applications with high particle loads or a high risk of wear.
Versions
Versions
The standard version for most laser welding heads. Easily installed in cartridges or holders for centered alignment in the beam path.
Used in specialized optics or large-format applications, such as combined cutting and welding systems. Protects larger fields and complex optics.
Coating options
Coating options
Optimized for a fixed wavelength, typically 1064 nm for fiber lasers. Reduces reflections to below 0.2% for minimum power loss and backreflection.
Designed for tunable or multi-line laser sources, e.g., 900–1080 nm. Ensures high transmission across a wide spectral range to prevent power loss under changing operating parameters.
For systems using multiple wavelengths or hybrid processes like cutting and welding. Coating systems are designed to suppress reflections at all relevant wavelengths.
Customized Request
Make a customized request
We offer laser protection windows in a wide range of dimensions, materials, shapes, and coatings. Tell us your requirements, and we'll provide you with tailored solutions.
Upload your technical drawing – we develop the perfect solution for your production line.
What lies behind consistent manufacturing quality
All components are manufactured in Germany and can be precisely tailored to your application. Standard versions are immediately available, ensuring short delivery times.
Manufactured with tight tolerances on high-performance machines with stable clamping systems and consistent tool settings to prevent dimensional deviations across series.
Consistently machined contact surfaces with low roughness reduce contact resistance and promote even current distribution across the weld zone.
All electrodes undergo quality-assured testing. For demanding use cases, we offer individual testing according to defined specifications.
We offer bespoke designs based on your technical specifications. Geometry and material are co-developed with your team to meet your production requirements.
Decades of experience shape every SVS product and contribute to the development of technical standards as an active member of the German Welding Association (DSV).
SVS Performance Features
For over 60 years, we have been a reliable partner in welding technology for manufacturers worldwide.
Applications
The function of laser protecting windows in the welding process
Anti-reflective protection windows are used in laser-based manufacturing processes such as cutting, welding, or surface structuring to protect sensitive and high-value optical components (especially focusing lenses and collimating optics) from contamination by splashes, vapors, or particles from the machining process.
Laser welding uses a focused laser beam to melt workpieces at a precise location and join them together. To ensure the beam accurately hits the joining zone, it is bundled and focused by optics in the welding head. The protective glass sits directly in front of these components and forms a barrier between the optics and the process zone. It intercepts particles, prevents deposits on the lenses, and thus ensures beam quality and the focal point.
Quality-relevant features of laser protection windows
High transmission (> 99%) with minimal reflection is essential. AR coatings must be precisely matched to the laser’s wavelength to avoid power loss and back reflections.
The glass must withstand high process temperatures without clouding or deforming. Heat-resistant materials such as quartz glass or sapphire glass are used for high-performance applications.
Process gases and welding fumes can be corrosive. Glass with high chemical resistance and smooth surfaces facilitate cleaning and extend service life.
Uniform AR coatings and polished surfaces prevent performance losses. Defects like scratches or coating flaws increase the degree of reflection and promote particle adhesion.
The geometry of the protective glass must be precisely matched to the optical head. Deviations can change the focal point or create stress in the glass.
Protective windows are wear parts. A design that can be easily removed and replaced reduces downtime and simplifies maintenance.
Advantages in laser applications
- Reliable protection of the primary optics prevents costly lens repairs
- Coating quality ensures consistent transmission throughout the entire operating period
- Longer optics service life reduces downtime and maintenance costs
- Quick replacement of the protection windows with consistent beam position
- Thermal stability prevents process deviations at high laser powers
- No loss of performance or focus deviations due to deposits in the beam path
Our experts will be happy to assist you in selecting and adapting the product to your specific setup.
Kai Kleinevoß
Head of Sales Wirbalit®
kleinevoss@svs-schweisstechnik.de
+49 208 99 328 15
You don't know the exact specifications of your current laser protection windows?
To determine the exact performance parameters of your laser, we offer a transmission measurement in cooperation with the LZH, Laser Center Hannover e.V. Please contact us for more information.
The laser protection windows is designed as a wear part and should be visually inspected regularly and replaced if it becomes cloudy, sticky, or damaged. Only use lint-free cloths and cleaning agents approved for optics. Contamination of the surface can lead to local overheating and ultimately to the destruction of the glass or downstream optics.