Laser Protection Window: 1064nm High Damage Threshold Fused Silica
Laser cutting, welding, and marking machines require high-stability protective windows to isolate dust, spatter, and smoke while maintaining ultra-high laser transmittance and anti-burn performance. Low-quality windows cause power loss, thermal deformation, and sudden laser damage. This page provides engineer-level laser window material comparison and selection rules for industrial laser equipment.
1. Laser Window Material Overview
Fused Silica Laser Protection Window has ultra-high laser damage threshold, low thermal expansion, and stable 1064nm laser transmission. It is the industry standard material for fiber laser protective windows.
Sapphire Laser Window has high hardness but lower laser damage threshold than fused silica, suitable for special anti-wear laser equipment rather than continuous high-power fiber laser operation.
2. Performance Comparison Table
| Parameter | Fused Silica | Sapphire | Engineering Recommendation |
|---|---|---|---|
| 1064nm Laser Damage Threshold | Extremely High | High | Fused silica for fiber laser |
| Thermal Shock Resistance | Excellent | Good | Fused silica for long working hours |
| Laser Transmittance | Ultra-high | High | Fused silica ensures laser power output |
| Surface Hardness | Medium | Very High | Sapphire for anti-scratch non-laser core area |
| Cost & Mass Production | Cost-effective | High cost | Fused silica for batch replacement |
3. Material Selection Guide (Quick Decision Table)
| Laser Equipment Requirement | Best Material |
|---|---|
| 1064nm fiber laser cutting/welding/marking machine | Fused Silica |
| High-power continuous laser operation | Fused Silica |
| CO2 laser (10.6μm) protection window | ZnSe / Fused Silica |
| Laser equipment anti-scratch outer protection | Sapphire |
4. Technical Specifications
| Specification | Standard Range | Custom Available |
|---|---|---|
| Diameter | 10mm – 80mm (common: 20/25/27.9/30/37/50mm) | Yes, per drawing |
| Thickness | 1mm – 5mm (common: 1.5/2/3/4mm) | Yes |
| Surface Quality | 20/10 to 10/5 (laser grade) | Ultra-precision available |
| Flatness | λ/4 to λ/10 @ 633nm | Yes |
| Parallelism | <30 arcsec to <5 arcsec | Yes |
| Laser Damage Threshold | >15 J/cm² @ 1064nm, 10ns | High-power grade coating |
5. Application Scenarios
- Fiber laser cutting machine protective windows
- Laser welding and laser marking machine lens shields
- Industrial high-power laser emitter protection glass
- Continuous working laser equipment dust-proof optical windows
- Laser cleaning and laser cladding equipment
6. Coating Solution
| Coating Type | Wavelength | Feature | Application |
|---|---|---|---|
| 1064nm Single-band AR | 1064nm | <0.2% reflectance, high LDT | Standard fiber laser protection |
| High-power Enhanced AR | 1064nm | >20 J/cm² damage threshold | High-power continuous laser |
| Anti-spatter / Anti-fouling | 1064nm + top coat | Easy cleaning, spatter resistance | Heavy dust / spatter environment |
| Dual-side AR | 1064nm both surfaces | >99.5% total transmittance | Max laser power output |
7. FAQ
Q: Why must laser windows use fused silica?
A: Fused silica has the highest laser damage threshold for 1064nm fiber lasers, avoiding burst damage during long-time high-power operation. It also offers excellent thermal shock resistance for continuous working conditions.
Q: Can sapphire replace fused silica for laser windows?
A: Not recommended for core laser optical paths due to lower laser damage resistance. Sapphire is only suitable for outer anti-scratch protection or low-power laser applications.
Q: What is the typical lead time for laser protection windows?
A: Standard sizes (20/25/27.9/30/37/50mm): 5–7 business days. Custom dimensions with special coating: 10–15 business days.
Q: Do you provide bulk pricing for replacement windows?
A: Yes. Laser protection windows are consumable parts; we offer tiered bulk pricing for regular replacement orders. Contact us for a volume quote.
8. Custom Manufacturing & Request a Quote
Hong Kong Felix Optical Glass Co., Limited supplies laser-grade fused silica protective windows in all standard sizes and custom dimensions, with professional laser AR coating for all industrial fiber laser equipment.
Available custom capabilities:
- Custom diameter and thickness matching any laser head model
- Laser-grade surface quality (20/10 to 10/5) and high-precision flatness
- 1064nm high-damage-threshold AR coating, anti-spatter enhanced coating
- Bulk production for consumable replacement with competitive pricing
Email: james@felixglass.com | Tel: +86 185 6503 2888
- What is the minimum order quantity for custom precision optical glass components?
FELIX OPTICAL GLASS offers highly flexible MOQs to support customer projects, including prototype testing, small-batch trial orders, and high-volume production. All products can be fully customized to your drawings, tolerances, and application standards. Please send us your specifications, and we will reply within 1-5 hours and provide an accurate quotation after careful evaluation within 1-2 days.
- Can I get free glass samples for testing before bulk order?
Yes, our FELIX GLASS factory supports sample testing for a wide range of precision optical glass components and assemblies. The lead time for sample production is 3 to 7 working days. Please contact us today to arrange samples and obtain a customized solution that meets your needs.
- What is the production lead time for custom optical glass components?
A: The production cycle for standard samples is 3-10 working days, while mass production requires 15-35 working days, depending on the complexity of the product and the order quantity. We provide reliable precision optical glass components and fast delivery services for orders from industries such as defense, industrial equipment, medical devices, shipbuilding, robotics, automotive, and aerospace. Please submit your project details so we can provide you with an accurate delivery schedule.
- Are your optical glass products ISO, CE and RoHS certified?
All precision optical glass components from FELIX OPTICAL GLASS comply with ISO quality system standards as well as CE and RoHS requirements. We provide comprehensive test reports, spectral graphs, material certificates, and inspection documents for customer review. Please feel free to request complete certification details and a formal quotation at any time.
- Do you offer one-stop custom optical glass processing services?
Yes. We offer a full range of precision optical glass component processing services, including CNC machining, precision grinding, optical polishing, chemical/physical tempering, vacuum coating (AR anti-reflective coating, AF anti-fingerprint coating, AG anti-glare coating, IR infrared coating), and screen printing. From raw materials to finished products, every step is completed in our own factory. Please tell us your needs, and we will provide you with the most cost-effective solution.
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