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 your MOQ for custom optical glass and display glass parts?
Felix Glass offers highly flexible MOQ to support client projects, including prototype testing, small batch trial orders and large-volume mass production. All products can be fully customized according to your drawings, tolerances and application standards. Send us your specs to get an accurate price quote within 24 hours.
- 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?
What is the production lead time for custom optical glass components?
Answer: The lead time for standard samples is 3–7 business days, while mass production takes 15–25 business days, depending on product complexity and order volume. We provide reliable, rapid delivery for orders serving the industrial, medical, automotive, and aerospace sectors. Please submit your project details to receive an accurate delivery schedule.
- Are your optical glass products ISO, CE and RoHS certified?
All FELIX GLASS precision optical glass components comply with ISO quality system standards, as well as CE and RoHS requirements. We provide comprehensive test reports, material certificates, and inspection documentation for customer review. Please feel free to request full certification details and a formal quotation today.
- Do you offer one-stop custom optical glass processing services?
Yes. We provide a full range of in-house processing services, including CNC machining, precision grinding, optical polishing, vacuum coating (AR, AF, AG, IR), tempering, and screen printing. Every step—from raw material to finished product—is carried out within our own facility. Please let us know your requirements, and we will provide you with the most cost-effective solution.
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