North American Laser Equipment Manufacturer - ZnSe CO2 Laser Windows | Customer Success Story
Project Type: Custom CVD ZnSe CO₂ Laser Protective Windows Client: North American Laser Equipment Manufacturer (Confidential) Initial Order: 1,200 pieces Outcome: Three consecutive repeat orders, annual strategic partnership established In mid-2024, a professional North American manufacturer of CO₂ laser engraving and cutting machinery approached Felix Glass Co., Limited with a recurring supply chain challenge. The company required high-precision CVD ZnSe laser windows with consistent 10.6 μm anti-reflection coating, full optical inspection documentation, and reliable delivery schedules — requirements their incumbent suppliers had failed to meet consistently. Following sample evaluation, on-machine laser testing, and an initial production order of 1,200 pieces, the client confirmed stable transmittance performance and low thermal absorption under operational conditions. The project has since expanded into three consecutive repeat orders, establishing Felix Glass Co., Limited as the client's preferred annual strategic partner for ZnSe optical components. The client is an established US-based OEM specializing in CO₂ laser systems for industrial engraving, cutting, and materials processing. Their equipment operates at the 10.6 μm wavelength, a spectral region where CVD-grown zinc selenide (ZnSe) is the preferred optical window material due to its broad transmission range, low absorption coefficient, and mechanical durability. As a manufacturer serving industrial end-users across North America, the client's business depends on three critical supply chain factors: optical coating consistency batch to batch, predictable production yields at their assembly stations, and on-time component deliveries that align with their own manufacturing schedules. Each of these factors had been compromised under their previous supplier relationships. The client identified three specific deficiencies in their existing ZnSe laser window supply chain: The 10.6 μm AR coating thickness and uniformity varied between production batches, causing inconsistent transmission rates that required additional incoming inspection and occasional component rejection at the client's facility. Incoming ZnSe windows from previous suppliers exhibited surface defects, coating pinholes, and dimensional deviations that reduced first-pass assembly yield and increased rework costs. Delivery schedules from previous suppliers were frequently extended without advance notice, disrupting the client's production planning and creating downstream delivery risks for their own customers. Previous suppliers provided minimal inspection data, making it difficult for the client to trace performance issues or validate optical specifications without conducting their own full metrology. After reviewing the client's engineering drawings and application parameters, Felix Glass Co., Limited confirmed the following technical requirements for the custom ZnSe CO₂ laser window order: Felix Glass Co., Limited approached this project with a structured engineering workflow designed to address each of the client's documented pain points. Rather than offering a generic catalog solution, our technical team conducted a thorough drawing evaluation before proposing a tailored manufacturing and quality plan. Upon receiving the client's inquiry, our optical engineering team performed a complete drawing review within 24 hours, cross-referencing the specified dimensions, coating requirements, and surface quality standards against our in-house CVD ZnSe substrate inventory and coating chamber calibration data. A detailed quotation was delivered within the same 24-hour window, accompanied by a technical proposal outlining substrate selection criteria, coating deposition parameters, metrology equipment to be used, and the full inspection documentation package the client would receive with each shipment. Sample ZnSe windows were produced using the confirmed specifications and shipped to the client's facility for on-machine laser testing. The samples were accompanied by preliminary transmission spectra and surface quality reports. The client conducted operational testing on their CO₂ laser systems, measuring actual transmission stability, thermal absorption characteristics, and beam quality. After confirming that all parameters met or exceeded their specifications, the initial mass production order of 1,200 pieces was placed. The anti-reflection coating applied to the ZnSe substrates is the single most critical factor determining laser window performance. At the 10.6 μm CO₂ laser wavelength, uncoated CVD ZnSe exhibits approximately 17% reflection loss per surface due to its relatively high refractive index (n ≈ 2.4). A properly designed and executed dual-side AR coating reduces this combined reflection loss to below 1%, directly improving laser system efficiency and protecting upstream optics from back-reflected energy. Felix Glass Co., Limited employs electron-beam physical vapor deposition (EB-PVD) coating technology with in-situ optical monitoring for the 10.6 μm AR coating process. Each coating run is calibrated against reference samples, and individual component transmission spectra are recorded using FTIR spectrometry as part of the standard quality documentation package. This approach ensures that the client receives actionable optical performance data — not just a pass/fail statement — with every shipment. Performance Verification: On-machine laser testing by the client confirmed stable transmittance and low thermal absorption across the full production batch, meeting all specifications for continuous industrial laser operation at 10.6 μm. A distinguishing feature of this project was the comprehensive inspection documentation delivered with each production batch. The client had previously experienced frustration with suppliers who provided minimal or inconsistent quality data, requiring the client to absorb the cost and time of re-inspection. Felix Glass Co., Limited's standard quality documentation package for this project includes: The initial production batch of 1,200 CVD ZnSe laser protective windows was delivered on schedule with complete inspection documentation. The client's incoming quality check confirmed that all components met the agreed specifications, and the on-machine performance validated the coating uniformity and optical transmission that had been demonstrated during the sample phase. Disclaimer: All project data reflects the performance within this specific OEM application. Actual service results depend on laser power, operating atmosphere, assembly design and maintenance conditions. 1,200 pieces CVD ZnSe laser protective windows with dual-side 10.6 μm AR coating and full optical inspection documentation delivered on schedule. 3 consecutive Following stable performance verification, the client placed three repeat orders and designated Felix Glass Co., Limited as their annual strategic partner for ZnSe optical components. "Stable coating uniformity, complete test reports, and consistent delivery schedules." This direct feedback from the client highlights the three dimensions that most strongly influenced their decision to transition from previous suppliers and establish a long-term partnership: coating reliability, documentation transparency, and delivery dependability. The client has since expanded their purchasing relationship with Felix Glass Co., Limited beyond the initial ZnSe laser window order and now considers us a qualified supplier for additional optical component categories within their CO₂ laser system product lines. Learn more about our full capabilities on the products page. This project illustrates several structural advantages that Felix Glass Co., Limited brings to OEM optical component procurement: With nearly two decades of focused optical glass manufacturing under a Japanese management system, we have supported over 2,000 companies in transitioning from prototype to mass production. Learn more about our company. Every shipment includes material certificates, coating transmission spectra, surface quality reports, and dimensional conformance data — eliminating the need for redundant incoming inspection at the client site. CNC machining, precision grinding, optical polishing, vacuum coating (AR, AF, AG, IR), tempering, and screen printing are all performed within our own facility — providing full process control from raw material to finished component. ISO 9001 quality management, RoHS compliance, and CE certification underpin every production order. We maintain a 100% on-time delivery target with full inspection reporting as standard practice. Beyond CVD ZnSe laser windows, Felix Glass Co., Limited offers a comprehensive range of precision optical components and materials for industrial laser systems and adjacent applications. Explore the following resources for more information: This ZnSe laser window project is one of many successful OEM partnerships at Felix Glass Co., Limited. Browse additional customer projects across laser, medical, aerospace, and industrial sectors: Start Your Project If you are sourcing precision ZnSe laser windows or other custom optical components, our engineering team is available to review your specifications and provide a formal quotation. Send an inquiry or contact us to begin.CVD ZnSe CO₂ Laser Protective Windows Case Study – North American Laser OEM Project
1. Project Snapshot
2. Client Background
3. The Procurement Challenge
Coating Quality Variability
Unstable Production Yield
Lead Time Uncertainty
Incomplete Documentation
4. Technical Specifications
Parameter
Specification
Notes
Material
CVD Zinc Selenide (ZnSe)
Chemical vapor deposition grade
Spectral Range
0.6 – 16.0 μm transmission
Broad IR transmission window
Target Wavelength
10.6 μm (CO₂ laser)
Primary operational wavelength
AR Coating
Anti-reflection at 10.6 μm
Dual-side coating applied
Transmission Target
≥ 99% at 10.6 μm (coated)
Verified per-piece with report
Surface Quality
40-20 scratch-dig per MIL-PRF-13830B
Laser-grade optical finish
Dimensional Tolerance
±0.05 mm
Diameter and thickness
Documentation
Full optical inspection report per batch
Coating curve, transmission data
5. Felix Glass Solution Approach
Engineering Drawing Review and Optical Parameter Confirmation
Formal Quotation With Technical Proposal
Pre-Production Sample Delivery
On-Machine Validation and Mass Production Qualification
6. Coating Technology and Optical Performance
7. Quality Assurance and Inspection Documentation
8. Collaboration Timeline
Phase
Activity
Timeline
Initial Contact
Client landed via Google search, downloaded ZnSe datasheet, submitted inquiry
Day 0
Technical Review
Drawing evaluation, optical parameter confirmation, formal quotation delivered
Within 24 hours
Sample Production
Pre-production samples manufactured with full documentation
3–7 business days
Client Testing
On-machine CO₂ laser testing, transmittance and thermal absorption verification
Client-managed
Mass Production
Initial batch: 1,200 pieces ZnSe laser windows with full inspection
15–25 business days
Repeat Orders
Three consecutive follow-on orders placed after performance verification
Ongoing
9. Production Results and Deliverables
Initial Order
Repeat Orders
10. Client Feedback
11. Why Felix Glass Co., Limited
19 Years of Precision Optics Experience
Complete Documentation Package
In-House Coating and Processing
Certified Quality Systems
12. Related Capabilities
13. Frequently Asked Questions
14. Explore More Case Studies
