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| Categories | Custom Special Optical Lenses |
| Brand | FELIX GLASS optical glass Manufacturing base |
| Model | FG-bk7-12 |
| Material | Optical Grade N-BK7 (Schott Equivalent) |
| Component Types | Lenses, Beam Splitter Prisms, Right-Angle Prisms, Protective Windows |
| Coating | Visible AR 400-700nm, Single-Wavelength AR, Dual-Band AR |
| Surface Quality | 60-40 Standard, 40-20 or 20-10 on Request |
| Application | Fiber Laser Marking, Laser Engraving, Welding, Cleaning, Beam Delivery |
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N-BK7 optical glass provides a balanced combination of visible-spectrum transmission, refractive index uniformity, and practical machining cost for industrial fiber laser marking, engraving, and micro-machining optical systems. Felix Glass Co., Limited supplies drawing-based N-BK7 lenses, beam splitter prisms, and protective windows for US-based industrial laser equipment manufacturers, optical engineering teams, and system integrators who require repeatable optical performance across production quantities. For a broader view of BK7 optical capabilities, see the BK7 Optical Glass Components product line. These values describe typical customization directions for N-BK7 laser optical components. Final tolerances, inspection methods, and acceptance criteria should be confirmed on the approved drawing. N-BK7 provides a well-characterized refractive index of nd=1.51680 with melt-to-melt consistency that supports predictable focal length, beam diameter, and spot size across production batches of laser marking machines. With visible-band anti-reflection coating, N-BK7 optics achieve transmittance above 99% per surface in the 400-700 nm range, reducing power loss and stray reflections in fiber laser marker optical paths. N-BK7 is not a soft glass that degrades quickly under laser exposure. Its hardness supports CNC grinding and polishing routines that produce consistent surface figures at a cost structure suitable for serial OEM component supply. With a coefficient of thermal expansion of 7.1e-6/K, N-BK7 maintains dimensional and optical stability within the typical ambient-to-warm temperature range of industrial laser marking enclosures. Optical-grade N-BK7 raw material is selected for low inclusion and striae content, reducing scatter and absorption sites that could create hot spots under focused laser beams. Material certificates with melt data and refractive index measurement are available for projects that require documented traceability from raw glass to finished optical component. For material selection guidance, review the BK7 Optical Glass technical reference. Positive focal length lenses for focusing collimated fiber laser output to a precise marking spot. Available in standard and custom diameters from 10 mm to 150 mm with visible AR coating for 1064 nm frequency-doubled green laser markers and visible pilot beam systems. Negative lenses for beam expansion stages in galvanometer scanning heads. Tight center-thickness tolerance and low surface irregularity support consistent beam profile across the marking field. N-BK7 cube and plate beam splitters with partial-reflection coating for power monitoring, alignment, and dual-path optical configurations in industrial laser workstations. 90-degree beam deviation prisms with reflective hypotenuse coating for compact optical path folding in laser marking heads and beam delivery modules. Flat N-BK7 windows with AR coating serve as replaceable protective barriers between the laser source and the work area. Custom thickness, diameter, and edge chamfer matched to OEM housing design. Drawing-defined wedge prisms, cylindrical lenses, and irregular-profile optical components for proprietary laser system designs reviewed on a project basis. Additional application configurations are discussed in Industrial Laser Equipment Optical Solutions. Anti-reflection coating is applied to N-BK7 laser optics using vacuum deposition technology. The coating design is selected for the operating wavelength band of the target laser system. Multi-layer dielectric coating achieving reflectance below 0.5% per surface across the visible spectrum, suitable for green laser markers, visible alignment beams, and multi-wavelength inspection systems. Optimized for one specific laser wavelength such as 532 nm, 633 nm, or 1064 nm, achieving minimum reflectance at the design wavelength for maximum throughput. AR coating designed for two distinct wavelength regions, commonly 532 nm for green marking and 1064 nm for infrared pilot or measurement channels. Standard AR coatings pass adhesion, abrasion, and humidity tests per MIL-PRF-13830B or ISO 9211. Hard-coated options are available for optics exposed to frequent cleaning or handling. Coating selection guidance is also covered in the Precision Instrument Calibration Optics resource. Felix Glass follows a structured production and quality control workflow for N-BK7 laser optical components, from raw material verification through finished part inspection. N-BK7 focusing lenses, protective windows, and beam splitter optics for desktop and gantry-type fiber laser marking and engraving systems used in metal, plastic, and ceramic part identification. Visible AR-coated N-BK7 optics for frequency-doubled green laser markers used in silicon wafer marking, glass engraving, and reflective metal surface processing. N-BK7 beam steering and protective window components for CO2 laser optical paths, with coating selected for the 10.6 um wavelength or visible alignment channel when combined with ZnSe optics. Protective windows and beam delivery optics for pulsed fiber laser cleaning systems, where replaceable N-BK7 windows protect internal galvo and focusing assemblies from debris and fume. N-BK7 protective glass and beam splitter optics for handheld and automated fiber laser welding heads operating in visible and near-infrared wavelength ranges. Each batch of N-BK7 laser optical components goes through a defined inspection sequence before release. The standard inspection plan can be adjusted to match customer-specific quality requirements. Transmission and reflection interferometry at 632.8 nm for measuring surface figure error, irregularity, and transmitted wavefront distortion. Coated optics are measured for transmission across the design wavelength range using a calibrated spectrophotometer, with spectral curves included in inspection reports when required. Calibrated digital micrometers, optical comparators, and CMM equipment measure diameter, center thickness, wedge angle, and parallelism per the drawing specification. Certificate of conformance, material certification, and dimensional inspection reports are available. ISO 9001 quality management system supports documentation requirements for international equipment purchasing. To provide an accurate feasibility review and project quotation, the following information helps the engineering team evaluate material, geometry, coating, and inspection requirements. 75000 sqm manufacturing facility with independent CNC optical grinding, precision polishing, vacuum coating, and metrology departments. Production capacity supports both prototype samples and serial OEM supply. Quality management processes follow ISO 9001 standards with documented incoming material inspection, in-process control, and final QC release procedures. Equipped with Zygo and 4D Technology interferometers, Agilent spectrophotometers, and calibrated dimensional measurement instruments for independent optical performance verification. Experience with FOB, CIF, and DDP shipping terms to US ports. Certificates of origin, packing lists, commercial invoices, and compliance documentation prepared for US customs clearance. Direct technical communication with optical engineers in English for drawing review, tolerance discussion, coating specification, and inspection planning without translation delay. Production process control and material lot management support consistent optical performance across repeat orders, which matters when the same N-BK7 optic is integrated into a serial-production laser marking machine. Company background and manufacturing details are available on the About Felix Glass page. Standard catalog includes plano-convex focusing lenses, plano-concave beam expander lenses, right-angle prisms, beam splitter prisms, and flat protective windows. Drawing-defined custom geometries can be reviewed for OEM projects. N-BK7 is suitable for the visible wavelength range and moderate-power near-infrared applications. For high-average-power or high-peak-power 1064 nm fiber laser transmission, fused silica may be recommended. Please provide the laser power, beam diameter, and operating wavelength for a material suitability review. Standard scratch-dig is 60-40. Upgraded specifications of 40-20 or 20-10 are available for optics in the beam waist region or where scatter control is important for marking contrast. Provide the operating wavelength, angle of incidence, polarization state if applicable, and the required transmission or reflectance value. The coating design is then selected from standard visible AR, single-wavelength AR, or dual-band AR options. Yes, prototype and small-batch orders are supported. Engineering review, material procurement, and process planning follow the same workflow for prototypes and production, so prototype results are representative of serial production capability. Felix Glass provides drawing-based N-BK7 optical component manufacturing for US-based industrial laser equipment builders and system integrators. Submit the optical drawing, quantity, coating specification, and inspection requirements through the inquiry form for an engineering feasibility review and project quotation.
Attention
N-BK7 Laser Optical Lenses and Prisms for Industrial Marking Equipment
Direct answer: Standard N-BK7 laser optics from Felix Glass include plano-convex and plano-concave lenses, right-angle and beam splitter prisms, and protective windows with visible-band AR coating. Custom diameter, center thickness, radius, surface quality, and coating specifications are reviewed against the customer drawing. Production routing covers CNC curve generation, precision polishing, vacuum coating, and interferometric inspection.
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N-BK7 Laser Optics Technical Specification Table
Parameter Typical Customizable Value Drawing Review Note Base material Schott N-BK7 or equivalent optical glass Refractive index nd=1.5168, Abbe number vd=64.17 at standard condition. Available component types Plano-convex, plano-concave, biconvex, biconcave, meniscus, right-angle, beam splitter prism, and flat window Custom shapes including cylindrical and wedge can be reviewed. Standard diameter range 3 mm to 300 mm for lenses; 5 mm to 200 mm for prisms and windows Larger sizes depend on thickness and handling feasibility. Surface quality Typical 60-40 scratch-dig; upgraded to 40-20 or 20-10 when specified Specify inspection standard and clear aperture on the drawing. Surface flatness lambda/4 at 632.8 nm standard; lambda/10 available for critical surfaces Confirm test wavelength and clear aperture. Coating options Visible AR coating (400-700 nm), single-wavelength AR, or broadband AR Provide target wavelength band, incidence angle, and transmission requirement. Dimensional tolerance Diameter +/-0.05 mm standard; thickness +/-0.05 mm standard Tighter tolerances reviewed against geometry and production routing. Edge processing Chamfer, bevel, blackened edge, or custom machining Include edge detail and datum references in the drawing. 
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Why N-BK7 for Industrial Laser Marking Optics
Uniform Refractive Index for Repeatable Beam Control
High Visible Transmittance Through AR Coating
Practical Machining Cost for OEM Production
Stable Thermal Performance Within Operating Range
Low Bubble and Inclusion Content
Certified Raw Material Traceability
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N-BK7 Component Types for Fiber Laser Marking Systems
Plano-Convex Focusing Lenses
Plano-Concave Beam Expander Lenses
Beam Splitter Prisms
Right-Angle Prisms
Laser Protective Windows
Custom Wedge and Special-Shape Optics
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Visible AR Coating for N-BK7 Laser Optics
Broadband Visible AR (400-700 nm)
Single-Wavelength AR Coating
Dual-Band AR Coating
Coating Durability
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CNC Manufacturing and Inspection Workflow for N-BK7 Laser Optics
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Industrial Laser Equipment Applications for N-BK7 Optics
Fiber Laser Marking Machines
Green Laser Markers (532 nm)
CO2 Laser Beam Delivery Modules
Laser Cleaning System Optics
Laser Welding Optical Modules
Desire
Inspection Standards and Quality Assurance for Laser Optics
Interferometric Surface Figure Testing
Spectrophotometric Transmission Measurement
Dimensional and Geometric Verification
Documentation and Certification
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Drawing Information Required for N-BK7 Laser Optics Quotation
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Why US Industrial Laser Manufacturers Choose Felix Glass for N-BK7 Optics
Dedicated Optical Manufacturing Infrastructure
ISO 9001 Certified Quality System
In-House Optical Metrology Laboratory
International Shipping and Documentation Support
English-Language Engineering Communication
Repeat Order Consistency
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Frequently Asked Questions About N-BK7 Laser Optics
What N-BK7 optical components does Felix Glass supply for laser marking machines?
Can N-BK7 lenses handle the power levels of industrial fiber lasers?
What surface quality is available for N-BK7 laser optics?
How is the AR coating specified for a laser marking application?
Can Felix Glass supply prototype quantities before committing to production volumes?
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We supply Industrial Glass, Sapphire Optics, Optical Lenses/Prisms/Filters, Infrared IR Optics, Functional & Display Glass, N-BK7/H-K9L Optical Glass, supporting OEM mass production and laboratory custom prototypes. Flexible MOQ & free sample service available. Fill in the form to download full datasheets and get factory wholesale price within 24 hours.
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.
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?
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.
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.
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.
