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China, Chinese 38mm N-Bk7 Ar Coated Optical Spherical Double Concave Lens Negative Biconcave Lens1 Industrial Products Supplier Manufacturer Details, price list catalog:
China Industrial Products Supplier Manufacturer List Catalog
Optical Lens InstrumentOptical LensOptical LensBiconcave Lens
Band Optics Technology
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Product DescriptionSpecificationProduct:Optical Biconcave LensMaterials:Optical Grade Glass, N-BK7, UV fused silica, CaF2, ZnSe, ZnS, Ge, Si, Sapphire, etc.Diameter:1.5mm-550mmDiameter Tolerance:±0.05 mm (precision ±0.01mm)Thickness:0.5mm-100mmThickness Tolerance:±0.05mm (precision ±0.01mm)Focal Length Tolerance:±1 %Surface Quality:20-10 scratch-dig (up to 10-5 available)Flatness:PV<1/4L@ 633nm (up to 1/10L); RMS<1/40LSurface Roughness:Rq<0.5nmCentration:<3 arcmin (1 arcmin precision)Center:ETV<0.008mmChamfer:<0.1mmClear Aperture:≥90 % of DiameterAOI:0-55degCoatings:single-layer MgF2, broadband VIS, VIS-NIR, NIR I/II, telecom, or high-energy laser V-coatings (266nm, 355nm, 532nm, 1064nm, etc.)Key FeaturesOptical Biconcave LensDiverging Light RaysBi-concave lenses inherently diverge incident light. A parallel input beam appears to originate from a virtual focal point behind the lens, enabling beam expansion, focal-length adjustment, or uniform illumination. Negative Focal LengthSupplied with negative focal lengths (typical range –30 mm to –1000 mm), these lenses allow precise control over divergence angle and system back-focus. Custom focal lengths available on request. Coating OptionsUncoated: Economical choice for low-power or cost-sensitive setups.MgF2 Single-Layer: Reduces average reflection to ≈1.5 % per surface at 550 nm.Broadband AR: Multi-layer V-coating achieves <0.5 % reflection over 400–700 nm (other ranges available), maximizing throughput in imaging or spectroscopic systems. ApplicationsOptical Biconcave Lens1. Laser Beam Expansion & ShapingBi-concave lenses are widely used in laser systems to diverge and expand a collimated laser beam. By increasing the beam diameter, they help achieve the required beam size for downstream optics or applications like:Laser projection systemsMaterial processing (e.g., cutting or engraving)Beam shaping before re-collimation with a second lens Note: A bi-concave lens is often used in a Galilean or Keplerian beam expander setup, paired with a convex lens to re-collimate the expanded beam.2. Focal Length Adjustment & Convergence CorrectionIn optical assemblies such as telescopes, microscopes, or beam delivery systems, bi-concave lenses are used to:Increase the effective focal length of the systemCounteract excessive convergence from preceding opticsFine-tune the image plane location without redesigning the entire system This is especially useful in multi-element lens systems where precise control over ray divergence is needed. 3. Photography & Imaging SystemsWhile not common in standard camera lenses, bi-concave lenses are used in specialized imaging setups to:Create soft-focus effects or deliberate distortionWiden the field of view when used in combination with positive lensesCorrect for spherical aberrations or chromatic aberrations as part of a compound lens group They are also used in experimental optics, artistic photography, and custom lens prototyping.4. Educational & Demonstrative OpticsDue to their simple diverging behavior, bi-concave lenses are frequently used in:Optics labs to teach ray tracing and lens equationsDemonstrations of virtual image formationInspectionsProduction LineCompany HistoryFAQQ: What are your main products?A: Optical Components: Aspherical Lenses, Spherical Lenses, Cylindrial Lenses, Lens Assemblies, Optical Windows, Optical Mirrors, Optical Prisms, Optical Filters, and Other Special Shaped Optics...... Q: What's your MOQ?A: Normally one piece. If more, we can talk about discount. You can ship with other parts together .Q: How about the delivery time?A: For stocks, within one week after the payment. As to customized products, the delivery time will be negotiated according to your requirements. Q: Can i get a sample to check the quality?A: YES, we are glad to provide samples for your test. And there is discount for Trade Assurance Sample Order. Q: Can you offer OEM service?A: YES. We will custom the material, specifications and optical coatings for your optical components as your requirements. Q: How to pay?A: T/T, L/C, Western Union, Cash, Credit Card, Paypal, Alipay, MoneyGram, Assurance payment...... Q: What's the way of shipping?A: We accept DHL, Fedex, TNT, UPS, EMS, SF and etc. If you have your own express number, it's great. Q: How to guarantee the quality of your products? A: 1) Strict detection during each production process. 2) Advanced metrology solutions: ZYGO, Mitutoyo, Agilent, TAYLOR HOBSON, TRIOPTICS, MOELLER-WEDEL.....3) Strict inspection on products before shipment and intact product packaging ensured. Q: Any other good service your company can provide?A: 24-hour after-sale service and long-time maintenance......Accepted delivery terms: FOB, CIF, EXW, DDU, DDP, Express..... Accepted payment currencies: USD, EUR, RMB...... Accepted Languages: English, Japanese, Chinese, Spanish, Russian.....
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