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Precision-engineered double convex lens with ultra-tight tolerances for demanding optical applications in imaging, lighting, and laser systems.
Specifications
Materials
BK7 or other optical glass, quartz, sapphire, Ge, Si, ZnSe, CaF2 etc
Diameter
1.5~300mm
Radius
R0.8mm-∞
Focal length
-30000mm~+30000mm
Center thickness tolerance
+/-0.01mm
Diameter tolerance
+/-0.005mm
Focal length tolerance
+/-1%
Surface accuracy
N=1~3
Irregularity
ΔN=0.1~0.5
Decenter
3''~1''
Surface quality
10/5~60/40
Coating
Upon request
Application area
Imaging, Lighting, Laser etc
Expertise: Mastering the Micron Scale
At the heart of high-performance optical design is the demand for physical consistency. While industry standards often settle for ±0.1mm, our facility specializes in ultra-precision machining, achieving a diameter tolerance of ±0.005mm.
Why 5 Microns Matter: In multi-element lens assemblies or micro-optics housing, a deviation of even 20μm can cause mechanical tilt or decenter, leading to severe coma and astigmatism. Our sub-micron control ensures a "perfect fit" for high-end medical endoscopes and laser fiber coupling.
Symmetric Optimization: Our Double Convex lenses are polished to an irregularity of ΔN = 0.1~0.5, ensuring the wave-front remains undistorted across the entire clear aperture.
Experience: Optimized for 1:1 Imaging & Beyond
Our engineering team leverages decades of experience in applying DCX lenses to real-world challenges. We understand that a Double Convex lens performs at its theoretical peak during 1:1 imaging (finite conjugate systems).
Application Insight: For engineers designing relay systems or image magnification setups, our DCX lenses provide the symmetric power distribution necessary to minimize spherical aberration and distortion.
Material Versatility: Whether you require N-BK7 for visible light, UV Fused Silica for semiconductor inspection, or ZnSe for IR thermal sensing, our manufacturing process maintains the same ±0.005mm precision across all substrates.
Trust is built through transparency. We don't just claim precision; we document it.
Interferometric Validation: Every high-precision batch is inspected using Zygo interferometers, ensuring that the surface power (N) and irregularity (ΔN) meet your exact optical blueprint.
Centration Excellence: With decenter tolerances tightened to 1' arc min, we eliminate beam deviation issues that plague lower-quality mass-produced optics.
Full Traceability: We provide comprehensive Inspection Reports (covering Diameter, CT, and Focal Length) and Coating Curves with every shipment, ensuring your QC process is seamless.
Frequently Asked Questions
Why is a ±0.005mm diameter tolerance critical for multi-element systems?
In complex optical assemblies, such as high-resolution imaging objectives, even a slight mechanical tilt or decentration can lead to significant coma and astigmatism. A ±0.005mm tolerance ensures a "press-fit" precision within the lens barrel, eliminating the need for manual alignment (shimming) and ensuring that the optical axis of the DCX lens remains perfectly centered.
How do you maintain focal length consistency within ±1%?
Focal length is a function of both the surface radii and the center thickness (CT). By controlling the Center Thickness to ±0.01mm and utilizing high-precision CNC polishing to maintain radius consistency, we ensure that the effective focal length (EFL) remains stable. This is vital for industrial sensors where consistent magnification is required across thousands of units.
What are the challenges of polishing Double Convex lenses with a small radius (R0.8mm)?
Small radii create steep surface slopes, which are difficult to polish uniformly. We utilize Sub-aperture Polishing and custom-tooled diamond abrasives to ensure that the surface accuracy (N=1~3) and irregularity (ΔN=0.1~0.5) are maintained right up to the clear aperture, preventing "edge roll-off" which can degrade peripheral image quality.
How do you verify the surface irregularity (ΔN) on a symmetric DCX lens?
We use He-Ne Laser Interferometers (such as Zygo) to capture the phase-shift map of both convex surfaces. For a DCX lens, each side is tested individually against a reference sphere. A ΔN value of 0.1 indicates that the local deviation from the ideal spherical shape is less than 1/10 of a fringe, guaranteeing a near-perfect wavefront.
Can you provide "Scratch-Dig 10/5" for high-power laser applications?
Yes. For laser-grade DCX lenses, we offer 10/5 Surface Quality. This extreme level of polishing removes micro-defects that could otherwise act as absorption centers, potentially leading to laser-induced damage (LIDT). This is essential for focusing high-peak-power pulses in industrial laser cutting and medical surgery.
Which substrate should I choose for a DCX lens in a high-temperature environment?
If the system is subject to thermal shock, Sapphire or Fused Silica are the preferred choices. Sapphire offers a high thermal conductivity and a Mohs hardness of 9, while Fused Silica provides a near-zero coefficient of thermal expansion (CTE). For standard visible imaging, BK7 (K9) remains the most cost-effective solution due to its excellent homogeneity and chemical resistance.
Do you offer custom Anti-Reflection (AR) coatings for these high-precision lenses?
Absolutely. We provide custom thin-film deposition based on your target wavelength. Options include V-Coats for single laser lines (R < 0.1%) and Broadband AR (BBAR) for wide-spectrum imaging. Each shipment includes a spectrophotometer curve to verify the coating's performance.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer
Year Established:
2009
Total Annual:
8000000-10000000
Employee Number:
45~100
Ecer Certification：
Verified Supplier
1. We possess comprehensive capabilities in design, production and sales, providing customers with one-stop convenient procurement services and saving a great deal of time and cost for both new and existing projects.
2. We have tens of thousands of optical molds and samples, offering customers low-... 1. We possess comprehensive capabilities in design, production and sales, providing customers with one-stop convenient procurement services and saving a great deal of time and cost for both new and existing projects.
2. We have tens of thousands of optical molds and samples, offering customers low-...
