Frequently Asked Questions
Q1: How do you achieve a diameter tolerance of ±0.005mm for small lenses?
Achieving micron-level precision requires a combination of high-stability CNC grinding machines and strictly controlled ambient temperatures in our facility. For lenses between 1.5mm and 10mm, we utilize specialized micro-optics centering equipment to ensure both dimensional accuracy and minimal decenter (down to 1").
Q2: What is the significance of "Irregularity ΔN = 0.1~0.5"?
While Surface Accuracy (N) refers to the overall power deviation, Irregularity (ΔN) measures the local variation or "smoothness" of the lens surface. A ΔN of 0.1 indicates a nearly perfect spherical surface, which is essential for diffraction-limited imaging and high-power laser systems to prevent beam distortion and hot spots.
Q3: For IR materials like Germanium (Ge) and ZnSe, how do you manage surface quality?
IR crystals are generally softer and more brittle than BK7 glass. We employ specialized diamond turning (SPDT) and custom polishing slurries to achieve a 20-10 Scratch-Dig surface quality. This prevents subsurface damage and ensures high transmission efficiency in the 8μm to 12μm range.
Q4: Can you manufacture lenses with an extremely short radius (R0.8mm)?
Yes. Our production line is optimized for high-curvature optics. Manufacturing a 0.8mm radius requires custom-made diamond tools and precise interferometric monitoring to ensure the focal length remains within the specified ±1% tolerance.
Q5: When should I specify CaF₂ (Calcium Fluoride) instead of Quartz?
While Quartz is excellent for UV, CaF₂ is preferred when your application spans from the Vacuum UV (180nm) to the mid-infrared (7μm). Additionally, CaF₂ has a low refractive index and low chromatic aberration, making it ideal for high-end apochromatic lens designs.
Q6: How do you ensure the durability of coatings on Sapphire substrates?
Sapphire is exceptionally hard (9 on the Mohs scale). To ensure coating adhesion, we use Ion-Assisted Deposition (IAD) technology. This process increases the packing density of the thin films, making the coating as rugged as the substrate itself, capable of passing severe abrasion and humidity tests.
Q7: Do you provide certification for the focal length and surface accuracy?
Yes. Every high-precision order can be provided with a Metrology Report. We use Zygo NewView interferometers for surface topography and automated focal length meters to verify that every parameter—from N values to center thickness—meets your exact blueprint.
