An aspheric lens does not have a simple spherical surface; instead, it features a rotationally symmetric, smooth, and continuous aspheric surface that conforms to a specific mathematical expression. This design allows light to pass through the lens along a more optimal path, thereby reducing aberrations and improving image quality. The curvature radius of an aspheric lens varies along the central axis, which enhances optical performance, reduces the number of required optical elements, and lowers design costs.
Elimination of Spherical Aberration
By optimizing their surface shape, aspheric lenses effectively reduce or eliminate spherical aberration at the edges, significantly improving image quality.
Enhanced Focusing Capability
The customizable shape of aspheric lenses allows them to focus light into a smaller spot, making them ideal for applications like laser focusing and optical communications.
Flat Field Performance
Aspheric lenses provide a more uniform light field, maintaining high image quality even at large off-axis angles, which makes them well-suited for illumination systems and projectors.
Multi-Focal Functionality
By adjusting their surface profile, aspheric lenses can achieve multi-focal capabilities, focusing different wavelengths at distinct focal points—beneficial for spectral imaging and measurements.
System Miniaturization and Weight Reduction
The use of aspheric lenses simplifies optical system design, reducing the number of required lenses and thereby decreasing overall size and weight.
Category | Commercial Grade | High-Precision Grade |
Material | Fused Silica (JGS -1) / Corning 7980 | |
Diameter | Ø5mm – Ø600mm | Ø5mm – Ø600mm |
Diameter Tolerance | ±0.1mm | ±0.05mm |
Focal Length Tolerance | ±2% | ±1% |
Surface Quality | 60/40 | 40/20 |
Centration | <3 arc min | <2 arc sec |
Surface Accuracy | RMS <λ/60 | RMS <λ/150 |
Surface Irregularity | ¼λ | ¹⁄₁₀λ |
Clear Aperture | >85% | >90% |
Bevel | <0.2mm × 45° | <0.1mm × 45° |
Coating | Customized per customer requirements Same as Commercial Grade | |
Application Field | Key Benefits |
Optical Instruments | Improve image quality and measurement accuracy by reducing spherical aberration. |
Laser Systems | Optimize beam shape and divergence, enhancing focus efficiency and precision. |
Fiber Optic Communication | Increase signal strength and stability, reduce spot size, and improve transmission quality and distance while minimizing mode interference and crosstalk. |
Imaging Systems | Reduce edge distortion and enhance image quality in devices like night-vision goggles and thermal imagers. |
Automotive Optics | Improve light distribution and image clarity, enhancing nighttime driving safety. |
Medical & Ophthalmology | Correct refractive errors and provide sharper vision. |
Illumination Systems | Deliver a flatter light field and maintain image quality even at large off-axis angles. |
Multi-Focal Functionality | Focus different wavelengths at distinct points, enabling advanced spectral analysis. |
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