An optical coaxial aspheric surface is a lens surface design where the radius of curvature continuously changes along the central axis. This design improves optical quality, reduces the number of optical elements, and lowers design costs. Compared to spherical lenses, this design has unique advantages, making it widely used in optical instruments, imaging, and optoelectronic industries, such as digital cameras, CD players, and high-end microscopy instruments.
The main characteristics of optical coaxial aspheric surfaces include the following aspects:
1. Elimination of Spherical Aberration: Compared to spherical lenses, aspheric lenses can effectively reduce or eliminate the distortions that occur at the edges of spherical lenses by optimizing the surface shape, thereby improving image clarity and accuracy.
2. Improved Focusing Ability: Aspheric lenses can be customized to focus light into smaller spots, which is particularly important in fields such as laser focusing and optical communications.
3. Flat Light Field: Aspheric lenses can provide a flatter light field, maintaining good image quality even at larger off-axis angles. This is very useful in applications such as lighting systems and projectors.
4. Multifocal Functionality: By adjusting the surface shape of aspheric lenses, it is possible to achieve multifocal functionality, focusing different wavelengths of light at different focal points. This is suitable for applications that need to handle multiple wavelengths.
5. Enhanced Imaging Quality: Aspheric lenses can focus light based on the position and angle of incidence, significantly improving image clarity and resolution while reducing aberrations and chromatic distortions.
6. Size and Weight Advantages: Aspheric lenses can be designed to be thinner and lighter while achieving the same functionality, making optical systems more compact and portable.
7. Wide Range of Refractive Index Adjustment: Aspheric lenses have a broader range of refractive index adjustments, making them suitable for correcting various refractive errors such as myopia and hyperopia.
The application fields of optical coaxial aspheric surfaces are very extensive, including but not limited to:
1. Optical Instruments: Such as high-end microscopy instruments and digital cameras.
2. Optical Communications: Used in laser focusing and fiber optic communications.
3. Photography Lenses: Providing higher image quality and smaller size.
4. Medical Devices: Used in ophthalmic correction and treatment equipment.
5. Industrial Applications: Such as laser processing and measurement instruments.
These characteristics make aspheric lenses widely used in optical systems that require high-precision imaging and high efficiency.
| Specifications | Commercial spec. | High precision spec. |
| Material | Fused silica, Zerodur, SiC | |
| Dimension | 5mm~1200mm | |
| Dimension tolerance | ±0.1mm | ±0.05mm |
| Surface quality | 60/40 | 20/10 |
| Surface accuracy | RMS<λ/30@632.8nm | RMS<λ/150@632.8nm |
| Clear aperture | >85% of dim | >90% of dim |
| Surface roughness | Ra<3nm | Ra<1nm |
| Eccentricity | <3’ or higher | |
| K-value | As per the drawing | |
| Bevel | <0.2mm x 45deg | <0.1mm x 45deg |
| Coating | Up on clients’ request | |
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