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Super hemisphere dome is a spherical cap whose height exceeds that of a hemisphere. Under certain conditions (object point at the center of the sphere), the system can completely eliminate spherical aberration. It can achieve a limiting field of view greater than 180°. Light can enter from the side or even slightly rearward at angles and still be received by the internal sensors. ECOPTIK can manufacture hyperspherical domes exceeding 55% of their radius.
Although it has no spherical aberration at the center, practical optical systems (such as internal lens groups) need to compensate for the field curvature and astigmatism it introduces. Co-optimizing the hyperspherical dome as the first element of the entire optical system is crucial.
The refractive index "n" is a critical parameter. Careful selection of materials with suitable refractive indices is necessary to place the image-side luminous point in a reasonable position and control the ray direction. For infrared applications, commonly used materials include sapphire and ZnS.
Machining a complete spherical dome exceeding the height of a hemisphere while maintaining extremely high surface accuracy and finish places extremely high demands on the manufacturing process.
| Substrate material | K9(CDGM), Sapphire, Si, MgF2, N-BK7, N-BK10, Corining 7980, JGS1, Borofloat 33, ZnSe, ZnS, etc. | Surface Quality | 60/40, 40/20, 20/10, 10/5 |
|---|---|---|---|
| Dimension | 6mm-350mm | Surface fringe | 10(5)-3(0.5) |
| Thickness | 0.5mm-30mm | Coating | Anti-reflection (AR) Coating or upon customer's request |
| Thickness | In general ±0.1mm, Best ±0.02mm | ECOPTIK annual production capacity | over 300,000 pcs |
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