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Super-Hemispherical Dome
Optical Windows

Super-Hemispherical Dome

Supplier
Ecoptik
Category
Optical Windows
Origin
China

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.

Specification Snapshot
Thickness
0.5mm-30mm
Thickness [In general]
±0.1mm
Thickness [Best]
±0.02mm
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Overview

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.

Specifications

ParameterValue
Substrate materialK9(CDGM), Sapphire, Si, MgF2, N-BK7, N-BK10, Fused silica (JGS1), Corining7980, Borofloat 33, etc.
Surface Quality60/40, 40/20, 20/10, 10/5
Dimension6mm-350mm
Surface fringe10(5)-3(0.5)
Thickness0.5mm-30mm
Coating [upon customer's request]Anti-reflection (AR) Coating or upon customer's request
Thickness [In general]±0.1mm
Thickness [Best]±0.02mm

Applications

Missile Seekers：This is the most typical application. Used to achieve "over-the-shoulder launch" or omnidirectional attack capabilities, enabling the seeker to see targets to the side, rear, or even behind. It is usually used in conjunction with an infrared imaging system. Underwater Optical Systems：Provides AUVs/ROVs with a wide-angle field of view exceeding 180°, virtually eliminating blind spots. All-Sky Imaging Systems：Special lenses used to capture 360°×360° panoramic images; a hyperspherical dome can serve as its front element. Cutting-Edge Surveillance and Sensing：Used in special situations requiring near-omnidirectional sensing with a single lens.

Key Features

Aberration Control：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. Material and Refractive Index Selection：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. Extreme Manufacturing Difficulty：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.

Datasheet

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Supplier Information

Ec
Ecoptik
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ECOPTIK has been researching optical component fabrication technology for 15 years. We manufacture precision optics such as dome, spherical lens, micro-optical component, cylindrical mirror, filter, prism, and window. We offer glass materials from Schott, CDGM, Corning, and Sapphire, CaF2, MgF2, Fused Silica, Si, etc. We offer lens assembly service. We possess ZYGO laser interferometers, ZEISS CMM Spectrum, and Agilent Cary 7000 UMS for testing and providing product reports.

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