Product Case Studies

Rectangular off-axis parabolic mirror

• Product Name: Freeform Surface Lens
• Surface smoothness: 10-5
• Rq:＜0.5 nm
• Surface accuracy: λ/40RMS
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• Category：Ultra smooth glass non spherical surface、metallic mirror、Glass molded lens、Levicorn spindle、Ultra precision optical mold

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A rectangular off-axis parabolic mirror is a type of parabolic mirror with a specific shape, and its optical characteristics and design goals are different from traditional axial parabolic mirrors. Off axis parabolic mirror is a design with a parabolic shape but not symmetrical around its optical axis. This type of mirror is typically used for specific optical applications, such as focusing light or improving imaging quality, without the need to place the light source or receiver on its optical axis.

General

Basic principles

The basic principle of rectangular off-axis parabolic mirrors is based on the geometric characteristics of paraboloids and the reflection laws of light rays. Here are several key points of this principle:

• Definition of paraboloid：A parabolic surface is a curved surface formed by the intersection of a plane and a cone. All parallel rays incident along the normal of the parabolic surface will be focused on a common focal point after reflection. This feature makes parabolic mirrors very suitable for focusing light.
• Off axis design：Unlike traditional axisymmetric parabolic mirrors, the design of off-axis parabolic mirrors allows the light source or light receiver to be located outside the optical axis of the mirror. This causes light to be reflected at different angles of incidence, thereby focusing the light onto a non axisymmetric focal point. This design is very suitable for applications that require space optimization or have physical limitations.
• Ray propagation：When parallel light rays (such as laser beams) are incident on the surface of a rectangular off-axis parabolic mirror at a specific angle, according to the law of reflection, the incident light rays will be reflected and focused onto a focal point. The design of the mirror shape ensures that the reflected light, although not propagating along the optical axis, can still be focused.
• Application effect：Through appropriate geometric design, rectangular off-axis parabolic mirrors can optimize the focusing effect of light, reduce aberrations and other imaging distortions, thereby improving imaging quality. This makes it widely used in various high-performance optical systems, such as telescopes, laser imaging systems, optical sensors, and spectrometers.

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