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    你的位置:首頁 > 技術文章 > 離軸拋物面鏡選擇指南

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    離軸拋物面鏡選擇指南

    技術文章

    Off-Axis Parabolic Mirror Selection Guide

    Parabolic mirrors have the ability to focus collimated light without introducing spherical aberration. An Off-Axis Parabolic (OAP) mirror is simply a side section of a parent parabolic mirror. Collimated light that is incident to an OAP mirror is focused to a point. However, unlike a centered parabolic mirror, an OAP mirror has an advantage in that it allows more interactive space around the focal point without disrupting the beam as shown in Figure 1.

    Figure 1: Off-Axis Parabolic Metal Mirrors

     

    Depending on which section of a parabolic shape an OAP mirror is replicating, the angle between the focal point and the central ray axis can be large or small. Figure 2 represents this phenomena by modeling a 15° and 45° off axis mirror respectively. Note: It is important to keep the incident beam parallel to the optical axis, any angular displacement will produce comatic aberration.

    Figure 2: Diagrams of 15° and 45° OAP mirrors

     

    Edmund Optics offers three types of off-axis parabolic mirrors: metal, high performance, and low scatter. Table 1 compares the substrate, controlled scattering ability, and price of the three different types.

     

    Selection Guide

    The following selection guide provides helpful information detailing the strengths and limitations of each OAP type.

    Off-Axis Parabolic Metal Mirrors

    Metal mirrors are available in 15°, 30°, 45°, 60°, or 90° Off-Axis options. Each of these options comes with a coating choice of Protected Aluminum, Protected Gold, or Bare Gold. These coatings allow great reflectivity across a range of spectral regions. Edmund Optics also offers different diameter selections for each coating and angle. Typically, these mirrors are used as collimators in Schlieren and MTF systems, but gold coated off-axis parabolic mirrors can also be used in FLIR test systems.

    Figure 3: Theoretical Reflectance Curves for Metal Mirror

     

    Strengths

    Limitations

    ØAluminum substrate mirrors.

    ØAvailable in 15°, 30°, 45°, 60°, or 90° Off-Axis Options

    ØAluminum and Gold Coating Options

    ØDue to the 175Å surface roughness, these mirrors are not suitable for visible and UV applications that require low scatter

     

    High Performance Off-Axis Parabolic Mirrors

    Edmund Optics also offers high performance glass substrate off-axis parabolic mirrors with superior surface accuracy for increased focusing ability. Typical applications include use in Czerny-Turner and Littrow spectrometer configurations and in general collimator and beam expander setups. These mirrors work extremely well in the UV to visible light spectrum.

    Figure 4: Simulation Result of Aluminum Coating Reflectance between 10,000nm and 20,000nm

     

    Strengths

    Limitations

    ØHigh Quality Glass Substrate

    Øλ/4 or λ/2 Surface Accuracy

    ØIdeal for UV and Visible Applications

    ØTypically longer focal length

    ØRequires angled mounting making alignment more challenging

    ØGlass substrate is not suitable for terahertz frequency applications

     

    Low Scatter Off-Axis Parabolic Mirrors

    TECHSPEC® Low Scatter Off-Axis Parabolic Mirrors are designed to direct and focus incident collimated light at a specific angle with minimal scatter loss. By using a specialized manufacturing process, the aluminum substrate low scatter OAP mirrors decrease scatter in the visible spectrum. Each mirror has been visually inspected with a HeNe laser to ensure low scatter.

    Figure 5: Typical Scatter Profiles. Left is standard grade OAPM, while right is TECHSPEC® Low Scatter OAPM

     

    Strengths

    Limitations

    ØDesigned for Low Scatter in the Visible Spectrum

    ØAluminum Substrate Mirrors

    ØImproved Surface Roughness and Surface Figure

    ØMust operate in a clean environment

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