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Bena Optics' Off-Axis Parabolic Mirrors: Precision in Focus

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    In the realm of optical engineering, achieving precise beam focusing and collimation without introducing spherical aberration is a critical challenge. Bena Optics' Off-Axis Parabolic (OAP) Mirrors are designed to address this challenge head-on, providing unparalleled precision and flexibility in optical systems.

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    The Unique Advantage of Off-Axis Parabolic Mirrors

    Off-Axis Parabolic Mirrors (OAP) are a segment of a larger parabolic mirror, offering a unique advantage over their centered counterparts. While both types of mirrors can focus collimated light to a point, OAP mirrors allow for greater interaction space around the focal point without disrupting the beam, as illustrated in Figure 2.

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    Figure 2: The schematic diagram of OAP shows how their unique shape allows the focal point of the mirror to be approached.

    Focusing Collimated Light

    When collimated light is incident on an OAP mirror, it converges to a single focal point. This capability is particularly useful in applications where maintaining beam integrity is crucial, such as in laser systems and optical instrumentation.

    Variability in Design

    The angle between the focal point and the central ray axis varies depending on which portion of the parabolic shape the OAP mirror replicates. This variability is demonstrated in Figure 3, which models 15° and 45° OAP mirrors. It's essential to ensure that the incident beam remains parallel to the optical axis; any angular displacement can introduce comatic aberration, affecting the beam's quality.

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    Figure 3: Schematic diagrams of 15° and 45° off-axis parabolic (OAP) mirrors.

    Diverse Coating Options

    Bena Optics offers a range of coating options for OAP mirrors, tailored to meet the specific requirements of various optical applications. These coatings enhance the performance and longevity of the mirrors, ensuring they function optimally in different environments and spectral ranges.

    Common Coating Types

    Protective Coatings: These coatings protect the mirror surface from environmental factors like moisture and dust, extending the mirror's lifespan.

    Anti-Reflective Coatings: Designed to minimize reflection losses, these coatings improve the transmission efficiency of the mirror, particularly in high-precision optical systems.

    High-Reflective Coatings: These coatings are optimized for specific wavelengths, ensuring maximum reflection and focusing efficiency in laser and other wavelength-sensitive applications.


    Applications of OAP Mirrors

    • Laser Systems: In laser applications, the precise focusing and collimation capabilities of OAP mirrors are crucial for maintaining beam quality and efficiency. They are frequently used in laser cutting, welding, and material processing, where precise beam control is essential.

    • Optical Instrumentation: OAP mirrors are integral to various optical instruments, including telescopes, microscopes, and imaging systems. Their ability to focus light without introducing aberrations enhances the performance of these instruments, enabling clearer and more accurate observations.

    • Industrial and Research Applications: In industrial settings and research laboratories, OAP mirrors are used in a variety of precision measurement and alignment tasks. Their versatility and high precision make them indispensable in fields ranging from semiconductor manufacturing to quantum optics.

    Bena Optics' Off-Axis Parabolic Mirrors represent a significant leap forward in optical engineering, offering unparalleled precision and flexibility in beam focusing and collimation. With a range of coating options tailored to meet diverse application needs, these mirrors ensure optimal performance across a wide spectrum of industries.

    Off-Axis Parabolic Mirror (OAP) Specifications Comparison

    Name

    Coating Option

    Off-Angle Options

    Surface Roughness

    Alignment Through-Hole

    Designed for Ultrafast Laser Pulses

    Reflectivity Parameters

    Gold-coated OAPs

    Bare Gold & Protected Gold

    15°, 30°, 45°, 60°, 90°

    <50Å & <100Å

    No

    No

    Ravg≥94% (700-800nm)
    Ravg≥97% (800-2000nm)
    Ravg≥98% (2000-12000nm)

    Aluminum-coated OAPs

    Protected Aluminum

    15°, 30°, 45°, 60°, 90°

    <50Å & <100Å

    No

    No

    Ravg≥85% (400-700nm)
    Ravg≥97% (2000-12000nm

    Enhanced Aluminum OAPs

    Enhanced Aluminum

    -

    -

    No

    No

    Ravg>89% (250-450nm)
    Ravg>85% (250-700nm)

    Silver-coated OAPs

    Protected Silver

    90°

    <100Å

    No

    No

    Ravg≥98% (2000-12000nm)

    Laser Line OAPs

    Laser Line Coating

    90°

    <50Å

    No

    No

    >99.5% Reflectivity at Nd:YAG wavelength

    Ultrafast-enhanced Silver OAPs

    Ultrafast-enhanced Silver

    90°

    <50Å

    No

    Yes
    (Low GDD: ±20fs² @600-1050nm)

    Rs>99% @600-1000nm (0°)
    Rp>99% @540-1000nm (45°)
    Rp>98.5% @730-870nm (45°)

    OAPs with Alignment Holes

    Enhanced Al/Protected Au/Protected Ag

    90°

    <50Å

    Yes

    No

    -


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