Off-Axis Parabolic Mirror (NewOpto OAP Series)
| Brand | NewOpto |
|---|---|
| Model | Off-Axis Parabolic Mirror |
| Origin | Zhejiang, China |
| Component Category | Optical Element |
| Coating | Protected Aluminum (Al + SiO₂) |
| Surface Accuracy | λ/4 @ 633 nm (typical) |
| Surface Quality | 20–10 scratch-dig |
| Clear Aperture | ≥90% of nominal diameter |
| Focal Length Range | 25 mm to 500 mm (custom available) |
| Off-Axis Distance | 5 mm to 150 mm (configurable) |
| Substrate Material | Fused Silica or BK7 (standard) |
Overview
The Off-Axis Parabolic Mirror (OAP) is a precision reflective optical component engineered to collimate or focus light without introducing chromatic aberration—critical in broadband and ultrafast laser applications where dispersion-free performance is non-negotiable. Unlike spherical or aspheric mirrors, the OAP is derived from a parent paraboloid but utilizes only a laterally displaced segment, eliminating central obscuration and enabling unobstructed beam paths. This geometry supports high-numerical-aperture imaging, tight focusing of femtosecond pulses, and efficient coupling into single-mode fibers or vacuum chambers. The NewOpto OAP series is fabricated using deterministic magnetorheological finishing (MRF) and verified via phase-shifting interferometry (PSI), ensuring surface accuracy compliant with ISO 10110-5 standards. Each mirror is designed for operation across UV-VIS-NIR (250–2000 nm), with protected aluminum coating optimized for >90% average reflectivity and low wavefront distortion.
Key Features
- Zero chromatic aberration: Ideal for broadband spectroscopy, FTIR, and ultrafast pulse delivery where refractive optics introduce group delay dispersion.
- Off-axis geometry eliminates central obstruction—enabling compact, folded optical layouts in space-constrained environments such as vacuum beamlines or UAV-mounted radiometers.
- Available in both wedged and equi-thick substrate configurations to suppress ghost reflections and cavity etaloning in high-finesse interferometric systems.
- Fused silica substrates offer superior thermal stability (CTE ≈ 0.55 × 10⁻⁶ /°C) and low fluorescence—essential for UV lithography alignment and deep-UV metrology.
- Surface accuracy specified as λ/4 RMS @ 633 nm (interferometrically verified); surface quality rated 20–10 scratch-dig per MIL-PRF-13830B.
- Customizable parameters: Parent focal length (PFL), zonal radius (ZR), clear aperture (CA), and mounting interface (e.g., kinematic flexure mounts or threaded housings).
Sample Compatibility & Compliance
NewOpto OAP mirrors are compatible with standard optomechanical platforms including Thorlabs, Newport, and Standa kinematic mounts. All mirrors undergo 100% surface inspection under dark-field illumination and pass spectral reflectance validation per ASTM E430–17. Coating adhesion is tested per MIL-C-48497A; environmental durability meets ISO 9211-3 for humidity, temperature cycling, and abrasion resistance. For regulated laboratory use—including FDA-regulated analytical instrumentation and GLP-compliant optical test benches—the mirrors support full traceability documentation (certificates of conformance, interferogram archives, and coating spectral data logs).
Software & Data Management
Each shipped OAP includes a digital metrology dossier: calibrated interferometric surface error map (Zernike decomposition up to 37 terms), reconstructed surface profile (ASCII .xyz format), and measured reflectance spectrum (250–2000 nm, ±0.5 nm resolution). These datasets integrate natively with Zemax OpticStudio (via .DAT import), CODE V, and MATLAB-based wavefront analysis toolchains. Optional API-accessible metadata endpoints allow automated ingestion into LIMS or instrument calibration management systems supporting ISO/IEC 17025 audit requirements.
Applications
- Laser beam collimation and focusing in Ti:sapphire, Yb:fiber, and OPCPA systems—maintaining diffraction-limited spot size and M² < 1.1.
- Target simulators and collimators for infrared seeker testing, requiring precise angular divergence control (< ±0.1 mrad) and stray-light suppression.
- MTF measurement stations: Used as pupil-relay optics in modulation transfer function testbenches per ISO 12233 and ISO 9335.
- FTIR spectrometers and Fourier-transform radiometers: Enabling high-throughput, aberration-free throughput in Michelson and Martin–Puplett interferometer architectures.
- Beam expanders and pulse compressors in chirped-pulse amplification (CPA) chains—where wavefront fidelity directly impacts compressor efficiency and post-compression pulse duration.
- Vacuum-compatible optical train components for synchrotron beamlines and EUV metrology setups (UHV-rated variants available upon request).
FAQ
What does “off-axis” mean in this context?
It refers to the geometric extraction of a reflective segment from a parent paraboloid, displaced laterally from its optical axis—eliminating central obstruction and enabling unvignetted, non-telecentric beam manipulation.
Can I specify custom focal length and off-axis distance?
Yes. NewOpto accepts custom PFL (25–500 mm) and ZR (5–150 mm) combinations; lead time extends by 4–6 weeks for non-standard configurations.
Is the protected aluminum coating suitable for UV applications below 300 nm?
Standard Al+SiO₂ coating delivers >85% reflectivity at 254 nm; for enhanced UV performance down to 193 nm, MgF₂ overcoated variants are available (contact engineering support).
Do you provide interferometric test reports with each unit?
Yes—every OAP ships with a NIST-traceable interferogram, PV/RMS surface error summary, and Zernike coefficient table in PDF and ASCII formats.
Are these mirrors compatible with ultra-high vacuum (UHV) environments?
Standard versions meet ISO 10110-7 Class 5 outgassing specifications; UHV-qualified variants (with low-outgassing epoxy bonding and bake-out certified substrates) are offered under part suffix “-UHV”.
