Elliptical Mirrors

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Optics Precision Elliptical Flat Mirrors

Elliptical Mirrors

Elliptical Mirrors are high-precision optical components designed for laser beam shaping in spectroscopy, medical lasers, and industrial cutting systems. Made from UV-grade fused silica or aluminum substrates with enhanced dielectric coatings, they offer >99% reflectivity across 200 nm–12 µm wavelengths and precise elliptical curvature for accurate beam focusing/redirecting.

As a china manufacturer, we provide:

Custom elliptical geometries (aspect ratios 1:1.5–1:5) and surface finishes (Ra < 5 nm)

Fast turnaround for both standard (50–200 mm diameters) and custom sizes

Coatings optimized for UV, visible, or IR applications (including gold/silver for high-power lasers)

Rigorous optical testing to ensure <λ/8 flatness and 20-10 scratch-dig compliance

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Product Description

Product Overview

Design & Geometry

Elliptical mirrors feature a curved surface defined by an elliptical profile with two focal points (F₁, F₂). Light emitted from one focus (F₁) converges to the second focus (F₂) after reflection, enabling precise beam collimation or focusing. The elliptical axis ratio (semi-major to semi-minor axis) ranges from 1:1 to 5:1, customizable for specific beam shaping needs.

Materials & Coatings

Substrates:

UV Fused Silica (CTE: 0.55 ppm/°C): Ideal for high-precision environments requiring thermal stability (e.g., aerospace, metrology).

BK7 Glass: Cost-effective option with excellent visible-light transmission (400–700 nm), suitable for general industrial applications.

Coatings:

Metallic: Aluminum (UV-Vis, 200–800 nm, ≥90% reflectivity), silver (Vis-IR, 450–20,000 nm, ≥97% reflectivity), gold (IR, 2–20 μm, ≥98% reflectivity).

Dielectric: Multilayer coatings for narrow-band high reflectivity (≥99.5% @ 750–1100 nm), minimizing absorption in laser spectroscopy.

Manufacturing Standards

Surface Finish: Polished to <1 nm RMS roughness for minimal scatter.

Flatness: λ/10 @ 633 nm (≤63 nm deviation) tested via interferometry.

Edge Treatment: Beveled (0.2–0.5 mm) to prevent chipping during mounting.

Elliptical Mirrors

Parameter Information

Product: Elliptical Mirrors

Material: UVFS, Aluminum

Clear Aperture: >90%

Diameter Tolerance: +0.0/-0.1mm

Bevel: Break sharp edges

Irregularity(P-V): <1/10L@633nm

Surface Quality: 20-10

Thickness Tolerance: +/-0.1mm

Features of Elliptical Mirrors

Beam Focusing Efficiency

Achieves spot sizes as small as 30 μm (for 50 mm diameter, 1:1 aspect ratio) when focusing collimated beams, critical for micro-machining and confocal microscopy.

Adjustable Optical Properties

Focal Length: Customizable from 25 mm to 300 mm to accommodate divergent or collimated input beams.

Aperture Size: Available in diameters from 12.7 mm to 100 mm, with thicknesses of 6–10 mm for mechanical stability.

Environmental Resilience

Protective overcoats (SiO₂ for silver, Al₂O₃ for gold) enhance resistance to humidity (≤95% RH) and temperature fluctuations (-20°C to +80°C).

Low Wavefront Distortion

Engineered to maintain wavefront error <λ/20 @ 633 nm, ensuring high-quality beam propagation in interferometric setups.

Applications of Elliptical Mirrors

Industrial Laser Systems

Laser Cutting/Drilling: Focus high-power CO₂ or fiber lasers (1064 nm, 10.6 μm) for precise material processing.

Beam Combining: Merge multiple laser beams into a single focal point for additive manufacturing.

Biomedical Engineering

Optical Tweezers: Trap and manipulate microscale particles (e.g., cells, beads) using tightly focused infrared beams (800–1000 nm).

Endoscopic Imaging: Fold optical paths in miniaturized endoscopes to achieve 200–300 μm diameter probes for minimally invasive surgery.

Spectroscopy & Metrology

FTIR Spectrometers: Collimate infrared beams (2–20 μm) for chemical analysis in pharmaceutical quality control.

Surface Profiling: Serve as reference mirrors in white-light interferometers for nanometer-scale topography measurements.

Astronomy & Remote Sensing

Adaptive Optics: Correct atmospheric turbulence in telescopes by focusing light from adaptive mirror systems.

Hyperspectral Imaging: Direct broad-spectrum light (400–2500 nm) onto detector arrays for environmental monitoring.

FAQ of Elliptical Mirrors

What factors determine elliptical mirror selection?

Key parameters include wavelength range, required focal length, beam divergence, and environmental conditions (e.g., temperature, humidity).

Can elliptical mirrors handle pulsed laser systems?

Yes, with damage thresholds up to 1.5 J/cm² (10 ns pulses, 1064 nm) for dielectric coatings and 500 W/cm² for continuous-wave IR applications.

How is alignment performed?

Use kinematic mounts with 3-point adjustment for precise positioning, ensuring the optical axis aligns with the elliptical foci.

What is the lead time for custom elliptical mirrors?

Standard lead times are 2–3 weeks for stock sizes; custom coatings/geometries require 4–6 weeks due to specialized fabrication.

Why Choose Us

Precision Engineering

Our Elliptical Mirrors undergo 3D profilometry and spectrophotometric testing to ensure <0.1% deviation from specified reflectivity curves.

Rapid Prototyping

In-house coating facilities (ion-beam sputtering, electron-beam evaporation) enable fast turnaround for custom wavelength requirements (e.g., 355 nm UV optimization).

Global Compliance

Meet ISO 9001:2015 quality standards and RoHS/REACH environmental regulations, with material traceability documentation provided for every order.

Application Support

Dedicated optical engineers assist with system integration, offering beam propagation simulations and thermal stress analysis for complex setups.