INDUSTRY COMPONENT

Focusing Mirror

A precision optical component in spectrometers that focuses light onto the detector for accurate spectral analysis.

Component Specifications

Definition
A focusing mirror is a critical optical component within an optical spectrometer system designed to collect and converge dispersed light from a diffraction grating or prism onto a detector array. It ensures optimal light intensity and spatial resolution at the focal plane, enabling precise wavelength measurement and spectral analysis. These mirrors are engineered with specific curvature profiles (typically parabolic or spherical) to minimize optical aberrations and maximize signal-to-noise ratio in spectroscopic applications.
Working Principle
The focusing mirror operates on the principle of reflection and geometric optics. Light rays from the dispersion element strike the mirror's curved reflective surface at various angles. According to the law of reflection, each ray is reflected toward a common focal point where the detector is positioned. The mirror's precise curvature ensures all wavelengths converge accurately, maintaining linear dispersion relationships and minimizing chromatic aberrations across the spectral range.
Materials
Substrate: Fused silica or Zerodur (low thermal expansion glass-ceramic) with surface roughness < 1 nm RMS. Coating: Protected aluminum (Al+MgF2) for UV-VIS range (250-800nm) or enhanced silver (Ag+protective layers) for VIS-NIR range (400-2000nm). Reflectivity > 90% across specified wavelength range.
Technical Parameters
ParameterTypical rangeNotes & selection driver
Diameter25-100 mm
Focal Length150-500 mm
Spectral Range250-2000 nm
Incidence Angle0-45 degrees
Surface Accuracyλ/8 @ 632.8 nm
Coating Reflectivity>90%

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards
ISO 10110, ISO 14999, DIN 3140

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Coating degradation from environmental exposure
  • Surface contamination affecting reflectivity
  • Mechanical misalignment due to vibration
  • Thermal expansion causing focal shift
FMEA Triads
Trigger: Improper handling during installation
Failure: Surface scratches or coating damage
Mitigation: Implement cleanroom protocols, use vacuum handling tools, and provide certified installation training
Trigger: Thermal cycling in uncontrolled environments
Failure: Focal length drift and reduced spectral resolution
Mitigation: Use low-expansion substrates (Zerodur), implement temperature stabilization, and design thermal compensation mechanisms
Trigger: Chemical exposure from laboratory atmospheres
Failure: Coating corrosion and reflectivity loss
Mitigation: Apply protective overcoatings, maintain controlled humidity (<40% RH), and use sealed optical compartments

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
Surface figure tolerance: λ/8 PV, Focal length tolerance: ±0.5%, Angular alignment: ±0.1°
Test Method
Interferometric testing per ISO 14999, Spectral reflectometry, Coordinate measurement machine (CMM) verification

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
Verify equipment lists, process limits, capacity, and representative production evidence.
Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Focusing Mirror

Manufacturer profiles associated with Focusing Mirror.

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Frequently Asked Questions

What is the difference between spherical and parabolic focusing mirrors in spectrometers?

Spherical mirrors are easier to manufacture but introduce spherical aberration at off-axis angles, suitable for low-resolution systems. Parabolic mirrors eliminate spherical aberration completely, providing superior image quality for high-resolution spectrometers but require precise alignment.

How often should spectrometer focusing mirrors be cleaned or replaced?

With proper handling in controlled environments, focusing mirrors typically require cleaning every 6-12 months using approved optical cleaning procedures. Replacement is only necessary if surface damage, coating degradation, or permanent contamination occurs, which can happen after 3-5 years of continuous use.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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