INDUSTRY COMPONENT

Focusing Mirror

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

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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
  • Diameter 25-100 mm
  • Focal Length 150-500 mm
  • Spectral Range 250-2000 nm
  • Incidence Angle 0-45 degrees
  • Surface Accuracy λ/8 @ 632.8 nm
  • Coating Reflectivity >90%
Standards
ISO 10110, ISO 14999, DIN 3140

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Focusing Mirror.

focusing mirror spectrometer mirror optical component spectroscopic analysis concave mirror light focusing spectral resolution Focusing Mirror in Computer, Electronic and Optical Product Manufacturing

Parent Products

This component is used in the following industrial products

Optical Spectrometer

An analytical instrument that measures the intensity of light as a function of wavelength to determine the elemental composition of materials.

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Spectrometer Unit

The core optical component of a spectroscopic analyzer that separates light into its constituent wavelengths for measurement.

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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

Interchangeable Parts

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

Buyer Feedback

★★★★☆ 4.8 / 5.0 (23 reviews)

"Reliable performance in harsh Computer, Electronic and Optical Product Manufacturing environments. No issues with the Focusing Mirror so far."

"Testing the Focusing Mirror now; the technical reliability results are within 1% of the laboratory datasheet."

"Impressive build quality. Especially the technical reliability is very stable during long-term operation."

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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.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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