Collimating Mirror: Spectral Range 200-2000 nm

Q: What is the purpose of a collimating mirror in an optical spectrometer?

It converts divergent light into a parallel beam to ensure accurate wavelength dispersion and high spectral resolution by minimizing optical aberrations.

Q: How does the material of a collimating mirror affect its performance?

The substrate and coating materials determine reflectivity, durability, and spectral range; for example, gold coatings are used for IR applications, while aluminum is common for UV-visible ranges.

Component Specifications

Definition

A collimating mirror is a precisely curved reflective optical element designed to collect and redirect divergent light rays from a source into a parallel or collimated beam. In optical spectrometers, it ensures that light entering the dispersion element (such as a grating or prism) is uniform and aligned, minimizing aberrations and maximizing spectral resolution and accuracy. It typically features a parabolic or spherical curvature optimized for specific wavelength ranges and is critical for maintaining the integrity of spectral data.

Working Principle

The collimating mirror operates based on the principle of reflection and geometric optics. Divergent light rays from a source (e.g., a slit or fiber) strike the mirror's curved surface. According to the mirror's shape (often parabolic), these rays are reflected such that their paths become parallel to each other, creating a collimated beam. This parallel alignment ensures that all light rays travel in the same direction, reducing angular spread and improving the spectrometer's ability to separate wavelengths accurately during dispersion.

Materials

Typically made from high-purity substrates like fused silica, borosilicate glass, or metal alloys (e.g., aluminum), with a reflective coating such as aluminum, silver, or gold optimized for specific spectral ranges (e.g., UV, visible, IR). Coatings may include protective layers like silicon dioxide or magnesium fluoride to enhance durability and reflectivity.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Diameter	10-100 mm
Coating Type	Aluminum with MgF2 overcoat
Focal Length	50-500 mm
Reflectivity	>90% in specified range
Spectral Range	200-2000 nm
Surface Accuracy	λ/10 to λ/20

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

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

Misalignment leading to beam divergence
Coating degradation over time
Thermal expansion affecting focal length

FMEA Triads

Trigger: Improper installation or vibration
Failure: Mirror misalignment causes reduced spectral resolution
Mitigation: Use precision mounts and regular calibration checks

Trigger: Exposure to harsh environments
Failure: Coating corrosion reduces reflectivity
Mitigation: Apply protective coatings and control operating conditions

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Surface figure tolerance within λ/10, alignment tolerance <0.1 mrad

Test Method

Interferometry for surface accuracy, spectrophotometry for reflectivity, and beam profiling for collimation quality

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

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Inspection readiness

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Manufacturers of Collimating Mirror

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Frequently Asked Questions

What is the purpose of a collimating mirror in an optical spectrometer?