INDUSTRY COMPONENT

Cavity Structure/Spacer

Precision spacer maintaining cavity dimensions in optical resonators for laser stability.

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Component Specifications

Definition
A critical mechanical component in optical resonators that precisely separates and aligns reflective surfaces (mirrors) to define the resonant cavity length. It ensures dimensional stability against thermal expansion, mechanical stress, and environmental factors, directly influencing the resonator's optical path length, mode structure, and laser output characteristics such as wavelength stability and beam quality.
Working Principle
The spacer maintains a fixed physical distance between resonator mirrors, establishing the optical cavity length (L). This length determines the resonant frequencies (longitudinal modes) via the condition L = m(λ/2), where m is an integer and λ is the wavelength. It mechanically constrains the mirrors to ensure parallel alignment, minimizing diffraction losses and mode distortion. Thermal management principles are often integrated to counteract length variations from temperature changes.
Materials
Typically ultra-low expansion (ULE) materials: fused silica, Zerodur, or Cervit for thermal stability; invar or super-invar for metallic options; sometimes silicon carbide or carbon composite for high stiffness-to-weight ratios. May include thermally conductive elements like copper for active temperature control.
Technical Parameters
  • Length 10 mm to 500 mm (cavity-dependent)
  • Diameter 10 mm to 100 mm (typical)
  • Parallelism < 1 arcsecond
  • Length Tolerance ±0.1 μm to ±1 μm
  • Surface Flatness λ/10 to λ/20 at 633 nm
  • Thermal Expansion Coefficient < 1 × 10⁻⁷ /K
Standards
ISO 10110, ISO 14999, DIN 3140

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Cavity Structure/Spacer.

optical resonator spacer cavity structure laser cavity length ULE spacer thermal stability precision alignment invar spacer fused silica spacer resonator component Cavity Structure/Spacer Cavity Structure/Spacer in Computer, Electronic and Optical Product Manufacturing

Parent Products

This component is used in the following industrial products

Optical Resonator

A cavity structure that confines and amplifies light through multiple reflections to sustain laser oscillation.

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Engineering Analysis

Risks & Mitigation
  • Thermal drift altering cavity length
  • Mechanical creep over time
  • Vibration-induced misalignment
  • Material outgassing in vacuum systems
FMEA Triads
Trigger: Temperature fluctuations
Failure: Cavity length change, wavelength drift
Mitigation: Use ULE materials; implement active temperature stabilization with Peltier elements or ovens.
Trigger: Mechanical stress from mounting
Failure: Bending, loss of parallelism
Mitigation: Design symmetric mounting; use stress-relieved materials; apply finite element analysis (FEA) for load distribution.
Trigger: Vibration from environment or equipment
Failure: Mirror misalignment, phase noise
Mitigation: Employ vibration isolation platforms; design rigid, high-stiffness spacer geometries; use damping materials.

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Length tolerance per ISO 10110-5; surface specifications per ISO 14999
Test Method
Interferometric measurement (e.g., Fizeau interferometer) for length and flatness; autocollimator for parallelism; thermal cycling tests for expansion coefficient verification.

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

Why is thermal expansion coefficient critical for cavity spacers?

A low thermal expansion coefficient (e.g., <1e-7/K) minimizes cavity length changes with temperature, ensuring stable resonant frequencies and laser wavelength, which is crucial for applications like metrology and spectroscopy.

How does spacer parallelism affect laser performance?

Poor parallelism causes misalignment between mirrors, leading to higher diffraction losses, reduced finesse, mode distortion, and potential lasing threshold increase or unstable output.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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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