SIST EN ISO 14880-2:2025 PDF

Overview

EN ISO 14880-2:2024 - "Optics and photonics - Microlens arrays - Part 2: Test methods for wavefront aberrations" (adopted by CEN as EN ISO 14880-2:2024) specifies standardized laboratory methods to measure wavefront aberrations of microlenses in microlens arrays. Applicable to very small lenses formed on or within one or more surfaces of a common substrate, the standard defines measurement arrangements, apparatus requirements, procedures, evaluation rules, uncertainty assessment and test-report content for quality and conformity testing.

Key topics and technical requirements

• Scope and terminology: Uses terms from ISO 14880-1 (vocabulary) and gives symbols such as Φ (wavefront aberration), P‑V (peak‑to‑valley), rms, λ (wavelength), NA (numerical aperture) and Θ (acceptance angle).
• Apparatus: Typical test systems include a stable optical radiation source, collimation optics, aperture limiting, sample holder, imaging optics, image sensor and interference analysis equipment.
• Source quality: Incident wavefront on the test equipment shall have an rms deviation ≤ λ/20 over the effective microlens aperture (wavelength λ of the test source).
• Measurement arrangements: Separate arrangements are described for single microlenses and full microlens arrays, plus guidance on geometrical alignment and sample preparation.
• Test methods: Informative annexes describe specific implementations:
  • Mach–Zehnder and Twyman–Green interferometer methods
  • Lateral shearing interferometer methods
  • Shack–Hartmann sensor method
  • Procedures for array uniformity measurement
• Evaluation and reporting: Procedures for calculating P‑V and rms wavefront values, uncertainty of measurement, and required information in the test report are specified.

Applications and who should use it

• Practical uses:
  • Quality control and production testing of microlens arrays
  • R&D characterization of microlens shape and optical performance
  • Acceptance testing for components in imaging devices, 3D displays, coupling optics, and arrayed light sources/detectors
• Intended users:
  • Optical engineers and metrology laboratories
  • Manufacturers of microlens arrays and integrated photonic modules
  • Test houses performing interferometric and Shack‑Hartmann measurements
  • Standards and compliance professionals in optics and photonics

Related standards

• ISO 14880-1 - Microlens arrays: Vocabulary
• ISO 14880-3 / ISO 14880-4 - Other characteristic tests (shape, dimensional parameters)
• ISO/TR 14880-5 - Guidance on method selection
• ISO 14999-4:2015 - Reference for rms calculation methods

Keywords: microlens arrays, wavefront aberrations, microlens testing, interferometer, Shack‑Hartmann, optical testing standard, EN ISO 14880-2.