Overview
EN ISO 13695:2024 - "Optics and photonics - Lasers and laser-related equipment - Test methods for the spectral characteristics of lasers" - provides standardized methods to measure the spectral characteristics of lasers, including wavelength, bandwidth (linewidth), spectral distribution, and wavelength stability. Applicable to both continuous wave (cw) and pulsed lasers, the standard supports traceable, reproducible measurements and reporting across manufacturing, testing and research environments. EN ISO 13695:2024 supersedes the 2004 edition and is adopted by CEN members.
Key topics and requirements
- Defined spectral parameters: clear terminology and symbols for wavelength in vacuum, bandwidth, spectral distribution and stability (aligned with ISO 11145 and VIM).
- Measurement classes: guidance for low, medium and high accuracy measurements to match application-dependent uncertainty requirements.
- Equipment selection and methods: practical criteria for choosing instruments such as grating spectrometers/monochromators, interferometers (including Fabry–Pérot) and photoelectric mixing methods. Annexes provide selection and calibration guidance.
- Measurement procedures: stepwise approaches for measurements in air, low-resolution and high-resolution regimes, including preliminary tests and analysis methods.
- Wavelength stability: procedures to assess how spectral characteristics change with operating conditions and to quantify single-frequency laser stability.
- Traceability and reporting: emphasis on measurement traceability, uncertainty assessment and standardized test reports to ensure consistent data exchange.
- Informative annexes: refractive index of air, calibration and selection criteria for monochromators and Fabry–Pérot interferometers.
Applications and users
EN ISO 13695:2024 is essential for:
- Laser manufacturers and component suppliers producing laser modules and optical sources.
- Calibration and testing laboratories performing traceable spectral measurements.
- OEMs and systems integrators in photonics, telecommunications, medical devices, lithography, interferometry and manufacturing.
- R&D teams developing laser systems where wavelength and linewidth affect performance.
- Quality and compliance engineers preparing datasheets, acceptance tests and conformity evidence.
Practical uses include product specification verification, production quality control, performance characterization for interferometry and lithography, and establishing calibration services with documented measurement uncertainty.
Related standards
- ISO 11145 (Optics and photonics - Vocabulary and symbols)
- ISO/IEC Guide 99 (VIM - metrology vocabulary)
- IEC 60747-5-1 (Optoelectronic devices)
Keywords: EN ISO 13695:2024, spectral characteristics, laser wavelength, bandwidth, wavelength stability, cw and pulsed lasers, grating spectrometer, Fabry–Pérot, measurement uncertainty, traceability, laser testing.
