Traceable absorption measurements of wavelengths at the NMI of Radiometry and Time & Frequency

Purpose and goal

The aim and objective of the project is to design a useful, cost-effective, robust and stable precision method for traceable absorption measurements of wavelengths to meet future needs in sensor systems, tunable lasers, optical spectrum analyzers, tunable filter applications, wavelength and frequency locks and systems for chemical detection. An intermediate goal is to support Swedish research in spectroscopy and component development.

Expected results and effects

The following objective have been fully achieved or partially achieved during the project. Construction of an experimental setup that enables traceable measurements of absorption wavelengths of an arbitrary gas, with traceability to the realization of 1s, or to Cs, which is assumed to be one of the new SI units. Collaboration with Chalmers doctoral student Complete and verify the robust optical cam Made an extra laser cavity for the comb for educational purposes Develop the locking to the external laser used to illuminate the cell Production of reference

Planned approach and implementation

The project was planned with three major work packages Complete and verify the robust optical cam Develop the locking of an external laser used for illumination of the cell. Traceability calculations, Measurement uncertainty calculations, Programming of control units, Development of reference packs came to contribute to each other´s implementation. Much has been done with some deviations due to Covid-19 which has caused disruptions for external suppliers who have not been able to deliver within the project time.