Abstract
We have validated optical power measurements with a Predictable Quantum Efficient Detector (PQED) at liquid nitrogen temperature (77 K) at low optical power from 130 fW to 3.3 pW. Two laser wavelengths at 514 nm and 785 nm were used. The lowest measured optical power corresponds to a photon flux of 0.5·106 photons per second (785 nm). The PQED’s responsivity is linear within the relative measurement uncertainties of 8% at 0.5·106 ph/s and 1.4% at 10·106 ph/s (95% confidence level), which enables the calibration of other low photon flux detectors directly against a primary standard of optical power.
| Original language | English |
|---|---|
| Article number | 012005 |
| Journal | Journal of Physics: Conference Series |
| Volume | 2864 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2024 |
| MoE publication type | A4 Article in a conference publication |
| Event | 15th International Conference on New Developments and Applications in Optical Radiometry, NEWRAD 2023 - Teddington, United Kingdom Duration: 11 Sept 2023 → 15 Sept 2023 |
Funding
This work was funded by the project SEQUME (contract 20FUN05) of the European Metrology Programme for Innovation and Research (EMPIR). The EMPIR is jointly funded by the EMPIR participating countries within EURAMET and the European Union\u2019s Horizon 2020 Programme. The work is part of the Research Council of Finland Flagship Programme, Photonics Research and Innovation (PREIN), decision number 346529, Aalto University.