Long-term spectral responsivity stability of predictable quantum efficient detectors

G. Porrovecchio*, U. Linke, M. Smid, J. Gran, E. Ikonen, L. Werner

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)
26 Downloads (Pure)


The stability of induced junction silicon photodiodes used to construct the predictable quantum efficient detector (PQED) has been studied over a time period of a decade by measurements of its spectral responsivity against absolute cryogenic radiometers (CR) in two independent laboratories at CMI and PTB. PQEDs operated at room temperature show a long-term temporal stability within 150 ppm over a broad spectral range during a 10-year period, well within the range of the claimed measurement uncertainty values of the CRs. This long term stability fulfills one of the fundamental requirements to establish a new primary standard for the measurement of power of optical radiation.

Original languageEnglish
Article number065008
Number of pages6
Issue number6
Publication statusPublished - 1 Dec 2022
MoE publication typeA1 Journal article-refereed


  • photometry
  • predictable quantum efficient detector
  • radiometry


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