Primary standard of optical power operating at room temperature

Timo Dönsberg, Meelis Sildoja, Farshid Manoocheri, Mikko Merimaa, Leo Petroff, Erkki Ikonen

Research output: Contribution to journalArticleScientificpeer-review

Abstract

The Predictable Quantum Efficient Detector (PQED) is evaluated as a new primary standard of optical power. Design and characterization results are presented for a new compact room temperature PQED that consists of two custom-made induced junction photodiodes mounted in a wedged trap configuration. The detector assembly includes a window aligned in Brewster angle in front of the photodiodes for high transmission of p polarized light. The detector can also be operated without the window, in which case a dry nitrogen flow system is utilized to prevent dust contamination of the photodiodes. Measurements of individual detectors at the wavelength of 488 nm indicate that reflectance and internal quantum efficiency are consistent within 14 ppm and 10 ppm (ppm = part per million), respectively, and agree with the predicted values. The measured photocurrent ratio of the two photodiodes confirms the predicted value for s and p polarized light, and the spatial variation in the photocurrent ratio can be used to estimate the uniformity in the thickness of the silicon dioxide layer on the surface of the photodiodes. In addition, the spatial non-uniformity of the responsivity of the PQED is an order of magnitude lower than that of single photodiodes. Such data provide evidence that the room temperature PQED may replace the cryogenic radiometer as a primary standard of optical power in the visible wavelength range.

Original languageEnglish
Article number00012
JournalEPJ Web of Conferences
Volume77
DOIs
Publication statusPublished - 1 Jan 2014
MoE publication typeA1 Journal article-refereed
Event16th International Congress of Metrology - Paris, France
Duration: 7 Oct 201310 Oct 2013

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Dönsberg, T., Sildoja, M., Manoocheri, F., Merimaa, M., Petroff, L., & Ikonen, E. (2014). Primary standard of optical power operating at room temperature. EPJ Web of Conferences, 77, [00012]. https://doi.org/10.1051/epjconf/20147700012