Primary standard of optical power operating at room temperature

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

Tutkimustuotos: Artikkeli kirjassa/konferenssijulkaisussaConference article in proceedingsScientificvertaisarvioitu

126 Lataukset (Pure)


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.
Otsikko16th International Congress of Metrology
ToimittajatJ. R Filtz
KustantajaEDP Sciences
ISBN (elektroninen)9781634393287
DOI - pysyväislinkit
TilaJulkaistu - 2014
OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisussa
TapahtumaInternational Metrology Congress - Paris, Ranska
Kesto: 7 lokak. 201310 lokak. 2013
Konferenssinumero: 16


NimiEPJ Web of Conferences
KustantajaEDP Sciences
ISSN (elektroninen)2100-014X


ConferenceInternational Metrology Congress


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