Primary standard of optical power operating at room temperature

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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.

Details

Original languageEnglish
Title of host publication16th International Congress of Metrology
EditorsJ. R Filtz
Publication statusPublished - 2014
MoE publication typeA4 Article in a conference publication
EventInternational Congress of Metrology - Paris, France
Duration: 7 Oct 201310 Oct 2013
Conference number: 16

Publication series

NameEPJ Web of Conferences
PublisherEDP Sciences
Volume77
ISSN (Electronic)2100-014X

Conference

ConferenceInternational Congress of Metrology
CountryFrance
CityParis
Period07/10/201310/10/2013

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