Issues

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1987

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August

  

New instruments and measurement methods


The prospects of quantum photometry

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Lomonosov Moscow State University, Department of Physics, Leninskie Gory 1 build. 2, Moscow, 119991, Russian Federation

A review is presented of two original methods of calibrating sources and detectors of optical radiation. Their main feature is that they are absolute, i.e., no calibrated devices are employed. Readings are taken in dimensionless units, i.e., number of pulses per photon, when detectors are calibrated, and number of photons per field mode, when sources are calibrated. A new name is proposed for the latter quantity, namely, the planck, since it is a natural quantum unit of the basic photometric variable, i.e., spectral radiance of radiation. Both methods are based on a nonlinear-optics effect, namely, parametric scattering of light, observed in birefringent piezoelectric crystals such as lithium niobate. The necessary data on this effect are presented together with the theoretical bases of the methods and the results of experimental investigations and comparisons with traditional methods.

PACS: 07.60.Dq, 06.20.fb, 85.60.Gz, 85.60.Ha (all)
DOI: 10.1070/PU1987v030n08ABEH002939
URL: https://ufn.ru/en/articles/1987/8/e/
Citation: Klyshko D N, Penin A N "The prospects of quantum photometry" Sov. Phys. Usp. 30 716–723 (1987)
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Оригинал: Клышко Д Н, Пенин А Н «Перспективы квантовой фотометрии» УФН 152 653–665 (1987); DOI: 10.3367/UFNr.0152.198708e.0653

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