The quantum candela: a re-definition of the standard units for optical radiation

被引：63

作者：

Cheung, J. Y. ^{[1
]}

Chunnilall, C. J. ^{[1
]}

Woolliams, E. R. ^{[1
]}

Fox, N. P. ^{[1
]}

Mountford, J. R. ^{[1
]}

Wang, J. ^{[1
]}

Thomas, P. J. ^{[1
]}

机构：

[1] Natl Phys Lab, Teddington TW11 0LW, Middx, England

来源：

JOURNAL OF MODERN OPTICS | 2007年 / 54卷 / 2-3期

关键词：

D O I：

10.1080/09500340600769521

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The candela, the S1 (systeme internationale) unit for optical radiation, has been one of the base units since the inception of the system. The latest definition was in 1979, when it was linked to the derived unit, the watt. Advances in optical technology and the needs of the communication sector suggest that it is timely that consideration be given to redefining the candela in terms of fundamental quantum optical entities, i.e. photons. Validation of this approach will require comparison against the most accurate conventional technique, cryogenic radiometry. A definition in terms of photon number and the requirements for demonstrating equivalence with existing techniques is discussed, together with new possibilities which would result from further improvements in accuracy. Work being carried Out at the National Physical Laboratory (NPL) towards these goals is described, drawing on developments of photon-counting calibration techniques and low temperature measurements, and research into single photon sources and detectors.

引用

页码：373 / 396

页数：24

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