Measurement of an Optical Frequency and the Speed of Light

Bay, Z.; Luther, G. G.; White, J. A.

doi:10.1103/physrevlett.29.189

Cited by 75 publications

(18 citation statements)

References 8 publications

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“…This, together with the independence of the velocity of light on its frequency, impelled Bay et al [10] to suggest, instead of unit of length (meter), to use as the basic unit the unit of velocity, namely the velocity of light c. In 1983 the definition c = 299 792 458 m/s (4) was introduced in SI. The traditional standard of length gave way to the new standard based on the value of the velocity c. This velocity is defined as a number without uncertainty.…”

Section: Atomic Clocks and Cmentioning

confidence: 99%

Fundamental Units: Physics and Metrology

Okun¹

2009

Energy and Mass in Relativity Theory

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The problem of fundamental units is discussed in the context of achievements of both theoretical physics and modern metrology. On one hand, due to fascinating accuracy of atomic clocks, the traditional macroscopic standards of metrology (second, metre, kilogram) are giving way to standards based on fundamental units of nature: velocity of light c and quantum of action h. On the other hand, the poor precision of gravitational constant G, which is widely believed to define the "cube of theories" and the units of the future "theory of everything", does not allow to use G as a fundamental dimensional constant in metrology. The electromagnetic units in SI are actually based on concepts of prerelativistic classical electrodynamics such as ether, electric permitivity and magnetic permeability of vacuum. Concluding remarks are devoted to terminological confusion which accompanies the progress in basic physics and metrology.

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Section: Atomic Clocks and Cmentioning

confidence: 99%

Fundamental Units: Physics and Metrology

Okun¹

2009

Energy and Mass in Relativity Theory

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“…Their values are expected to follow from TOE. Similar to the cube is "dimensional pyramid" (Kuchar [9], Sanchez [10]) with 4 vertices and 4 planes, Fig. 4.…”

Section: C H G -Unitsmentioning

confidence: 99%

Fundamental Units: Physics and Metrology

Okun¹

2004

Astrophysics, Clocks and Fundamental Constants

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Abstract. The problem of fundamental units is discussed in the context of achievements of both theoretical physics and modern metrology. On one hand, due to fascinating accuracy of atomic clocks, the traditional macroscopic standards of metrology (second, metre, kilogram) are giving way to standards based on fundamental units of nature: velocity of light c and quantum of action h. On the other hand, the poor precision of gravitational constant G, which is widely believed to define the "cube of theories" and the units of the future "theory of everything", does not allow to use G as a fundamental dimensional constant in metrology. The electromagnetic units in SI are actually based on concepts of prerelativistic classical electrodynamics such as ether, electric permitivity and magnetic permeability of vacuum. Concluding remarks are devoted to terminological confusion which accompanies the progress in basic physics and metrology.

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“…The accuracy of such measurements is not given by the precision of the lambdameter but mostly restricted by the accuracy of the frequency of the polarization-stabilized single-mode helium-neon laser used as a reference for the lambdameter [1]. For the center frequency of the helium neon laser we took a value of 474 612 170 MHz [8]. We assumed that the two strongest modes of the polarization-stabilized reference laser were located symmetrically below the Doppler broadened line profile.…”

Section: Data Evaluationmentioning

confidence: 99%