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IEVref:705-02-14ID:
Language:enStatus: Standard
Term: optical path length
Synonym1: phase path length
[Preferred]
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Definition: length of the path that would be travelled at the speed of light in vacuum in a duration equal to the phase delay of a given electromagnetic wave between two given points

Note 1 to entry: Between two points in the same ray path, the optical path length equals the line integral of the refractive index along the ray path:

c nds MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdi9qqqj=hEeeu0lXdbba9frFj0xb9Lqpepeea0xd9s8qiYRWxGi6xij=hbba9q8aq0=yq=He9q8qiLsFr0=vr0=vr0db8meWabaGacmGadiWaaiWabaabaiaafaaakeaadaWdrbqaaiaad6gaciGGKbGaam4CaaWcbaGaci4yaaqab0Gaey4kIipaaaa@3F96@

where n is the refractive index of the medium at each point in the direction of the path and ds the curve element along the path.


Publication date:2020-04
Source:
Replaces:705-02-14:1995-09
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