They are brought to a focus by a second lens ( bottom ) where an interference pattern is observed to determine the optical path difference in terms of wavelengths of the light.
12.
If phase is plotted versus wavenumber, the slope of the function corresponds to the relative change in group-velocity optical path difference D G by D h = D G / 2n G where n G is group-velocity index of refraction.
13.
The two beams meet at the plane of the third crystal ( A ), which is sometimes called, the analyzer crystal, and create an interference pattern the form of which depends on the optical path difference between the two beams caused by the sample.
14.
In this application, an incoming differential phase-shift keying ( DPSK ) optical signal is first split into two equal-intensity beams in two arms of a Mach Zehnder or Michelson interferometer, in which one beam is delayed by an optical path difference corresponding to " 1-bit " time delay.
15.
Adding an adjustable offset phase determining the interference at zero optical path difference in the sample, the contrast is proportional to the path length gradient along the shear direction, giving the appearance of a three-dimensional physical relief corresponding to the variation of optical density of the sample, emphasising lines and edges though not providing a topographically accurate image.
16.
A high refractive index layer of the light reflected from its phase does not shift, The reflected light of the low refractive index layer whose phase is shifted by 180 degrees, Reflected several times through the interface of each film and the linear superposition of the transmitted light, when the optical wavelength of the optical path difference is equal to, or the same phase, multiple transmitted light will interfere with phase strengthened, to form a strong transmitted lightwaveinverting lightwave offset each other.
17.
Conrady's teaching proved seminal, since he was able to take the arcane and rather disorganized discipline of optical design and establish it on a systematic, didactic basis, applying many of his newly devised procedures and theoretical insights, " e . g . ", the doctrine of the " optical path length " ( " OPL " ) and " optical path difference " ( " OPD " ), which he had published during the period from 1904 to 1920.
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