optical path length

The optical path length from the light source is used to compute the phase.

Considering the above numbers a single mirror can compensate 4 m optical path length.

Since the beam is no longer traveling the full optical path length to the floor, its reflected angle changes.

In radio astronomy the air mass (which influences the optical path length) is not relevant.

The difference in optical path length between the two arms to the interferometer is known as the retardation.

For fine-tuning one can also change the optical path length of the resonator.

Also the difference in optical path length through each of the two objective lenses is carefully aligned to be minimal.

If the optical path length variations are more than a wavelength the image will contain fringes.

These inhomogeneities are localized differences in optical path length that cause light deviation.

The expression for the optical path length can also be written as a function of the optical momentum.

The optical path length is constant between wavefronts.

They will experience different optical path lengths where the areas differ in refractive index or thickness.

In astronomy, air mass (or airmass) is the optical path length through Earth's atmosphere for light from a celestial source.

The difference in optical path length for rays r and r is given by:

For certain wavelengths, however, the optical path length difference is an integer multiple of the wavelength, so that the losses are very small.

The optical path length is a purely geometrical quantity since time is not considered in its calculation.

This in turn shifts the band edge and changes the optical path length in the lasing cavity.

The variation of the optical path length causes fluctuations of the back-reflected phase signal.

The optical path length of a ray from a point A to a point B is defined by:

The Gladstone-Dale term (n 1) is the non-linear optical path length or time delay.

SMS optics are also calculated by applying a constant optical path length between wavefronts.

The result is that light traveling an equal optical path length in the test and reference beams produces a white light fringe of constructive interference.

As this calculation demonstrates, Snell's law is equivalent to vanishing of the first variation of the optical path length.

Time-resolved responses are found by keeping track of the total elapsed time of the photon's flight using the optical path length.

It can also be used to detect optical path length variations in transparent media, which enables, for example, fluid flow to be visualised and analysed.