Arago Spot - Experimental Aspects - Intensity and Size

Intensity and Size

For an ideal point source the intensity of the Arago spot equals that of the undisturbed wave front. Only the width of the Arago spot intensity peak depends on the distances between source, circular object and screen, as well as the source's wavelength and the diameter of the circular object. This is clear from the simulation images above. This means that one can compensate for a reduction in the source's wavelength by increasing the distance l between circular object and screen or reducing the circular object's diameter.

The lateral intensity distribution on the screen has in fact the shape of a squared zeroth Bessel function of the first kind when close to the optical axis and using a plane wave source (point source at infinity):

U(P_1,r) propto J_0^2(frac{pi r d}{lambda b})


r is the distance of the point on the screen from the optical axis
d is the diameter of circular object
is the wavelength
b is the distance between circular object and screen

The following images show the radial intensity distribution of the simulated Arago spot images above:

The red lines in these three graphs correspond to the simulated images above, and the green lines were computed by applying the corresponding parameters to the squared Bessel function given above.

Read more about this topic:  Arago Spot, Experimental Aspects

Other articles related to "intensity, intensity and":

Light Intensity
... Several measures of light are commonly known as intensity ... table below Radiometric Photometric Angular Radiant intensity, measured in watts per steradian (W/sr) Luminous intensity, measured in lumens per steradian (lm/sr), or candela (cd) Areal Irradiance ...
Phenomenology of Saturable Absorption
... rate of excitations does not depend on the intensity Then, for the continuous-wave operation, the absorption rate (or simply absorption) is determined by intensity where is ...
Intensity - Other Uses
... Value intensity in philosophy and ethics In video luminous emittance, the luminous flux per unit area (lm/m2 or lux) Energy intensity, an economic measure of energy ...
Hurricane Elida (2002)
... into a Category 5 in two days and lasted for only six hours at that intensity before weakening ... Date Line to have reached such an intensity ... a high pressure ridge while undergoing two eyewall replacement cycles the first was around peak intensity and was completed when the hurricane moved over cooler ...

Famous quotes containing the words size and/or intensity:

    One writes of scars healed, a loose parallel to the pathology of the skin, but there is no such thing in the life of an individual. There are open wounds, shrunk sometimes to the size of a pin-prick but wounds still. The marks of suffering are more comparable to the loss of a finger, or the sight of an eye. We may not miss them, either, for one minute in a year, but if we should there is nothing to be done about it.
    F. Scott Fitzgerald (1896–1940)

    Murder is born of love, and love attains the greatest intensity in murder.
    Octave Mirbeau (1850–1917)