| Pseudonondiffracting slitlike beam and its analogy to the pseudo nondispersing pulse,” Opt (1995) | |||||||||||||||
Abstract | |||||||||||||||
| A new nonspreading beam is proposed for the case in which diffraction occurs only in one transverse coordinate. The beam has the shape of a pulse in one dimension and is constant in the other (slitlike shape). The intensity of the pulse’s peak remains almost constant along a finite interval on the propagation axis. The proposed beam is analyzed and demonstrated experimentally. The analogy between this beam and the temporal pulse in a dispersive medium is discussed. The analogy between temporal pulse propagation in a dispersive medium and spatial Fresnel diffraction has recently yielded new methods to process short pulses. 1–4 One diffraction phenomenon that has not been imitated in the time domain is the so-called nondiffracting beam. 5 The original nondiffracting beam, also called the Bessel beam, is a solution, of the form E�r, z � � exp�jbz�J 0�ar�, to the free-space scalar wave equation in which a 2 1b 2 �k 2, kis the wave number, J0 is the zero-order Bessel function, | |||||||||||||||
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