High-order nonuniformly correlated beams

Pseudo-Schell model sources

“…Similar sharpening of the beam profile have been already described for some partially coherent sources with non shift invariant coherence characteristics [6,9,44].…”

“…In both cases, the physical meaning of the above expansion is that a partially coherent source can be thought of as the superposition of a set of mutually uncorrelated, perfectly coherent, and suitably weighted fields. Of course, this also represents a way to physically synthesize partially coherent source [19,22,23,26,40,63], especially when they are not of the Schell-model type [6,44,45]. The superposition usually involves an infinite number of coherent fields but for practical applications a finite number is often enough for a good representation of the CSD function [27,44].…”

“…Among them, Gaussian Schell-model (GSM) sources, where both the spectral degree of coherence and the irradiance profile are Gaussianly shaped [1,24], have been extensively studied and characterized [25][26][27][28][29][30][31][32]. Since the publication of the superposition rule [33,34], that have eased the design of physically realizable CSD's, different kind of sources, of the Schell-model type [20,21,35,36] or not [6,[37][38][39][40][41][42][43][44][45] have been proposed.…”

Besinc Pseudo-Schell Model Sources with Circular Coherence

“…This effect is more and more evident for lower and lower ratios between the coherence parameter and the beam width. Similar behaviors have been described for other partially coherent beams with nonconventional correlation functions [11,17,20,40,41] These features could be useful for particle trapping, due to the high intensity gradient that can be obtained along transverse and radial directions on focusing the beam generated by this kind of sources. An example has been developed showing the trapping capabilities of these kinds of beams for nanoparticles presenting a refractive index either higher or lower than the surrounding medium.…”

“…Nonetheless, recent advances in different fields require new source models with specific properties to be provided. In this sense, the control of the coherence properties of the source allows to obtain beams with peculiar behaviour of their intensity in propagation [8,[11][12][13][14][15][16][17][18][19][20][21][22][23].…”