Ring-shaped twisted Gaussian Schell-model array beams

Abstract

A new partially coherent source which can generate a beam field with a ring-shaped twisted array profile is presented, and the distribution characteristics of spectral density and degree of coherence of the field are discussed. It is shown that both the spectral density and degree of coherence will rotate along the propagating direction, but in opposite rotating directions. Furthermore, we find that the distribution properties of the ring-shaped array of the spectral density, including the number of the rings, the number of the lobes of each ring, and the distance of all adjacent lobes, can be properly controlled by adjusting structural parameters of the source.

Propagation characteristics of twisted cosine-Gaussian Schell-model beams

“…Recently, the possibility of furnishing random array beams with twisted factor has also been demonstrated. Different twisted partially coherent sources for producing rotating array profiles with axial symmetry or central symmetry have been introduced [31][32][33][34][35]. However, most of these twisted models are generated by mapping the twisted phase to un-twisted CSDs, leading to that they all present the same twist patterns that each element rotates about its own lobe center.…”

Evaluation of twisted Gaussian Schell model beams produced with phase randomized coherent fields

“…The sense of rotation can be defined by the handedness of the beam. Additionally, other classes of TGSM beams such as twisted Laguerre Gaussian Schell-model (TLGSM) [9], twisted Hermite GSM (THGSM) beams [10], ring-shaped twisted Gaussian Schellmodel array (RTGSMA) [11], and twisted vortex Gaussian Schell-model (TVGSM) beams [12] have been introduced and their propagation properties have been studied. Due to the unique properties of the twist phase, TGSM beams find applications in various research areas such as optical communication through atmospheric and underwater turbulence [13][14][15][16][17], in resisting coherence induced depolarization, overcoming the classical Rayleigh limit [18], to control the coherence of optical solitons [19], to boost entanglement in photon pairs [20], and in stimulated parametric down-conversion [21].…”

Properties of the Rotation and Mergence of Twisted Gaussian Schell Model Array Beams Propagating in Turbulent Biological Tissues

“…On the other hand, due to the wide applications in multiple fields such as holographic optical tweezers [17], particles trapping [18], photonic lithography [19][20][21], and various array beams have always been a subject of great concern. Compared with the single beam, the coherent array beams have source size which diverges less and can produce higher output power and lattice-like intensity distribution [22]; researchers have made lots of efforts [23][24][25][26][27][28]. Wan and Zhao [29] presented a new kind of array beams with twist phase termed as twisted Gaussian Schell model array (TGSMA) sources whose spectral density and spectral degree of coherence can gradually rotate along its propagation directions; properties of electromagnetic twisted Gaussian Schell model array beams in free space have been investigated [22]and the effect of anisotropic oceanic turbulence on propagation properties of the TGSMA beams has been reported [30,31].…”