Changes in the spectral degree of coherence and spectral intensity of spatially and spectrally partially coherent cosh-Gaussian pulsed beams in free space

2009 ◽  
Vol 98 (2-3) ◽  
pp. 549-556 ◽  
Author(s):  
D. Liu ◽  
C. Ding ◽  
B. Lü
Keyword(s):  
Free Space ◽  
Spectral Intensity ◽  
Partially Coherent ◽  
Degree Of Coherence ◽  
Spectral Degree

scholarly journals Controlling the Spatial Coherence of an Optical Source Using a Spatial Filter

2018 ◽  
Vol 8 (9) ◽  
pp. 1465 ◽  
Author(s):  
Milo Hyde
Keyword(s):  
Optical Communications ◽  
Free Space ◽  
Spatial Coherence ◽  
Spatial Filter ◽  
Closed Form Expression ◽  
Free Space Optical ◽  
Filter Function ◽  
Degree Of Coherence ◽  
Spectral Degree ◽  
Directed Energy

This paper presents the theory for controlling the spectral degree of coherence via spatial filtering. Starting with a quasi-homogeneous partially coherent source, the cross-spectral density function of the field at the output of the spatial filter is found by applying Fourier and statistical optics theory. The key relation obtained from this analysis is a closed-form expression for the filter function in terms of the desired output spectral degree of coherence. This theory is verified with Monte Carlo wave-optics simulations of spatial coherence control and beam shaping for potential use in free-space optical communications and directed energy applications. The simulated results are found to be in good agreement with the developed theory. The technique presented in this paper will be useful in applications where coherence control is advantageous, e.g., directed energy, free-space optical communications, remote sensing, medicine, and manufacturing.

Nonparaxial properties of partially coherent Lorentz-Gauss vortex beam propagating in free space

Optik ◽  
2018 ◽  
Vol 165 ◽  
pp. 148-158 ◽  
Author(s):  
Yan Yin ◽  
Dajun Liu ◽  
Yaochuan Wang
Keyword(s):  
Free Space ◽  
Vortex Beam ◽  
Partially Coherent

scholarly journals Suppression of intensity fluctuations in free space high-speed optical communication based on spectral encoding of a partially coherent beam

2007 ◽  
Vol 280 (2) ◽  
pp. 264-270 ◽  
Author(s):  
Gennady P. Berman ◽  
Alan R. Bishop ◽  
Boris M. Chernobrod ◽  
Dinh C. Nguyen ◽  
Vyacheslav N. Gorshkov
Keyword(s):  
Optical Communication ◽  
Free Space ◽  
High Speed ◽  
Coherent Beam ◽  
Partially Coherent ◽  
Spectral Encoding ◽  
Intensity Fluctuations

scholarly journals Nonparaxial Propagation Properties of Specially Correlated Radially Polarized Beams in Free Space

2019 ◽  
Vol 9 (5) ◽  
pp. 997
Author(s):  
Lina Guo ◽  
Li Chen ◽  
Rong Lin ◽  
Minghui Zhang ◽  
Yiming Dong ◽  
...  
Keyword(s):  
Free Space ◽  
Degree Of Polarization ◽  
Average Intensity ◽  
Polarized Beams ◽  
Diffraction Integral ◽  
Spectral Density Matrix ◽  
Potential Applications ◽  
Spectral Degree ◽  
Propagation Properties ◽  
Radially Polarized

A specially correlated radially polarized (SCRP) beam with unusual physical properties on propagation in the paraxial regime was introduced and generated recently. In this paper, we extend the paraxial propagation of an SCRP beam to the nonparaxial regime. The closed-form 3 × 3 cross-spectral density matrix of a nonparaxial SCRP beam propagating in free space is derived with the aid of the generalized Rayleigh–Sommerfeld diffraction integral. The statistical properties, such as average intensity, degree of polarization, and spectral degree of coherence, are studied comparatively for the nonparaxial SCRP beam and the partially coherent radially polarized (PCRP) beam with a conventional Gaussian–Schell-model correlation function. It is found that the nonparaxial properties of an SCRP beam are strikingly different from those of a PCRP beam. These nonparaxial properties are closely related to the correlation functions and the beam waist width. Our results may find potential applications in beam shaping and optical trapping in nonparaxial systems.

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