Instantaneous Speckle Structures in a Partially Coherent Optical Wave Field with Broad Frequency and Angular Spectra

Ryabukho, Vladimir P.; Максимова, Л. А.; Mysina, N. Yu.; Lyakin, D. V.; Ryabukho, P. V.

doi:10.1134/s0030400x19020218

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2019

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“…For optical fields, the field correlation between different points in the direction of its propagation has been mainly understood as temporal coherence [1]. However, depending on the divergence of the field, coherence in the longitudinal direction can be seen as the combined effect of the frequency spectrum and angular spectrum [2][3][4][5][6][7][8]. Existing studies in this direction emphasize on the role of the size of an extended source in determining longitudinal spatial coherence (LSC) [9][10][11], and use of interferometric schemes to determine LSC for scalar light fields [4,11].…”

Section: Introductionmentioning

confidence: 99%

Investigation of longitudinal spatial coherence for electromagnetic optical fields

Kanseri¹,

Arya²

2019

Opt. Express

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For light fields, the coherence in longitudinal direction is governed by both the frequency spectra and angular spectra they possess. In this work, we develop and report a theoretical formulation to demonstrate the effect of the angular spectra of electromagnetic light fields in quantifying their longitudinal spatial coherence. The experimental results obtained by measuring the electromagnetic longitudinal spatial coherence and degree of cross-polarization of uniformly polarized light fields for different angular spectra validate the theoretical findings.

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