Browsing Luonnontieteiden, metsätieteiden ja tekniikan tiedekunta by Author "Friberg, Ari T"
Now showing items 1-20 of 39
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Blackbody far-field coherence
(The Optical Society of America, 2020)We revisit the spectral coherence properties of far-field radiation emanating from an aperture in a blackbody cavity on the basis of Kirchhoff’s boundary conditions. We point out that the far zone cross-spectral density ...Tieteelliset aikakauslehtiartikkelit
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Coherence Poincaré sphere of partially polarized optical beams
(American Physical Society (APS), 2022)A Poincaré sphere representation of electromagnetic spectral two-point spatial coherence was recently introduced for fully polarized light beams. In this work, we employ the singular-value decomposition of the cross-spectral ...
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Coherence Poincaré sphere of partially polarized optical beams
(American Physical Society, 2022)A Poincaré sphere representation of electromagnetic spectral two-point spatial coherence was recently introduced for fully polarized light beams. In this work, we employ the singular-value decomposition of the cross-spectral ...
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Coherence Stokes Parameters in the Description of Electromagnetic Coherence
(MDPI AG, 2021)The two-point counterparts of the traditional Stokes parameters, which are called the coherence Stokes parameters, have recently been extensively used for assessing the coherence properties of random electromagnetic light ...Tieteelliset aikakauslehtiartikkelit
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Complete coherence of random, nonstationary electromagnetic fields
(The Optical Society of America, 2021)Despite a wide range of applications, the coherence theory of random, nonstationary (pulsed or otherwise) electromagnetic fields is far from complete. In this work, we show that full coherence of a nonstationary vectorial ...Tieteelliset aikakauslehtiartikkelit
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Effect of polarimetric nonregularity on the spin of three-dimensional polarization states
(IOP Publishing, 2021)While the spin of two-dimensional polarization states admits a simple representation, its physical interpretation for three-dimensional (3D) mixed polarization states requires a more involved analysis. In this work, we ...Tieteelliset aikakauslehtiartikkelit
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Generation of arbitrary vector Bessel beams on higher-order Poincaré spheres with an all-dielectric metasurface
(American Physical Society, 2022)Vector Bessel beams may have a spatially varying polarization state combined with a Bessel-type transversal intensity profile. Such beams can carry both spin angular momentum and orbital angular momentum (OAM) and be ...
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Generation of pulse trains with nonconventional temporal correlation properties
We apply time dependent spectral phase modulation to generate pulse trains that are spectrally and temporally partially coherent in an ensemble averaged sense. We consider, in particular, quadratic spectral phase modulation ...
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Geometric phase in beating of light waves
(IOP Publishing, 2019)Beating is a simple physical phenomenon known for long in the context of sound waves but remained surprisingly unexplored for light waves. When two monochromatic optical beams of different frequencies and states of ...Tieteelliset aikakauslehtiartikkelit
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Ghost polarimetry using Stokes correlations
(The Optical Society of America, 2020)We present here a novel ghost polarimeter based on Stokes parameter correlations and a spatially incoherent classical source with adjustable polarization state and Gaussian statistics. The setup enables extracting the four ...Tieteelliset aikakauslehtiartikkelit
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Intensity and spin anisotropy of three-dimensional polarization states
(The Optical Society of America, 2019)Anisotropy is a natural feature of polarization states, and only fully random three-dimensional (3D) states exhibit complete isotropy. In general, differences between the strengths of the electric field components along ...Tieteelliset aikakauslehtiartikkelit
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Interferometry and coherence of nonstationary light
(The Optical Society of America, 2019)We consider temporally integrating interferometric measurements and their relation to the coherence properties of nonstationary light. We find that performing such experiments as a function of time delay is equivalent to ...Tieteelliset aikakauslehtiartikkelit
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Measurement of the Pancharatnam-Berry phase in two-beam interference
(The Optical Society of America, 2020)Young’s dual-pinhole interference experiment with arbitrary fully correlated and polarized vector light fields leads to a Pancharatnam–Berry geometric phase that is related to the associated dynamical phase. We demonstrate ...Tieteelliset aikakauslehtiartikkelit
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Mirror-based scanning wavefront-folding interferometer for coherence measurements
(The Optical Society of America, 2020)We demonstrate a modification to the traditional prism-based wavefront-folding interferometer that allows the measurement of spatial and temporal coherence, free of distortions and diffraction caused by the prism corners. ...Tieteelliset aikakauslehtiartikkelit
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Nonparaxial, quasihomogeneous electromagnetic sources and their wide-angle far fields
(Elsevier BV, 2018)We consider random, three-component, planar, quasihomogeneous electromagnetic sources and the nonparaxial far fields which they produce. We show that by measuring the far-field spectral polarization matrix on a spherical ...Tieteelliset aikakauslehtiartikkelit
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Nonregularity of three-dimensional polarization states
(The Optical Society, 2018)Regular states of polarization are defined as those that can be decomposed into a pure state (fully polarized), a two-dimensional (2D) unpolarized state (a state whose polarization ellipse evolves fully randomly in a fixed ...Tieteelliset aikakauslehtiartikkelit
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Pancharatnam-Berry phase in electromagnetic double-pinhole interference
(American Physical Society (APS), 2019)Young's two-beam interference and the Pancharatnam-Berry geometric phase constitute two landmark results in optical physics. Employing the spectral interference law of electromagnetic waves, we establish a general expression ...Tieteelliset aikakauslehtiartikkelit
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Partial spectral and temporal coherence of plane-wave pulse trains in second-harmonic generation
We study the spectral and temporal coherence effects in the passage of a Gaussian Schell-model (GSM) scalar, plane-wave pulse train through a slab of nonlinear optical crystal exhibiting second-harmonic generation. We show ...
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Poincaré sphere of electromagnetic spatial coherence
(The Optical Society of America, 2021)We introduce a Poincaré sphere construction for geometrical representation of the state of two-point spatial coherence in random electromagnetic (vectorial) beams. To this end, a novel descriptor of coherence is invoked, ...Tieteelliset aikakauslehtiartikkelit
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Polarimetric dimension and nonregularity of tightly focused light beams
(American Physical Society (APS), 2020)Polarimetric dimension and nonregularity are newly introduced concepts that characterize three-dimensional (3D) polarization states of light. We analyze the spectral polarimetric dimension and the degree of nonregularity ...Tieteelliset aikakauslehtiartikkelit
