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Partially coherent beam generation with metasurfaces

Photonics Research 2023年第9期11卷 1535-1541页

作者： ROMAN CALPE ATRI HALDER MEILAN LUO matias koivurova JARI TURUNEN Center for Photonics Sciences University of Eastern FinlandFI-80101 JoensuuFinland Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal UniversityChangsha 410081China Tampere Institute for Advanced Study Tampere University33100 TampereFinland Faculty of Engineering and Natural Sciences Tampere UniversityFI-33720 TampereFinland

An optical system for the generation of partially coherent beams with genuine cross-spectral density functions from spatially modulated globally incoherent sources is *** spatial intensity modulation of the incoherent source is achieved by quasi-planar metasurfaces based on spatial-frequency modulation of binary Bragg surface-relief diffraction *** types of beams are demonstrated experimentally:(i)azimuthally periodic,radially quasi-periodic beams and(ii)rotationally symmetric Bessel-correlated beams with annular far-zone radiation patterns.

关键词： coherent periodic quasi

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Coherence of bulk-generated supercontinuum

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Photonics Research 2019年第11期7卷 1345-1353页

作者： Atri Halder Vytautas Jukna matias koivurova Audrius Dubietis Jari Turunen Department of Physics and Mathematics University of Eastern FinlandFl-80101 JoensuuFinland Laser Research Center Vilnius UniversityLT-10223 VilniusLithuania Photonics Laboratory Physics UnitTampere UniversityFl-33101 TampereFinland

We have developed a numerical framework that allows estimation of coherence in spatiotemporal and spatiospectral domains. Correlation properties of supercontinuum(SC) pulses generated in a bulk medium are investigated by means of second-order coherence theory of non-stationary fields. The analysis is based on simulations of individual space–time and space–frequency realizations of pulses emerging from a 5 mm thick sapphire plate,in the regimes of normal, zero, and anomalous group velocity dispersion. The temporal and spectral coherence properties are analyzed in the near field(as a function of spatial position at the exit plane of the nonlinear medium) and as a function of propagation direction(spatial frequency) in the far field. Unlike in fiber-generated SC, the bulk case features spectacularly high degrees of temporal and spectral coherence in both the spatial and spatial-frequency domains, with increasing degrees of coherence at higher pump energies. When operating near the SC generation threshold, the overall degrees of temporal and spectral coherence exhibit an axial dip in the spatial domain, whereas in the far field, the degree of coherence is highest around the optical axis.

关键词： pump sapphire fiber

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Foreword

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Advances in Polar Science 2016年第2期27卷 I0002-I0002页

作者： Timo koivurova Embla Eir Oddsdottir Huigen Yang Jian Yang Xia Zhang APS

The concept and practice of sustainable development as a guiding institutional principle, as a concrete policy goal, and as a focus of political mobilization remain salient in meeting the multiple challenges in the Arctic. How sustainable development is conceptualized and practiced depends very much on how it is embraced by scholars, policy makers and the people in the Arctic. Under the circumstances of climate change and political-economic globalization taking place in the Arctic,

关键词： political sustainable Arctic globalization mobilization salient Foreword circumstances institutional challenges

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