Noniterative spatially partially coherent diffractive imaging using pinhole array mask

Lu, Xingyuan; Shao, Yijia; Chen, Zhao; Konijnenberg, Sander; Zhu, Xinlei; Tang, Ying; Cai, Yangjian; Urbach, H. P.

doi:10.1117/1.ap.1.1.016005

Cited by 40 publications

(9 citation statements)

References 37 publications

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“…To verify the CSD distribution and measure the coherence singularities of the PC-PEPV beam, the other path is transmitted through the beam splitter and focused onto SLM 2 . The phase written into SLM 2 is shown in Figure 3B, containing a central square window with displacement grating, spherical wave phase for focusing, and an additional central phase perturbation [51,52]. Note that the focused input PC-PEPV beam and the center of SLM 2 need to be aligned.…”

Section: Methodsmentioning

confidence: 99%

Generation and Propagation of Partially Coherent Power-Exponent-Phase Vortex Beam

Zhang

Wang

et al. 2021

Front. Phys.

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We report on a partially coherent power-exponent-phase vortex beam (PC-PEPV), whose spatial coherence is controllable and the initial phase exhibits a periodic power exponential change. The PC-PEPV beam was generated experimentally with various spatial coherence widths, and its propagation properties were studied both numerically and experimentally. By modulating the topological charge (TC) and power order of the PC-PEPV beam, the structure of the vortex beam can be adjusted from circular to elliptic, triangular, quadrangle, and pentagon. When the power order is odd, the PC-PEPV beam with a negative TC can be generated, and the profiles of the PC-PEPV beam can be precisely controlled via adjusting the value of the power order. For the case of high spatial coherence width, the number of the dark cores in the polygonal intensity array of the PC-PEPV beam equals the magnitude of the TC. However, when decreasing the spatial coherence width, the dark cores vanish and the intensity gradually transforms into a polygonal light spot. Fortunately, from the modulus and phase distributions of the cross-spectral density (CSD), both the magnitude and sign of the TC can be determined. In the experiment, the modulus and phase distribution of the CSD are verified by the phase perturbation method. This study has potential applications in beam shaping, micro-particle trapping, and optical tweezers.

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Section: Methodsmentioning

confidence: 99%

Generation and Propagation of Partially Coherent Power-Exponent-Phase Vortex Beam

Zhang

Wang

et al. 2021

Front. Phys.

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“…The spatial coherence structure engineering at the source has been shown to endow optical fields with a number of nontrivial features, such as diffraction-free propagation [9,24], efficient self-healing [28,29], self-focusing [20,30,31], self-steering [32,33], and self-shaping [34,35] capabilities as well as periodicity reciprocity [36,37]. A rich repertoire of propagation scenarios induced by the spatial coherence engineering enables a host of promising applications to photovoltaics [38], diffractive imaging with low-coherence light [39], optical target tracking [40,41], and particle trapping [42,43] among others.…”

Section: Intorductionmentioning

confidence: 99%

Optical Coherence Encryption with Structured Random Light

Peng¹,

Huang²,

Liu

et al. 2021

Preprint

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Information encryption with optical technologies has become increasingly important due to remarkable multidimensional capabilities of light fields. However, the optical encryption protocols proposed to date have been primarily based on the first-order field characteristics, such as the optical field amplitude and phase as well as its polarization. As the said first-order characteristics of light fields are strongly affected by interference effects, the conventional encoding protocols become quite unstable during light propagation and interaction with the matter. Here, we introduce an alternative optical encryption protocol whereby the information is encoded into the spatial coherence distribution of a structured random light beam via a generalized van Cittert--Zernike theorem. We show that the proposed approach has two key advantages over its conventional counterparts. First, the complexity of measuring the spatial coherence distribution of light enhances the encryption protocol security. Second, the relative insensitivity of the second-order statistical characteristics of light to environmental noise makes the protocol robust against the environmental fluctuations, e.g, the atmospheric turbulence. We carry out experiments to demonstrate the feasibility of the coherence-based encryption method with the aid of a fractional Fourier transform. Our results open up a promising avenue for further research into optical encryption in complex environments.

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“…The spatial coherence structure engineering at the source has been shown to endow optical fields with a number of nontrivial features, such as diffraction-free propagation [ 9 , 24 ], efficient self-healing [ 28 , 29 ], self-focusing [ 20 , 30 , 31 ], self-steering [ 32 , 33 ], and self-shaping [ 34 , 35 ] capabilities as well as periodicity reciprocity [ 36 , 37 ]. A rich repertoire of propagation scenarios induced by the spatial coherence engineering enables a host of promising applications to photovoltaics [ 38 ], diffractive imaging with low-coherence light [ 39 ], optical target tracking [ 40 , 41 ], and particle trapping [ 42 , 43 ] among others.…”

Section: Introductionmentioning

confidence: 99%

Optical coherence encryption with structured random light

et al. 2021

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View full text Add to dashboard Cite

Information encryption with optical technologies has become increasingly important due to remarkable multidimensional capabilities of light fields. However, the optical encryption protocols proposed to date have been primarily based on the first-order field characteristics, which are strongly affected by interference effects and make the systems become quite unstable during light–matter interaction. Here, we introduce an alternative optical encryption protocol whereby the information is encoded into the second-order spatial coherence distribution of a structured random light beam via a generalized van Cittert–Zernike theorem. We show that the proposed approach has two key advantages over its conventional counterparts. First, the complexity of measuring the spatial coherence distribution of light enhances the encryption protocol security. Second, the relative insensitivity of the second-order statistical characteristics of light to environmental noise makes the protocol robust against the environmental fluctuations, e.g, the atmospheric turbulence. We carry out experiments to demonstrate the feasibility of the coherence-based encryption method with the aid of a fractional Fourier transform. Our results open up a promising avenue for further research into optical encryption in complex environments.

show abstract

Noniterative spatially partially coherent diffractive imaging using pinhole array mask

Cited by 40 publications

References 37 publications

Generation and Propagation of Partially Coherent Power-Exponent-Phase Vortex Beam

Generation and Propagation of Partially Coherent Power-Exponent-Phase Vortex Beam

Optical Coherence Encryption with Structured Random Light

Optical coherence encryption with structured random light

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