Spatial coherence measurement and partially coherent diffractive imaging using self-referencing holography

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

doi:10.1364/oe.26.004479

Cited by 30 publications

(13 citation statements)

References 28 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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“…Each singleparticle interference image therefore represents the in-line hologram of the corresponding scattering particle. The self-referencing scheme is strongly reminiscent of in-line Gabor holography [84,[89][90][91], originally proposed as a way to improve the resolution of the Transmission Electron Microscope (TEM) [92] and nowadays largely exploited in the visible range with laser light [93][94][95][96] or in the X-ray domain with coherent FEL beams [97][98][99][100][101][102][103][104]. The same self-referencing scheme is also at the basis of the Point Diffraction Interferometer (PDI) used in the X-ray community for phase-contrast imaging and wavefront characterization [99,[105][106][107][108][109].…”

Section: On the Origin Of Heterodyne Specklesmentioning

confidence: 99%

Heterodyne Near Field Speckles: from laser light to X-rays

Siano

Paroli

Potenza

2021

Advances in Physics: X

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“…The corresponding correlation function can be measured with the help of self-referencing holography, as mentioned in Ref. [47], in which the correlation function of the illumination source can be retrieved. Figure 10 shows our experimental results in relation to the intensity of a focused HGCSMLG 0l beam at different distances for different beam orders m, n with l = 2.…”

Section: Experimental Verificationmentioning

confidence: 99%

“…The corresponding correlation function can be measured with the help of self-referencing holography, as mentioned in Ref. [47], in which the correlation function of the illumination source can be retrieved. The intensity distribution morphs from a donut shape into an array form on propagation, which agrees well with Figure 3.…”

Section: Experimental Verificationmentioning

confidence: 99%

Generation and Propagation of a Hermite-Gaussian Correlated Schell-Model LG0l Beam

Liu

et al. 2019

Applied Sciences

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A partially coherent beam under the combined action of a Hermite-Gaussian correlated function and vortex phase, named the HGCSMLG0l beam has been explored both theoretically and experimentally. The statistical properties, such as the intensity and distribution of the degree of coherence (DOC) on propagation are analyzed in detail, based on the deduced equations. We find that the intensity is determined dominantly by the non-conventional correlated function when the coherence length is comparatively small and by vortex phase when the coherence length is large. The modulus of the DOC is not vulnerable to coherence width, rather, it is affected by both non-conventional correlated function and vortex phase. Our results are verified well by the experiment results.

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Spatial coherence measurement and partially coherent diffractive imaging using self-referencing holography

Cited by 30 publications

References 28 publications

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

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

Heterodyne Near Field Speckles: from laser light to X-rays

Generation and Propagation of a Hermite-Gaussian Correlated Schell-Model LG0l Beam

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