Surface contouring by phase-shifting real-time holography using photorefractive sillenite crystals

Gesualdi, Marcos R. R.; Soga, Diogo; Muramatsu, Mikiya

doi:10.1016/j.optlastec.2005.05.004

Cited by 30 publications

(27 citation statements)

References 15 publications

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“…Using the obtained microinterferograms and Equation (6) the phase maps was calculated, in the parallel and perpendicular directions as shown in Figure 4(a) and Figure 5(a). The tangent function was within the interval {−π and +π} [27]. Each phase value was represented by the grey shade intensity at each point of the image, where the black one corresponds to −π and the white is +π, while the grey shade measures the intermediate intensity values between −π and +π.…”

Section: Resultsmentioning

confidence: 99%

Opto-Mechanical Properties of PTFE Fibres Using Phase Shifting Interferometry

Yassien¹,

Bakary²

2014

OPJ

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Polytetrafluoroethylene (PTFE) is one of a class of polymer that has many unique properties, which make it valuable in scores of applications. Here, the molecular alignment effect in fibre drawing and its relation with nonlinear optical properties of the PTFE fibres were studied by means of interferometry. For this propose, the phase shifting Mach-Zehnder interferometer was utilized. The fibre drawing device was attached to the interferometer for measuring the opto-mechanical properties of PTFE fibres. From the recorded interferomgrams the wrapped phase map and its contour line were determined using the phase shifting interferometry (PSI) method. From the contour lines the refractive index, refractive index profile, birefringence, polaryzability and orientation function of the investigated sample were determined at different draw ratios. The PSI method showed good results for enhancing the noisy fringe pattern and for obtaining contour line microinterferograms. This study offers the correlation between the mechanical properties and the structure properties of fibres. Thus, a better structure-property correlation can improve the technical and industry performance of the fibres.

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Section: Resultsmentioning

confidence: 99%

Opto-Mechanical Properties of PTFE Fibres Using Phase Shifting Interferometry

Yassien¹,

Bakary²

2014

OPJ

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“…Subsequently, materials that dispensed the chemical processing emerged: the photorefractive crystals, which are used as recording medium in Photorefractive Holography [6,7]. This technique has been broadly applied in surface contouring and in phase-shifting real time interferometry [8,9,10,11,12,13,14], as well as in microscopy [15,16].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Digital Holography for recording and reconstruction of 3D images using optoelectronic devices

Yepes

Gesualdi

2017

J. Microw. Optoelectron. Electromagn. Appl.

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Abstract-In this work, we present the optical recording and reconstruction of dynamic 3D digital holograms using optoelectronic devices. Digital Holography technique allows recording and reconstruction of three-dimensional images of real objects, since a hologram presents both the intensity and phase information about the object. The experimental implementation of digital holographic systems for recording, as well as for numerical and optical reconstruction of three-dimensional objects became possible. We developed an experimental setup that allowed the optical recording (construction) of dynamic digital holograms (DHs) from real three-dimensional objects in CCD cameras, together with their numerical reconstruction and their optical reconstruction in a dynamic process by using a spatial light modulator, SLM; it was used a single holographic experimental setup in the entire process. We have obtained good results that enable excellent prospects for applications in recording and reconstruction of 3D scenes.

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“…[1][2][3][4][5] These materials are technologically important because of their photorefractive (PR) properties caused by light induced charge carrier migration and consecutive trapping by suitable defects. 6 Point defects, either intrinsic or extrinsic, play a fundamental role in the PR behavior.…”

Section: Introductionmentioning

confidence: 99%

A photosensitive Cr3+ center in photorefractive Bi12SiO20 crystals co-doped with chromium and phosphorus

Ahmad

Marinova

Vrielinck

et al. 2011

Journal of Applied Physics

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ABSTRACT:A trigonal Cr 3+ (3d 3 ) defect in sillenite type Bi 12 SiO 20 crystals co-doped with chromium and phosphorus has been identified by means of multi-frequency X-band (9.4 GHz), Q-band (35 GHz) and W-band (94 GHz) electron paramagnetic resonance (EPR). A consistent analysis of the observed spectra and their angular dependence was reached using an S=3/2 spin Hamiltonian with axial symmetry around a <111> crystallographic direction, an isotropic g-value g = 1.983, and a zero field splitting parameter B 2 0 = 0.1950 cm -1 . The spectra are attributed to a chromium ion in the unusual Cr 3+ valence replacing a substitutional Si 4+ in tetrahedral oxygen coordination. Evidence is found that the symmetry lowering from tetrahedral to trigonal is not spontaneous but induced by an associated defect, for which a P 5+ ion in a nearest-neighbor Si 4+ site is the most plausible candidate. Optical excitation results in a reversible charge transfer process directly correlated with a photochromic effect: near-UV light leads to a strong reduction of the Cr 3+ EPR signals, and induces a broad band at 675 nm in the absorption spectrum, and both effects are reversed under red light excitation.

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Surface contouring by phase-shifting real-time holography using photorefractive sillenite crystals

Cited by 30 publications

References 15 publications

Opto-Mechanical Properties of PTFE Fibres Using Phase Shifting Interferometry

Opto-Mechanical Properties of PTFE Fibres Using Phase Shifting Interferometry

Dynamic Digital Holography for recording and reconstruction of 3D images using optoelectronic devices

A photosensitive Cr3+ center in photorefractive Bi12SiO20 crystals co-doped with chromium and phosphorus

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