Real-time scaling of micro-objects by multiplexed holographic recording on photo-thermoplastic structure

Chirita, A.

doi:10.1080/09500340.2010.489723

Cited by 15 publications

(10 citation statements)

References 4 publications

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“…The recording of the surface relief phase grating in PTP film includes several stages that are described in the papers [2,3]. dependence on spatial frequency for thermoplastic layer thickness 0.5 m (1) and 0.2 m (2).…”

Section: Recording In Photo-thermoplastic Carriersmentioning

confidence: 99%

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Holographic imaging and interferometry with non-Bragg diffraction orders in lithium niobate and photothermoplastic materials

2012

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We investigated recording of holographic volume and surface-relief gratings in photorefractive crystal and in a photo-thermoplastic (PTP) holographic camera. Holographic recording with an image-bearing signal beam leads to the appearance of two Bragg and two or more non-Bragg diffracted beams that shows the transformed images in each beam (rotation and angular amplification of images). Using this real-time mode of interferometry, the hologram is retrieved with a deformed object beam, resulting in the appearance of fringes with a proper phase shift in each of four diffracted beams. Retrieval with a time-modulated single-pixel object beam lead o timemodulated response in all diffraction orders. This one-shot (one-exposure) phase-shifting interferometry results in clarifying the object wave-front information (as an example, from the surface deformation) and solving the sign ambiguity problem. This procedure demonstrates that high-resolution holographic imaging of the PTP holographic camera static deformations in the order of ~0.1mm can be revealed on the diffusion reflection surface. In addition, it was demonstrated, that using the PTP materials could achieve holographic recording and imaging through phase aberration, with the image appearing in the non-Bragg diffraction order.

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Section: Recording In Photo-thermoplastic Carriersmentioning

confidence: 99%

“…In PTP self-diffraction is due to the formation of volume or surface phase-relief grating [2][3][4] that also produces efficient high-order diffraction beams. We will analyze the similarity through imaging and through holographic interferometry with higher diffraction orders for these two vastly different recording media.…”

Section: Introductionmentioning

confidence: 99%

Holographic imaging and interferometry with non-Bragg diffraction orders in lithium niobate and photothermoplastic materials

2012

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“…One advantage of recording holograms in a PR material is that the recorded hologram can be erased and the material can be used again. Also there is no need for a chemical process to develop the hologram as in photographic plates [4,5]. Higher order generation from self-diffraction is similar to Raman-Nath diffraction [6].…”

Section: Introductionmentioning

confidence: 99%

Phase-shifting holography using Bragg and non-Bragg orders in photorefractive lithium niobate

Abeywickrema

Banerjee

2014

SPIE Proceedings

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Holographic interferometry is an effective and rich method for measuring very small (order of a wavelength) deformations of an object and is widely used for non-destructive testing. In this work, the use of photorefractive materials for implementing real time phase shifting holographic interferometry is examined in detail. Bragg and non-Bragg orders generated during two-and multi-beam coupling in a photorefractive material can be used to retrieve the deformation of the object, or the phase information of the object. In previous work, it has been shown that object deformation can be determined from monitoring Bragg and non-Bragg orders. Preliminary experiments for determining the depth profile of an object have been reported, along with approximate analytic solutions for the Bragg and non-Bragg orders for the case of interacting plane waves. In this work, the exact solutions of Bragg and non-Bragg orders are found from numerically solving the interaction equations in a photorefractive material. It is shown that if the grating written in the material using two waves is read out by a reference and the object, the resulting Bragg and non-Bragg orders contain the information of the object phase, and is dependent on material parameters and the writing and reading beam intensities. Similarities and differences between this dynamic holographic technique and the traditional phase shifting digital holography are extensively discussed.

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“…The refractive index rating is created as a result of photoexcited charge transport due to diffusion, drift (and sometimes photovoltaic) effect, thus creating a space charge field which modulates the refractive index through the electro-optic effect [2,3]. On the other hand, PTPs are widely used in holography because they are reusable and there is no need for a wet chemical process for developing, as in traditional films [4,5]. The thermoplastic material repeatedly softens and hardens when heated and cooled.…”

Section: Introductionmentioning

confidence: 99%

Non-Bragg diffraction orders in holographic Recording and its application to one-shot phase-shifting holographic interferometry

et al. 2013

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In this paper we derive the underlying equations for real time holographic interferometry through selfdiffraction, and demonstrate experimentally on how to employ the different Bragg and non-Bragg diffraction orders to perform one shot determination of the phase deformation, or equivalently, the depth information of a deformed object. We also show that the various diffracted orders may be phase shifted with respect to each other with a constant phase shift which depends on the phase mismatch and the length of the recording material. This technique can therefore have an obvious advantage over traditional phase-shifting holography due to the elimination of the piezo-shifted mirror (inducing the different phase shifts) which limits the traditional technique to slow deformations.

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Real-time scaling of micro-objects by multiplexed holographic recording on photo-thermoplastic structure

Cited by 15 publications

References 4 publications

Holographic imaging and interferometry with non-Bragg diffraction orders in lithium niobate and photothermoplastic materials

Holographic imaging and interferometry with non-Bragg diffraction orders in lithium niobate and photothermoplastic materials

Phase-shifting holography using Bragg and non-Bragg orders in photorefractive lithium niobate

Non-Bragg diffraction orders in holographic Recording and its application to one-shot phase-shifting holographic interferometry

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