Ref HAL: hal-02403211_v1
DOI: 10.1002/9781119091745.ch1
Exporter : BibTex | endNote
Résumé:

This chapter introduces the principles of digital holography, as well as the associated reconstruction methods. It presents the basic properties related to a digital hologram. In order to discuss the digital reconstruction of the object wave at the object plane, the chapter presents the basics of the scalar diffraction of light. Algorithms used to back-propagate the object field estimated at the sensor plane are based on this approach. The chapter discusses the use of the theoretical basics of wave propagation to numerically reconstruct the object wave at the object plane. It also discusses the different experimental configurations to record a digital hologram. The chapter provides basic experimental arrangements and gives few explications on how it works. Digital holographic interferometry exploits not only the amplitude of the object, but also its phase. Finally, the chapter describes the basic principle of digital holographic interferometry, and quantitative phase tomography.

Ref HAL: hal-01663045_v1
Exporter : BibTex | endNote

Ref HAL: hal-01225788_v1
Ref Arxiv: 1511.04263
DOI: 10.1364/AO.54.009540
WoS: 000364456300025
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
3 Citations
Résumé:

An holographic microscopy reconstruction method compatible with high numerical aperture microscope objective (MO) up to NA=1.4 is proposed. After off axis and reference field curvature corrections, and after selection of the +1 grating order holographic image, a phase mask that transforms the optical elements of the holographic setup into an afocal device is applied in the camera plane. The reconstruction is then made by the angular spectrum method. The field is first propagated in the image half space from the camera to the afocal image of the MO optimal plane (plane for which MO has been designed) by using a quadratic kernel. The field is then propagated from the MO optimal plane to the object with the exact kernel. Calibration of the reconstruction is made by imaging a calibrated object like an USAF resolution target for different positions along z. Once the calibration is done, the reconstruction can be made with an object located in any plane z. The reconstruction method has been validated experimentally with an USAF target imaged with a NA=1.4 microscope objective. Near-optimal resolution is obtained over an extended range (±50 µm) of z locations.

Ref HAL: hal-01332698_v1
PMID 26835961
Ref Arxiv: 1511.04257
DOI: 10.1364/AO.55.0000A8
WoS: WOS:000369055100003
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
8 Citations
Résumé:

Heterodyne holography is a variant of phase shifting holography in which reference and signal arms are controlled by acousto optic modulators. In this review paper, we will briefy describe the method and its properties, and we will illustrate its advantages in experimental applications.

Commentaires: . Réf Journal: Appl. Opt. 55, A8-A16 (2016)

Ref HAL: hal-01224128_v1
DOI: 10.1364/DH.2015.DM2A.1
Exporter : BibTex | endNote
Résumé:

Heterodyne holography is a variant of phase shifting holography in which reference and signal arms are controlled by acousto optic modulators. We will briefly describe the method and illustrate its advantages on experimental examples.

Ref HAL: hal-01224119_v1
DOI: 10.1364/DH.2015.DTh2A.6
Exporter : BibTex | endNote
Résumé:

An holographic laser Doppler scheme using two illumination beams is proposed to image blood vessel in fish embryo. The coincidence of the reconstructed images made for each illumination orientation leads to an accurate z sectioning.

Ref HAL: hal-01153662_v2
Ref Arxiv: 1505.05706
DOI: 10.1364/AO.54.004672
WoS: WOS:000354898100010
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
9 Citations
Résumé:

We propose an holographic microscopy reconstruction method, which propagates the hologram, in the object half space, in the vicinity of the object. The calibration yields reconstructions with an undistorted reconstruction grid i.e. with orthogonal $x$, $y$ and $z$ axis and constant pixels pitch. The method is validated with an USAF target imaged by a $\times$60 microscope objective, whose holograms are recorded and reconstructed for different USAF locations along the longitudinal axis: -75 to +75 $\mu$m. Since the reconstruction numerical phase mask, the reference phase curvature and MO form an afocal device, the reconstruction can be interpreted as occurring equivalently in the object or in image half space.