Practical Holography Research Articles

Statistical generalized phase-shifting digital holography with a continuous fringe-scanning scheme.

We propose a novel statistical generalized phase-shifting digital holography using a continuous fringe-scanning scheme. In this method, the continuous fringe-scanning scheme is implemented using a PC-based measurement system without any synchronous circuit between the digital camera and the phase shifter. Thus, nonuniformly phase-shifted interference fringes are captured sequentially because of the fluctuation of the image-capturing interval. To cope with the nonuniform phase shifts, we employ a statistical generalized phase-shifting approach. Since the algorithm is designed to use an arbitrary phase shift, the nonuniform phase shifts do not obstruct object wave retrieval. Simulations and experiments demonstrate that the proposed method can be used to implement a practical and accurate digital holography system.

Large scale calculation for holography using SSD

Computer based holography such as electro-holography and digital holography advances because the resolution of an imaging display and a sensing device such as a liquid crystal display (LCD) and a charge coupled device (CCD) becomes higher. A higher resolution of imaging device requires the more powerful computing system. On the other hand, a solid state drive (SSD) develops as a storage device of computers. We studied the effectiveness of SSD for a large-scale digital holography calculation. When the calculation data scale exceeds the main memory capacity, the SSD system showed better performance compared with the hard disk drive (HDD) system at computational speed and stability. Full Text: PDF References M. Stanley et al., 100-megapixel computer-generated holographic images from Active Tiling: a dynamic and scalable electro-optic modulator system, Proc. SPIE 5005, Practical Holography XVII and Holographic Materials IX, 247 (2003) CrossRef H. Sasaki, K. Yamamoto, Y. Ichihashi, T. Senoh, Large size three-dimensional video by electronic holography using multiple spatial light modulators, Scientific Reports 4, Article number 04000 (2014) CrossRef T. Kozacki, G. Finke, P. Garbat, W. Zaperty, M. Kujawinska, Wide angle holographic display system with spatiotemporal multiplexing, Opt. Express 20, 27473-27481 (2012) CrossRef T. Shimobaba et al., In-line digital holographic microscopy using a consumer scanner, Scientific Reports 3, Article number 02664 (2013). CrossRef S.O.Isikman, A.Greenbaum, W.Luo,A.F.Coskun, A.Ozcan, Giga-Pixel Lensfree Holographic Microscopy and Tomography Using Color Image Sensors, PloS one, 7(9), e45044 (2012) CrossRef T. Shimobaba et al., Computational wave optics library for C++: CWO++ library, Comput. Phys. Commun. 183, 1124-1138 (2012) CrossRef

Special Section Guest Editorial: Practical Holography: New Procedures, Materials, and Applications

This PDF file contains the editorial “Special Section Guest Editorial: Practical Holography: New Procedures, Materials, and Applications” for OE Vol. 53 Issue 11

A survey of lasers at the birth of holography

The 50th anniversary of the first hologram made with laser light is an appropriate time to shine some light on the lasers that made it possible. Dubbed "a solution looking for a problem", the laser emerged from industrial research labs as a new kind of light source for any application requiring coherence. Immediately commercialized by both start-up and well-established corporations, lasers sold in their first year of production left much to be desired but made a good first impression. Their second year of production saw technical improvements that met the requirements for practical holography, and by the end of 1963 were good enough to make holograms of three dimensional, deep and diffuse imagery. Mostly obsolete by the end of the 1960s, very few of the Kennedy era lasers have survived. This survey is intended to identify and celebrate them, so more may be preserved as they are found, to be admired in the future.

Physical Compensation of Quadratic Phase Aberrations in Practical Digital Holographic Systems

MEMS is believed as a most promising technology in future. DHM is a powerful technique to characterize the behavior of MEMS. In the reconstruction process of a digital hologram, aberrations always exist, which is always removed by the software installed in the computer. We propose a method to obtain an aberration free digital hologram. The optical arrangement is presented to verify the possibility of our method, which is then improved by a space-fiber hybrid system. The system is flexible and useful in designing a practical digital holography microscope.

Practical holography at SPIE Photonics West

I'm in San Francisco this week for SPIE Photonics West, the world's leading photonics, laser, and biomedical optics event, according to the conference slogan. The conference is huge. In fact, it consists of five separate but contemporaneous conferences: BiOS (1771 research papers), LASE (662), MOEMS-MEMS (202), OPTO (1320), and Green Photonics (270).

Study on the mechanism of dark enhancement in phenanthrenequinone-doped poly(methyl methacrylate) photopolymer for holographic recording

The dark enhancements with various exposure energies are studied in thick PQ/PMMA photopolymer. Considered the weak molecules diffusion of PQ component and the grating detuning, a new mechanism of dark reaction is proposed to explain the dark enhancement. Moreover, the influences of dark reaction on Bragg angular selectivity and grating recording are analyzed. The results are beneficial to the practical holography application.

Scan-based near-field acoustical holography and partial field decomposition in the presence of noise and source level variation

Practical holography measurements of composite sources are usually performed using a multireference cross-spectral approach, and the measured sound field must be decomposed into spatially coherent partial fields before holographic projection. The formulations by which the latter approach have been implemented have not taken explicit account of the effect of additive noise on the reference signals and so have strictly been limited to the case in which noise superimposed on the reference signals is negligible. Further, when the sound field is measured by scanning a subarray over a number of patches in sequence, the decomposed partial fields can suffer from corruption in the form of a spatially distributed error resulting from source level variation from scan-to-scan. In the present work, the effects of both noise included in the reference signals, and source level variation during a scan-based measurement, on partial field decomposition are described, and an integrated procedure for simultaneously suppressing the two effects is provided. Also, the relative performance of two partial field decomposition formulations is compared, and a strategy for obtaining the best results is described. The proposed procedure has been verified by using numerical simulations and has been applied to holographic measurements of a subsonic jet.

Development of electron holography system in field emission electron microscrope

Electron holography is a powerful and practical method to know the phase of electron wave quantitatively and enables us to obtain various kinds of physical information such as magnetic and electric field distribution inside/outside of the specimen, thickness of the crystal etc. Since this method requires an FE-TEM equipped with an electron biprism and some electron hologram reconstruction methodology, the general EM users is typically not yet familiar with electron holography practice. The recent introduction of commercial type FE-TEM, however, brings some users the opportunities of practical electron holography applications. We have recently developed an electron holography system for our FE-TEMs, the JEM-2010F and the JEM-3000F. The components, specifications and some application data are presented below:Our electron holography system consists of electron biprism, power supply and hologram reconstruction processor(PC + software). The electron biprism is rotatable and the beam-splitting electrode(a Pt wire of 0.6 μm in diameter) can be cleaned by direct heating. The electron biprism is of the cartridge type for easy maintenance, thus removing the necessity of wire exchange.

Practical Holography

Practical Holography

Manual of Practical Holography

Manual of Practical Holography

Practical Holography

Practical Holography

Practical Holography

Practical Holography

An elementary introduction to practical holography

Holography is not only a new branch of modern optics; it is also a new art form. The beginning holographer, whether he is an artist, an engineer, or a scientist, usually has difficulty in finding an easily understandable article describing the ’’how to do it’’ aspects of making a hologram. This article is intended to alleviate some of the difficulties by presenting both an understandable geometric model of the hologram and a step-by-step guide to the procedures involved in making a hologram. Editor’s note: Reviewers of this article have found it technically correct but question whether a presentation that treats a subject ’’from the beginning’’ is suitable in level for the American Journal of Physics. We feel that an occasional clearly written ’’how to do it’’ article that enables the nonspecialist to set up the simplest demonstrations in a field are entirely suitable for the Journal, provided an overall balance in level and subject is maintained in the Journal as a whole.