Holographic diversity interferometry for optical storage

Okamoto, Atsushi; Kunori, Keisuke; Takabayashi, Masanori; Tomita, Akira; Sato, Kunihiro

doi:10.1364/oe.19.013436

Cited by 58 publications

(31 citation statements)

References 15 publications

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“…Then, the SCM image was displayed onto the PSLM. After that, the complex amplitude distribution of the reconstructed light was measured by holographic diversity interferometry (HDI) 13,14 , which is one of the phase-shifting digital holography. Figure 6 shows the experimental results.…”

Section: Methodsmentioning

confidence: 99%

Highly accurate spatial mode generation using spatial cross modulation method for mode division multiplexing

et al. 2016

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We propose a spatial mode generation technology using spatial cross modulation (SCM) for mode division multiplexing (MDM). The most well-known method for generating arbitrary complex amplitude fields is to display an off-axis computer-generated hologram (CGH) on a spatial light modulator (SLM). However, in this method, a desired complex amplitude field is obtained with first order diffraction light. This critically lowers the light utilization efficiency. On the other hand, in the SCM, the desired complex field is provided with zeroth order diffraction light. For this reason, our technology can generate spatial modes with large light utilization efficiency in addition to high accuracy. In this study, first, a numerical simulation was performed to verify that the SCM is applicable for spatial mode generation. Next, we made a comparison from two view points of the coupling efficiency and the light utilization between our technology and the technology using an off-axis amplitude hologram as a representative complex amplitude generation method. The simulation results showed that our technology can achieve considerably high light utilization efficiency while maintaining the enough coupling efficiency comparable to the technology using an off-axis amplitude hologram. Finally, we performed an experiment on spatial modes generation using the SCM. Experimental results showed that our technology has the great potential to realize the spatial mode generation with high accuracy.

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Section: Methodsmentioning

confidence: 99%

Highly accurate spatial mode generation using spatial cross modulation method for mode division multiplexing

et al. 2016

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“…In the first process, nothing was displayed onto the PSLM and the phase distribution of the optical random diffuser, which was located at the position of " " shown in Fig. 2, was measured by holographic diversity interferometry (HDI) [5]. The measured phase distribution was used for generating the diffused wavefront from the input 3D object in the encode step of the SCM as the virtual random diffuser.…”

Section: Spatial Cross Modulation Methodsmentioning

confidence: 99%

Experiment on three-dimensional display using spatial cross modulation method with an optical random diffuser

Sakuma

Okamoto

Shibukawa

et al. 2015

2015 20th Microoptics Conference (MOC)

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“…Next, the probe beam is reflected from the target sample as the scattered signal beam, and its complex-amplitude distribution is detected using holographic diversity interferometry (HDI), 32,33) a DH method with high spatial resolution. The CCD that comprises the HDI has a pixel size of 3.75 × 3.75 μm 2 and a pixel number of 1280 × 960.…”

Section: Setupmentioning

confidence: 99%

Digital confocal microscopy using a virtual 4f-system based on numerical beam propagation for depth measurement without mechanical scanning

Goto

Okamoto

Toda

et al. 2016

Jpn. J. Appl. Phys.

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We propose a digital confocal microscope using a virtual 4f-system based on numerical beam propagation for depth measurement without mechanical scanning. In our technique, the information in the sample target along the depth direction is obtained by defocusing the virtual 4f-system, which consists of two virtual lenses arranged in a computer simulation.The principle of our technique is completely different from that of the mechanical scanning method used in the conventional confocal microscope based on digital holography. By using the virtual 4f-system, the measurement and exposure time can be drastically reduced because multilayered tomographic images are generated using a single measurement. In this paper, we tested the virtual depth imaging technique by measuring cover glasses arranged along the depth direction.

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Holographic diversity interferometry for optical storage

Cited by 58 publications

References 15 publications

Highly accurate spatial mode generation using spatial cross modulation method for mode division multiplexing

Highly accurate spatial mode generation using spatial cross modulation method for mode division multiplexing

Experiment on three-dimensional display using spatial cross modulation method with an optical random diffuser

Digital confocal microscopy using a virtual 4f-system based on numerical beam propagation for depth measurement without mechanical scanning

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