Volume-recorded hologram modeling, point-spread function analysis, and segmented adaptive equalization for holographic data storage

Makoto Hosaka; Toshiki Ishii; Taku Hoshizawa

doi:10.1364/AO.58.004678

Applied Optics
Vol. 58,
Issue 17,
pp. 4678-4686
(2019)
•https://doi.org/10.1364/AO.58.004678

Volume-recorded hologram modeling, point-spread function analysis, and segmented adaptive equalization for holographic data storage

Makoto Hosaka, Toshiki Ishii, and Taku Hoshizawa

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Makoto Hosaka, Toshiki Ishii, and Taku Hoshizawa, "Volume-recorded hologram modeling, point-spread function analysis, and segmented adaptive equalization for holographic data storage," Appl. Opt. 58, 4678-4686 (2019)

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Abstract

The rapid growth in digital information throughout the world has demanded storage with a high capacity and high transfer rate. Holographic data storage (HDS) is one promising candidate for next-generation data storage because of its high potential in capacity and transfer rate. However, high-volume HDS usually suffers from inter-signal interference (ISI). Here, we first develop volume recording and reproduction models for HDS. We reveal through optical simulations based on the developed models that ISI differs not only between pages but also between areas on the same page. Then, we develop an advanced equalization technique called segmented adaptive equalization (SAE) that takes into account inter-area ISI difference. We can improve signal quality much more than conventional equalization techniques by using SAE. We are confident that SAE can enhance the realization of HDS.

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Wavelength	405 nm
Focal length of objective lens	7.4 mm
NA of objective lens	0.85
Hologram size (at the center of medium)	$308 \times 308 μm$
SLM size	$832 \times 1, 152$ pixels
SLM pixel size	$10.67 \times 10.67 μm$
Reference beam angle	40 deg
Reference beam size (in front of medium)	$4.0 \times 4.0 mm$
Medium thickness	1.5 mm
Layer number of medium	7
Domain size	$16, 384 \times 16, 384$ pixels
Grid size on camera (before FFT)	$889.2 \times 889.2 nm$
Grid size on medium (after FFT)	$205.7 \times 205.7 nm$

Common	Wavelength of blue laser diode	405 nm
	Numerical aperture of objective lens	0.85
	Medium thickness	1.5 mm
Recording	Signal beam power (in front of medium)	0.26 mW
	Reference beam power (in front of medium)	0.94 mW
	Curing beam power (in front of medium)	20 mW
	Diffusion time	120 s
	Exposure time	3.5 ms
	Pre-curing time	1.5 s
	Post-curing time	180 s
Reproducing	Reference beam power (in front of medium)	0.94 mW
	Exposure time	100 ms

Wavelength	405 nm
Focal length of objective lens	7.4 mm
NA of objective lens	0.85
Hologram size (at the center of medium)	$308 \times 308 μm$
SLM size	$832 \times 1, 152$ pixels
SLM pixel size	$10.67 \times 10.67 μm$
Reference beam angle	40 deg
Reference beam size (in front of medium)	$4.0 \times 4.0 mm$
Medium thickness	1.5 mm
Layer number of medium	7
Domain size	$16, 384 \times 16, 384$ pixels
Grid size on camera (before FFT)	$889.2 \times 889.2 nm$
Grid size on medium (after FFT)	$205.7 \times 205.7 nm$

Common	Wavelength of blue laser diode	405 nm
	Numerical aperture of objective lens	0.85
	Medium thickness	1.5 mm
Recording	Signal beam power (in front of medium)	0.26 mW
	Reference beam power (in front of medium)	0.94 mW
	Curing beam power (in front of medium)	20 mW
	Diffusion time	120 s
	Exposure time	3.5 ms
	Pre-curing time	1.5 s
	Post-curing time	180 s
Reproducing	Reference beam power (in front of medium)	0.94 mW
	Exposure time	100 ms

Abstract

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Figures (12)

Tables (2)

Equations (12)

Applied Optics