Fast and highly parallel content addressing of a large amount of information recorded in a holographic memory

Xiang-Zhao Wang; Akira Hirai; Kouhei Shioya; Masashi Ohkawa; Seishi Sekine; Shigeru Ando

doi:10.1364/AO.33.003003

Applied Optics
Vol. 33,
Issue 14,
pp. 3003-3009
(1994)
•https://doi.org/10.1364/AO.33.003003

Fast and highly parallel content addressing of a large amount of information recorded in a holographic memory

Xiang-Zhao Wang, Akira Hirai, Kouhei Shioya, Masashi Ohkawa, Seishi Sekine, and Shigeru Ando

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Xiang-Zhao Wang, Akira Hirai, Kouhei Shioya, Masashi Ohkawa, Seishi Sekine, and Shigeru Ando, "Fast and highly parallel content addressing of a large amount of information recorded in a holographic memory," Appl. Opt. 33, 3003-3009 (1994)

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Abstract

It has recently become possible to fabricate spatial light modulators for holographic information retrieval. We analyze the signal-to-noise ratios in two typical holographic information retrieval systems, serial and inverted, and we discuss the possibilities of implementing holographic information retrieval with a newly proposed spatial light modulator that uses a Fabry–Perot étalon with a piezoelectrically driven mirror.

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Elements	Serial-File System		Inverted-File System
Holograms	L_h × L_h = 80 × 80 mm,	M = 40 × 40 = 1600,	L_h × L_h = 6 × 6 mm,	M = 20 × 20 = 400,
	n = 12,	ϕ_h = 0.5 mm,	n = 33,	ϕ_h = 0.5 mm,
	l_h = 1.5 mm,		l_h = 0.1 mm,
	L₀ × L₀ = 20 × 20 mm,	ϕ₀ = 1 mm	L₀ × L₀ = 80 × 80 mm,	ϕ₀ = 1 mm
Spatial light modulators	L_s × L_s = 20 × 20 mm,	ϕ_s = 1 mm	L_s × L_s = 6 × 6 mm,	ϕ_s = 0.5 mm,
	T₀ = 40 μs,	η_ave = 1:120	T₀ = 40 μs,	η_ave = 1:1338
Photodetectors	L_p × L_p = 80 × 80 mm, A = 0.04 cm²,		L_p × L_p = 80 × 80 mm, A = 0.16 cm²,
	D* = 3.052 × 10¹⁰ (cm Hz^0.5/W),		D* = 5.478 × 10⁹ (cm Hz^0.5/W),
	NEP = 6.553 × 10⁻¹² (W/Hz^0.5),		NEP = 7.302 × 10⁻¹¹ (W/Hz^0.5),
	SNR = 10		SNR = 10
Lenses	ϕ₁ = 131 mm, τ₁ = 90%, f = 125 mm		Same
Light source	Semiconductor laser (0.1 μs, 1 W)		Same

Mirror	Reflectivity (%)	Transmittance (%)
1	95.6	2.1
2	94.1	1.5

Elements	Serial-File System		Inverted-File System
Holograms	L_h × L_h = 80 × 80 mm,	M = 40 × 40 = 1600,	L_h × L_h = 6 × 6 mm,	M = 20 × 20 = 400,
	n = 12,	ϕ_h = 0.5 mm,	n = 33,	ϕ_h = 0.5 mm,
	l_h = 1.5 mm,		l_h = 0.1 mm,
	L₀ × L₀ = 20 × 20 mm,	ϕ₀ = 1 mm	L₀ × L₀ = 80 × 80 mm,	ϕ₀ = 1 mm
Spatial light modulators	L_s × L_s = 20 × 20 mm,	ϕ_s = 1 mm	L_s × L_s = 6 × 6 mm,	ϕ_s = 0.5 mm,
	T₀ = 40 μs,	η_ave = 1:120	T₀ = 40 μs,	η_ave = 1:1338
Photodetectors	L_p × L_p = 80 × 80 mm, A = 0.04 cm²,		L_p × L_p = 80 × 80 mm, A = 0.16 cm²,
	D* = 3.052 × 10¹⁰ (cm Hz^0.5/W),		D* = 5.478 × 10⁹ (cm Hz^0.5/W),
	NEP = 6.553 × 10⁻¹² (W/Hz^0.5),		NEP = 7.302 × 10⁻¹¹ (W/Hz^0.5),
	SNR = 10		SNR = 10
Lenses	ϕ₁ = 131 mm, τ₁ = 90%, f = 125 mm		Same
Light source	Semiconductor laser (0.1 μs, 1 W)		Same

Mirror	Reflectivity (%)	Transmittance (%)
1	95.6	2.1
2	94.1	1.5

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Applied Optics