Real Time Optical Processing with Bi<sub>12</sub>SiO<sub>20</sub> PROM

Peter Nisenson; Sato Iwasa

doi:10.1364/AO.11.002760

Applied Optics
Vol. 11,
Issue 12,
pp. 2760-2767
(1972)
•https://doi.org/10.1364/AO.11.002760

Real Time Optical Processing with Bi₁₂SiO₂₀ PROM

Peter Nisenson and Sato Iwasa

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Peter Nisenson and Sato Iwasa, "Real Time Optical Processing with Bi₁₂SiO₂₀ PROM," Appl. Opt. 11, 2760-2767 (1972)

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Abstract

Use of the Itek PROM, a Pockels effect real time electrooptic image modulator, in optical processing systems is discussed. Applications include an incoherent-to-coherent converter for word/character recognition systems; on-line Vander Lugt type Fourier plane filters for real time cross correlation; a block data composer for holographic memories; and an active storage array for a parallel optical digital computer.

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Device	Bi₁₂SiO₂₀ PROM Operating in reflex mode
Optical aperture of the PROM	12 × 12 mm
Incoherent input sensitivity	25 ergs/cm² at 404 nm
Maximum readout illumination of PROM without image decay	4000 ergs/cm² at 633 nm
Resolution	1200 × 1200 resolution elements total
Hard copy size	21 × 27 cm
Contrast ratio	>1000:1
Input exposure time	48 msec
Readout period	Less than 1 msec
Frame refresh period	1 msec
One full operation	50 msec
Cyclability	No limit

Data block size	2 × 2 cm
Readout contrast ratio	>1000:1
Optical efficiency (light transmitted in on state)	50%
Total spot background area ratio	8%
Maximum object beam energy (8% × 9200 ergs)	736 ergs
Cyclability	No limit
Bit locations	128 × 128
Data readin rate	4.6 × 10⁶ bits/sec
Data readin time	3.600 msec
Hologram exposure	0.010 msec
Frame refresh time	1.000 msec

Total cycle time	4.610 msec
Average data transfer rate	3.5 × 10⁶ bits/sec

Device	Bi₁₂SiO₂₀ PROM Operating in reflex mode
Optical aperture of the PROM	12 × 12 mm
Incoherent input sensitivity	25 ergs/cm² at 404 nm
Maximum readout illumination of PROM without image decay	4000 ergs/cm² at 633 nm
Resolution	1200 × 1200 resolution elements total
Hard copy size	21 × 27 cm
Contrast ratio	>1000:1
Input exposure time	48 msec
Readout period	Less than 1 msec
Frame refresh period	1 msec
One full operation	50 msec
Cyclability	No limit

Data block size	2 × 2 cm
Readout contrast ratio	>1000:1
Optical efficiency (light transmitted in on state)	50%
Total spot background area ratio	8%
Maximum object beam energy (8% × 9200 ergs)	736 ergs
Cyclability	No limit
Bit locations	128 × 128
Data readin rate	4.6 × 10⁶ bits/sec
Data readin time	3.600 msec
Hologram exposure	0.010 msec
Frame refresh time	1.000 msec

Total cycle time	4.610 msec
Average data transfer rate	3.5 × 10⁶ bits/sec

Abstract

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Tables (2)

Equations (1)

Applied Optics