&lt;title&gt;Gray-scale-level transmission by acousto-optical devices&lt;/title&gt;

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As other acousto-optic devices, acoustooptic tunable filters (AOTF) deal with information processing and transmission. However, in major cases, AOTF transmits information in a specific form -the data are containrd in output light spectrum or wavelength. The estimation of possible amount of information which can be processed and transmitted by AOTF, requires to define the resolving power of a device by wavelength. The wavelength resolving power criterion has been elaborated in the presented paper. It proceeds from the condition of the necessary probability of one bit of information recognition. Taking into consideration this criterion as well as the need to distinguish gray scales in a pattern of wavelengths, the information transmission capability of AOTF has been calculated. Along with that, it has been shown that such parameter as information capacity of AOTF represents a significant importance while analyzing the spectral composition of light transmiued through media to be studied. Some features of tellurium dioxide single crystals influencing the AOTF information possibilities, have been discussed.

Section: Aotf Resolving Power Criterionmentioning

confidence: 99%

Resolving power and information properties of acousto-optic tunable filters

Gurevich¹,

Andreyev²,

Akkoziev

et al. 1999

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“…As Raleigh criterion defines only resolution of peaks, so this value may occur to be insufficient for the beams complete separation, as well as value 4?Jtd 1.27 ?Jd [2]. Hence, it is necessary to introduce factor J3 which describes the required increasing of the angular width in order to avoid even partial overlapping of the beams propagating into the adjacent positions [6]. This value must be in the range between 1.5 and 2.…”

Section: Total Information Capacity Regarding the Stored And Sampled mentioning

confidence: 99%

<title>Information limitations introduced by acousto-optic deflectors into holographic memory devices</title>

Gurevich

Alymkulov²,

Gurevich³

et al. 1999

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“…Let us suppose that the peak light intensities corresponding to acoustic frequencies/i andfi +?f differ (11) where I corresponds to the intensity of the bigger peak,dispersion of both peaks (obviously they must have the same dispersion). The Gaussian function argument (-x/cr2) corresponds to the argument of sinc function in expression (8), and coordinate x can be recalculated into wave vector mismatch K by solving of elementary geometric problem.…”

Section: Connection Between the Spectral Line Size And Aotf Resolvingmentioning

confidence: 99%

<title>Information properties of acousto-optic tunable filters</title>

Gurevich¹,

Andreyev²,

Belyaev³

et al. 2000

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Each acousto-optic device is intended generally for the purposes of information transmission and processing. Different kinds of such devices, however, transmit different kinds of information. Output information originating from acousto-optic tunable filters (AOTF) is contained in output light spectrum or wavelength. Amount of the transmitted information depends on different factors; the most important among them are AOTF resolving power by wavelength and the processing rate. The resolving power can be defined according to the following criterion: two adjacent wavelengths are considered to be resolved if their possibility to be non-recognized is less than the value given beforehand (usually determined by the customer of the device). This possibility can be measured if the valley between two peaks corresponding these wavelength is in the certain relationship with the value of noise. Hence, signal-to-noise ratio appears to be the most important factor describing information possibilities of AOTF. From the other hand, the processing rate depends on the temporal aperture of Bragg cell on the basis of which the device have been designed. The calculations of the possible amount of information to be transmiued by AOTF has been carried out both for collinear and noncollinear configurations of the device. The influence of features of slow shear acoustic wave propagation in tellurium dioxide single crystal in AOTF on information transmission through AOTF has been considered and discussed.