By Goutzoulis

This paintings bargains designated discussions on all elements of acousto-optic deflectors, modulators and tunable filters, emphasizing hands-on methods for layout, fabrication and trying out. It comprises formerly unpublished remedies of acousto-optic gadget layout and impedance matching, allowing the particular layout of genuine units and device-matching circuits.

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5 W/cm2). Note that thesecond curve changes its asymptote at thepoint x = Io, which occurs when S,(x) is attenuated to thepoint where exp[ -alx] is the dominant factor. Also note that the exact value of Io is determined by the properties of the A 0 material and the input acoustic power density. Knowing the spatial dependence of Sl(x), wecanproceedwith the solution of Eq. (88). This solution is well approximated by where is the attenuation coefficient at the second harmonic frequency. 5 W/cm2. Longitudinal waves were used for propagation along [l111 with an input frequency of 200 MHz.

At oneacoustic frequency (or alternatively, the diffracted light wave vector kd must be equal to that of the incident light beam ki). If the direction of the diffracted beam is to be changed, we must change both the direction and the magnitude of the acoustic vector. For operationover a range of acoustic frequencies it is necessary to have a spread of the acoustic wave vector directions from the transducer. This is accomplished PRINCIPLES OF ACOUSTO-OPTICS 15 by using the acoustic diffraction resulting from a transducer of width L .

30) shows that the intensity of the diffracted order follows a sinc2-type behavior as the frequency changes. 5. This occurs when the argument of the sinc' function is equal to 2 0 . By using Eq. fcand A = V/f, we can write Eq. 8nCR AoLfc (33) Observe that Af is inversely proportional to the interaction length L. , at oneacoustic frequency (or alternatively, the diffracted light wave vector kd must be equal to that of the incident light beam ki). If the direction of the diffracted beam is to be changed, we must change both the direction and the magnitude of the acoustic vector.

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