Download Design and Fabrication of Acousto-optic Devices (Optical by Goutzoulis PDF

By Goutzoulis

This paintings deals certain discussions on all facets of acousto-optic deflectors, modulators and tunable filters, emphasizing hands-on systems for layout, fabrication and checking out. It comprises formerly unpublished remedies of acousto-optic machine layout and impedance matching, allowing the particular layout of actual units and device-matching circuits.

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For example, without folding the device of Fig. 15 would require a path length of 92 cm. In Section 2 we showed that the Bragg angle changes with frequency, and therefore for wideband devices it is necessary to use a sufficiently narrow transducer that the resulting acoustic beam spread satisfies the Bragg angle requirements over the band of interest. Unfortunately this solution results in relatively small interaction lengths which limit the diffraction efficiency, especially in isotropic interactions.

Figure 8 shows the wave vector diagram for the birefringent diffraction in a negative uniaxial crystal (where no > ne with n, = no and nd = ne). For a given acoustic direction there exist two distinct acoustic frequencies which satisfy exact momentum-matching conditions. From Fig. 8 we see that a change in the direction of the diffracted wave vector kd to kb can be obtained by a change in the magnitude of the acoustic wave vector K, to K:. Thus an optical beam can be deflected simply byvarying the frequency of a well-collimated acoustic beam which remains fixed in direction.

As mentioned, the acoustic nonlinearities result from the fact that an originally harmonic wave, while it propagates through a nonlinear medium, undergoes waveform distortions. These distortions result in a waveform whose leading-edge slope is much greater than that of the trailing edge and which asymptotically reaches a sawtooth shape. This propagating sinusoidal acoustic signal can be viewed as a sum of harmonics whose parameters depend not only on the nonlinear characteristics of the crystal and the power density at the fundamental, but also on the power absorption coefficients of the harmonics.

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