Choice of Aconsto-Optic Guide Media for Aconsto-Optic Devices

摘要

Lasers are widely used in industry, medicine, communications, data processing and computing devices, for atmospheric probing, etc. In many applications, devices for laser beam control are required. These devices include acousto-optic devices whose basic elements is an acousto-optic cell (see Fig. 1). The acousto- optic cell contains the electro-acoustic transducer 1 intended for generation of elastic (acoustic) waves in the acousto-optical interaction medium, i.e., in the acousto-optic guide 4, and the acoustic load 7 providing for the travelling acoustic wave mode of operation of the acousto-optic guide. At frequencies up to 400 MHz, crystal piezoelectric plates are used as electro-acoustic transducers. The piezoelectric plate is attached to the acousto-optic guide by thermocompression welding. Figure 1 also shows the top 2 and bottom 3 electrodes, the L- and H-dimensions of the piezoelectric plate determining the acousto-optical interaction region geometry, the laser beam 8 passing to the acousto-optical interaction region, the diffracted information- carrying laser beam 6, and the part 5 of the laser beam not interacting with acoustical waves (undiffracted. laser beam).