Fig. 1. RNd diffraction configurations.

Fig. 2. Schematic diagram of the experimental setup. U: ultrasonic transducer and its driver; DO: digital oscilloscope; A: amplifier; P: photomultiplier; PH: pinhole; DW: distilled water; L: laser.

Fig. 3. Waveforms from an oscilloscope. (a) Electrical signals exciting the ultrasonic transducer. (b) Optical signals from PMT.

Fig. 4. Distributions of the diffracted light in the acousto-optic crystal.

Fig. 5. Normalized average intensity of zero-order diffracted light versus the effective power of the electrical signals applied to the ultrasonic transducer in an acousto-optic crystal.

Fig. 6. Distributions of diffracted light in distilled water.

Fig. 7. Normalized average intensity of zero-order diffracted light versus the effective power of the electrical signal applied to the ultrasonic transducer in distilled water.