| 摘要 |
PURPOSE:To electrically control the pulse width of Q-switch pulse light from outside by controlling the timing of radio frequency signals for generating ultrasonic waves advancing straight in directions different from each other. CONSTITUTION:The first transducer 12 generates the ultrasonic waves advancing in the direction of an arrow 12a. The second transducer 13 generates the ultrasonic waves advancing in the direction 13a vertical to the arrow 12a. The frequencies of the ultrasonic waves generated in the first and second transducers 12 and 13 are determined by the frequency of an RF signal generator 10 for generating ultrasonic waves. The timing of stopping the ultrasonic waves generating in the second transducer 13 is controlled by phase adjustment with a phase shift circuit 9. When the phase of ultrasonic waves by the second transducer 13 is delayed by adjusting the difference in phase between the two ultrasonic waves by means of the phase shift circuit 9. Q-switch pulse light produced by superposition of the two pulses is outputted. |
