Electrical Control of the Frequencies of a Fabry–Perot Acoustic Resonator
The effect electronic tuning has on the frequency of the acoustic resonance of an acousto-optic modulator intended for active laser mode locking is studied theoretically and experimentally. The problem of exciting a Fabri–Perot acoustic resonator with a plate-like piezoelectric transducer is solved in the approximation of plane acoustic waves, with allowance for the real parameters of the HF generator and the matching elements of the transducer and the generator. Expressions for the basic electrical and acoustic parameters are obtained. Theoretical analysis confirms the frequency shift effect of acoustic resonances, observed earlier experimentally upon varying the matching electrical elements. The experiment is performed using an acousto-optic quartz cell and a lithium niobate transducer.