Oxidation Tellurium (teo < Sub > 2 < / Sub >) Acousto-optic Device Frequency Characteristics Of The Transducer And The External Matching Network Design

Acousto-optic device is based on the principles of sound and light effects in crystal, fromMaxwell’s equations we can get the basic equation of optics in crystal to study the propagationproperties of light waves in crystals; from Newton’s second law in continuum media to get the basicequation of acoustic in crystal to study the propagation properties of acoustic waves in crystals, so wecan research the effects of sound and light in crystal.Acousto-optic coefficient and parameter of interaction are the two methods to describe the soundeffects. To establish the coupled wave equation for calculation the diffraction light intensity changecaused by sound and light effects. We can divide diffraction into La Man Naisi diffraction and Braggdiffraction, according to the length of sound and light interaction. As Bragg diffraction has a higherefficiency, so it is used in acousto-optic device.Because the relative acoustic impedance of oxidation tellurium is very small, so is very difficultto realize the matching impedance between each coating, leading to the loss of sound energy large.Using the acoustic antireflection film method to reduce sound reflection in each coating, increase thetransmission of sound waves and reduce the loss of sound energy. Using transfer matrix theory andMATLAB software to calculation the change of sound energy between each coating. We designedtransducer’s structures which have three, four, five layers, and select all the materials of each coating,then using the method of test in layer by layer to determine the relative thickness and calculate theactual thickness of each coatings, calculate the bandwidth of each transducers and analyzes therelationship of transducer loss and impedance between frequency. Using the matching networks totransducer for sound energy compensation can reduce the loss of acoustic energy, improving thesound energy utilization. Using of matching the network to the transducer for sound energycompensation, reducing the coating of loss of sound energy, improves the utilization of sound energy.