4、sedon optical devicesmade acousto-optic diffractionprinciple, it iscomposedof crystalandthe transducer in the constitution, transducer frequencyRF drivesignal (usuallyaround tensof megahertztotwohundredmegahertz)into ultrasonicvibration inthecrystal, ultrasonic the modulation ofs
5、patialperiodicity, itsrole as adiffractiongrating. Whentheincident light tothe gratingwillproduce Braggdiffraction, thediffraction lightwavelength and frequency drivesignal frequency is oneonetoonecorrespondence. Therefore, aslongasthechangein theRF frequencyofthedrivingsignal, c