Acousto-Optic Tunable Filter(AOTF)is a dispersive element based on acousto-optic effect.By chan-ging the ultrasonic frequency,the diffraction direction of the light can be changed,so as to select the wavelength.In this study,a new two-pass dispersive AOTF structure is designed and studied using finite element analysis software.The results of the present study show that the design of this dual-range dispersive AOTF can effectively compress the spectral linewidth.When the center wavelength is 1 064 nm,the linewidth compression efficiency reaches 28.6％at an ultrasonic operating frequency of 84 MHz,which indicates that the spectral resolution has been significantly im-proved;at the same time,this structure also has a strong inhibition of sidelobes,which can compress the sidelobes of the diffracted light with a center wavelength of 1 064 nm from-27.0 dB to-44.8 dB,which improves the spectral pu-rity.
acousto-optic diffractionacousto-optic effectdouble-pass dispersionfinite element analysisspectral resolution
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