Proceedings PaperMulti-Stage Acousto-Optic Modulator
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Bulk acousto-optic modulation was investigated as a technique for generating high bandwidth linear chirp waveforms for ladar applications. The high modulation bandwidth was achieved by cascading the Bragg cells, in which each cell produces only a fraction of the total bandwidth, and large optical beam diameters and high optical energies can be used. Both germanium and thallium arsenic selenide (TAS) were investigated as acousto-optic materials, and comparisons were made between the two materials. Cooled germanium was also studied as a means of lowering the acoustic attenuation, and the thermal conductivity of cryogenically cooled Ge was measured.