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The first single element 2-D acoustooptic (2DAO) laser beam deflector using a tellurium crystal was designed and fabricated for laser wavelength applications from 5 to 20 microm. The giant values of the figure of merit M associated with these two AO interactions equal to 285,000 x 10(-15) s(3)/kg, are between 2 and 3 orders of magnitude higher than germanium, the next best AO material for 10.6 microm. This latter value indicates that acoustic power densities inside the crystal of the order of 0.1 W/mm(2) are sufficient to diffract 100% of the incident light. The experimental data confirm the predicted 13 degrees /25 MHz deflection slope. The theoretical amplitude and frequency modulation characteristics of the 2DAO deflector are also evaluated.

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ABSACPAn improved Te02 and Te infrared acoustooptic tunable spectrometer has been analysed , using infrared fibers , a high speed frequency synthesizer and optimized algorithms. A comparison is made with the next best AGI'F infrared materials, Tl3AsSe3 , HgC12 and PbBr2.A design study of the Te02 and Te AO imaging spectrcnter is also presented, operating in the two thermal bands, 1-5n and 6-l2pm, using an interchangeable foreoptics and a multiplexed electronically scanned infrared array cooled at 77°K. Some initial experimental results indicate that these systems can perform well, an increase in the dynamic range in the 8-i 2pm waveband is obtained compared to the 3-5ijm band . It can be very useful in chemical process control , medical diagnostics, aerospace and earth remote sensing. Based on recent imaging spectrcrneter develoxnent , a design study of the Te02 imaging spectrometer . (0 . 4-1 n band) , for simultaneous spectroscopy at every pixel, is presented, using a CCI) camera and fast data processing technology.