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 µm. The giant values of the figure of merit M associated with these two AO interactions equal to 285,000 × 10-15 s3/kg, are between 2 and 3 orders of magnitude higher than germanium, the next best AO material for 10.6 µm. This latter value indicates that acoustic power densities inside the crystal of the order of 0.1 W/mm2 are sufficient to diffract 100% of the incident light. The experimental data confirm the predicted 13°/25 MHz deflection slope. The theoretical amplitude and frequency modulation characteristics of the 2DAO deflector are also evaluated.
© 1990 Optical Society of America
Dominique Souilhac, D. Billerey, and A. Gundjian, "Infrared two-dimensional acoustooptic deflector using a tellurium crystal," Appl. Opt. 29, 1798-1804 (1990)