{'fraction_non_alphanumeric': 0.03481392557022809, 'fraction_numerical': 0.026410564225690276, 'mean_word_length': 4.712328767123288, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
An acousto-optic X–Y deflector based on close-to-axis propagation of light in the single Te crystal

A single crystal of tellurium was investigated for the development of a two-dimensional acousto-optic (X–Y) deflector operating from 6.5 to 14.5 µm. Both the theoretical and the experimental investigations of the device were performed. The measured value of optical transmission of the antireflection-coated crystal was 70%, corresponding to a relatively low optical absorption coefficient α ≤ 0.3 cm − 1. Detailed characterization of the device was carried out at 10.6 µm using a CO2 laser and the diffraction efficiency of the deflector along each of two orthogonal directions was found to be 50–60% at 1.0–2.0 W drive power. Here, we present results from both the experimental and the theoretical investigations of the deflector.