Content area
The influence of acoustic field distribution and temperature variations on the full-aperture diffraction efficiency of non-collinear acousto-optic tunable filters (AOTFs) was investigated based on tellurium dioxide crystals. The strong acoustic anisotropy of the crystal induces non-uniform acoustic energy distribution, limiting the overall diffraction efficiency. To analyze this effect, the acoustic field distribution within a large-aperture AOTF was simulated, and the diffraction efficiency across different aperture regions was evaluated and experimentally validated. The results demonstrate that sound beam contraction and acoustic energy non-uniformity significantly reduce the peak diffraction efficiency and increase the power required to achieve high diffraction efficiency. Additionally, temperature-induced variations in acoustic velocity alter the acoustic field structure, leading to spatially non-uniform changes in diffraction efficiency. Both simulations and experimental measurements confirm that while the overall impact of temperature on full-aperture diffraction efficiency remains relatively small, localized variations are pronounced, highlighting potential inaccuracies in single-beam-based efficiency measurements.
Details
Nonuniformity;
Tellurium dioxide;
Tunable filters;
Anisotropy;
Crystals;
Acousto-optics;
Apertures;
Sound diffraction;
Influence;
Optics;
Diffraction efficiency;
Efficiency;
Simulation;
Velocity;
Sound fields;
Temperature effects;
Tellurium;
Diffraction;
Temperature requirements;
Variation;
Acoustics;
Dioxides;
Acoustic velocity;
Light;
Ultrasonic imaging;
Energy distribution
; Zhong Zhoujun 1 ; Zhou Chengsheng 1 1 School of Instrumentation Science & Opto-Electronics Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100191, China; [email protected] (Q.G.); [email protected] (Z.Z.); [email protected] (C.Z.)
2 School of Instrumentation Science & Opto-Electronics Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100191, China; [email protected] (Q.G.); [email protected] (Z.Z.); [email protected] (C.Z.), Key Laboratory of “Precision Opto-Mechatronics Technology”, Ministry of Education, No. 37 Xueyuan Road, Haidian District, Beijing 100191, China, Institute of Artificial Intelligence, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100191, China
3 School of Instrumentation Science & Opto-Electronics Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100191, China; [email protected] (Q.G.); [email protected] (Z.Z.); [email protected] (C.Z.), Key Laboratory of “Precision Opto-Mechatronics Technology”, Ministry of Education, No. 37 Xueyuan Road, Haidian District, Beijing 100191, China