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根据近期文献概述了这种器件的原理和设计,一个样品的主要设计参数是:声波偏离[110]方向5.9°传播,光波沿偏离[001]方向4.1°入射,使用光波长6328埃.中心频率75兆赫,带宽40兆赫,转换时间10微秒.晶体尺寸15×10×8(毫米),LiNbO_3换能器宽及高为8×3(毫米).对器件制作的主要工艺,包括晶体加工,换能器粘贴,通光面增透等作了扼要说明,今年获得的实验结果是:采用热铟焊取代环氧树脂粘贴换能器,改进信号源输出,使偏转效率由50%提高到最大可达80%;Te0_2单层增透使透光率提高约20%;对铟层厚度进行控制,增加了带宽;探索了严重影响光斑质量的某些因素并使光斑质量获得一定程度的改善.目前的器件,带宽超过40兆赫,时间带宽乘积大于400,在不受光学系统限制的条件下可实现128×128点的两维矩阵扫描.
The principle and design of this device are summarized according to recent literature. The main design parameters of a sample are: the acoustic wave propagates 5.9 ° away from the [110] direction and the light wave enters 4.1 ° away from the [001] direction using a light wavelength of 6328 A. The center frequency 75 MHz, bandwidth 40 MHz, conversion time of 10 μs Crystal size 15 × 10 × 8 (mm), LiNbO 3 transducer width and height of 8 × 3 (mm) The main process of device fabrication, including crystal processing, Transducer paste, pass through the surface of alumni made a brief description of the experimental results obtained this year: the use of hot indium solder instead of epoxy paste paste transducer to improve the signal output, the deflection efficiency increased from 50% to the maximum Up to 80%. The transmittance of Te0_2 single layer increases the transmittance by about 20%. The thickness of indium layer is controlled and the bandwidth is increased. Some factors that seriously affect the spot quality are explored and the spot quality is improved to a certain extent. Current devices, with bandwidths in excess of 40 MHz and time-bandwidth products greater than 400, are capable of 128 × 128 two-dimensional matrix scans without optical system limitations.