Abstract

This paper has displayed high potential capabilities of the acousto-optic delay line (AODL) in processing the wideband analog signals. The actuality of the development of the theory of physical processes in AODL suitable for practical applications is substantiated. An approximating method for solving this problem is proposed. It was shown that the use of piecewise-linear approximation made the calculation of the time and frequency characteristics of AODL much easier. Universal formulas were derived for determining the AODL output response, its duration and the rise time at different ratios of the input pulse duration and the time of the elastic wave packet crossing the laser beam. The method and formulas are proposed for determining the AODL cutoff frequency. The numerical simulation of the proposed formulas was performed and their adequacy proved. The paper discusses the possible use of obtained formulas for investigating the AODL characteristics beyond the cutoff frequency. The established patterns and the numerical analysis results were experimentally approbated using the mockup of AODL with direct detection. The oscillogram of input and output pulses obtained at different ratios of the input pulse duration to the time of the elastic wave packet crossing the laser beam are discussed in the context of established patterns and the numerical analysis results. The cutoff frequency was determined by using the normalized experimental graph plot of AODL amplitude frequency characteristic, and it was shown that the obtained cutoff frequency was in good correspondence with the numerical analysis results.

中文翻译：

---

研究声光延迟线特性的近似方法

摘要

本文展示了声光延迟线 (AODL) 在处理宽带模拟信号方面的巨大潜力。AODL 中的物理过程理论发展适用于实际应用的现实得到了证实。提出了一种近似方法来解决这个问题。结果表明，分段线性逼近的使用使得 AODL 的时间和频率特性的计算变得更加容易。导出了通用公式，用于确定 AODL 输出响应、其持续时间和在输入脉冲持续时间和弹性波包穿过激光束的时间的不同比率下的上升时间。提出了确定AODL截止频率的方法和公式。对所提出的公式进行了数值模拟，并证明了它们的适当性。本文讨论了可能使用获得的公式来研究截止频率以外的 AODL 特性。使用带有直接检测的 AODL 模型对所建立的模式和数值分析结果进行了实验验证。在建立模式和数值分析结果的背景下，讨论了在输入脉冲持续时间与弹性波包穿过激光束的时间的不同比率下获得的输入和输出脉冲的波形图。利用AODL幅频特性的归一化实验曲线图确定截止频率，表明得到的截止频率与数值分析结果吻合较好。