Abstract

The characteristics of an acoustooptic (AO) Bragg cell of two-color radiation as a differential spatial-frequency filter, in which the first diffraction order is the working one, have been investigated. It is shown that in a general case, it is impossible to provide two-dimensional image differentiation simultaneously at two wavelengths. A regime has been found that allows one to change from one wavelength to another with preservation of the two-dimensional differentiation operation by adjusting the sound power. This variant has been confirmed experimentally by the formation of a two-dimensional contour using two-color radiation of an Ar laser at wavelengths of 0.488 × 10^–4 and 0.514 × 10^–4 cm, as well as a TeO₂ AO cell that operates at a sound frequency of 51 MHz.

中文翻译：

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一阶衍射级双色辐射声光空频滤光片

摘要

已经研究了作为差分空间频率滤波器的双色辐射声光 (AO) 布拉格单元的特性，其中第一衍射级是工作级。结果表明，在一般情况下，不可能在两个波长上同时提供二维图像微分。已经发现了一种机制，允许通过调整声功率从一个波长改变到另一个波长，同时保留二维微分运算。通过使用波长为 0.488 × 10 ^–4和 0.514 × 10 ^–4 cm的 Ar 激光的双色辐射以及 TeO ₂ 声频为 51 MHz 的 AO 单元。