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提供一种不用透镜观察分数傅里叶变换的方法。给出其理论依据、实验示例及实验比较。这种方法既能解决没有合适透镜的情形，又具操作简单、精度高、范围宽等特点
A method of observing a fractional Fourier transform without a lens is provided. Given its theoretical basis, experimental examples and experimental comparison. This method not only can solve the situation without suitable lens but also has the advantages of simple operation, high precision and wide range