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提出了用全息透镜实现分数傅里叶变换，讨论了用全息透镜作为分数傅里叶变换元件的条件．用全息透镜来实现分数傅立叶变换，能更好地满足分数傅立叶变换对透镜的焦距变化要求．
A holographic lens is proposed to realize fractional Fourier transform. The condition of using holographic lens as fractional Fourier transform element is discussed. Using holographic lens to achieve fractional Fourier transform can better meet the Fractional Fourier transform lens focal length requirements.