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用全息技术制造衍射光栅就是通过摄制点源的全息图而制造的光栅。大家知道,全息图所记录的是物光和参考光之间的干涉条纹,它相当于一个复杂的光栅。当物光和参考光均为点源时,其干涉条纹就有比较简单的规律,所得到的全息图可视作一个广泛意义下的光栅。
The manufacture of diffraction gratings using holographic techniques is accomplished by taking a hologram of a point source. We all know that the hologram records the interference fringes between the object light and the reference light, which is equivalent to a complex grating. When both the object light and the reference light are point sources, the interference fringes have a relatively simple law, and the hologram obtained can be regarded as a grating in a broad sense.