闪耀光栅(blazed grating) 闪耀光栅是衍射光栅的一种，它不同于传统的透射光栅与反射光栅，而是用横截面为锯齿形的的结构来进行衍射。这样使得零级光与入射光处于法线对侧，而其他级光位于法线同侧。

A blazed grating – also called echelette grating (from French échelle = ladder) – is a special type of diffraction grating. It is optimized to achieve maximum grating efficiency in a given diffraction order. For this purpose, maximum optical power is concentrated in the desired diffraction order while the residual power in the other orders (particularly the zeroth) is minimized. Since this condition can only exactly be achieved for one wavelength, it is specified for which blaze wavelength the grating is optimized (or blazed). The direction in which maximum efficiency is achieved is called the blaze angle and is the third crucial characteristic of a blazed grating directly depending on blaze wavelength and diffraction order.