A typical diffraction grating has thousands of grooves per millimeter on the reflective surface of a plate that can be flat or curved. Different gratings cover various electromagnetic radiation ...

In particular, it is possible to obtain theoretical 100% diffraction ... boundaries give higher reflection losses (for unpolarized light). Here we give the equations for calculating the resolving ...

Sure, a hacker could make one if he or she put their mind to it. But make one out of a webcam, some cheap diffraction grating purchased off ebay and some scrap? Surely not. [Renaud] pulls off this ...