Optical diffraction patterns and almost-holograms made with a MOPA laser engraving machine

I use a Cloudray MOPA fiber laser to make diffraction gratings, multi-color images from bitmaps, and almost-holograms on stainless steel sheets. I inspect the gratings with an electron microscope, and also create images made from diffraction grating "pixels" where each pixel has controllable pitch and angle. Machine featured in the video: Cloudray GM-100 NEO — https://www.cloudraylaser.com/products/cloudray-litemarker-gm-series-neo-100w-autofocus-mopa-fiber-laser-engraver-with-built-in-camera