Some of the most striking things a laser makes are the ones that glow. There are two main approaches.
Wooden lightboxes and shadow lamps
Here the light source sits inside a box made of thin wooden panels. Wherever the laser has cut through, light escapes; wherever it has only engraved, the panel stays solid and shows a darker drawing. Switched off, the lamp is a carved wooden object. Switched on, the openings become a glowing scene — a moon, windows, flames, a forest. Many designs also throw patterned shadows onto the walls around them.
Making one well is mostly about design: openings must be large enough to glow but leave enough wood to keep the panel strong, and the panels must fit together precisely, which is where accurate kerf allowance matters.
Edge-lit acrylic
The second technique uses clear acrylic. Light shone into the edge of a clear sheet stays trapped inside it, bouncing between the two surfaces, so the sheet looks almost empty. Wherever the surface has been engraved, that trapped light scatters out — and only the engraved drawing lights up. This is how LED signs, desk plaques and many glowing keychains work: a small LED strip or module in a base or frame, and an engraved acrylic panel on top.
The light source
Modern laser lamps almost always use LEDs: they run cool, last for thousands of hours and can change colour. Low-voltage USB power keeps them simple and safe for a bedside table or desk.
Smaller laser-made pieces have their own tricks — see keychains, earrings, coasters and tags.
Photo: Snapmaker / Unsplash
More about laser making