I am trying to create a line made from light projected from a lens / guide of some sort onto a surface from a few mm away.
I have used a laser, but comes with safety considerations, space to mount the optics, and a lot of fine tuning.
I was testing alternatives, and had some success using the fibre-optic effect of the edge of an acrylic sheet and some cheap LEDs.
Does a lens or light guide of the type shown below exist?
I am not worried about the "shape" or "geometry" of the acrylic light guide and open to suggestions based on what exists. I am new to optics and need to know where to start Googling! Thanks!