Projection keyboard
The laser keyboards use laser and infra-red technology to create the virtual keyboard and to project the hologram of a keyboard on a flat surface.
laser
Longitudinal Excitation Nitrogen Laser
A Longitudinal Excitation Nitrogen Laser design, using a fridge pump for vacuum and N2 from air as lasing medium.
100mW Burning Red Laser
This is about lasers, a short article where I speak about a 100mW red laser that I’ve recently built. Lots of interesting photos included.