Real money from non-real stuff: The business of virtual goods Lasers have been with us for 50 years. The first lasers were gas and solid state lasers (such as ruby laser) which were bulky.
Quantum cascade laser – a novel light source Lasers have been with us for 50 years. The first lasers were gas and solid state lasers (such as ruby laser) which were bulky.
50 years on, the laser shows no sign of retiring Technologies are invented, developed and retired. For example, the venerated vacuum tube family has almost retired. Its last member, the cathode ray tube, is holding out as computer and TV displays and will be replaced soon.
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