Define Wall Plug Efficiency?
The wall-plug efficiency of a laser system is its total electrical-to-optical power efficiency. Though the electrical power consumed should include all the electrical instruments like the chillers and re-circulation systems required for a cooling system, however, the convention is to take into account only the electrical power required for running flash lamps or laser diodes, which are used for pumping the gain medium. It is understandable that diode pumped solid state lasers have much higher wall-plug efficiency as compared to flash lamp pumped lasers.
