Patent ID: 8461751
Filing Date: 2013-06-11
Classification: H01J,Y02B

Abstract:
1. A light source to be powered by microwave energy, the source having: a body having a sealed void therein, a microwave-enclosing Faraday cage surrounding the body, a fill in the void of material excitable by microwave energy to form a light emitting plasma therein, and an antenna arranged within the body for transmitting plasma-inducing, microwave energy to the fill, the antenna having: wherein: the body is a solid plasma crucible of material which is lucent for exit of light therefrom, the plasma crucible is contoured with a contoured surface to reflect light internally within the lucent crucible material to exit in a particular direction, the Faraday cage is at least partially light transmitting for light exit from the plasma crucible in the particular direction, the Faraday cage including: the arrangement being such that light from a plasma in the void can pass through the plasma crucible and either pass directly from it via the cage or pass indirectly from it via the cage after reflection at the contoured surface.