Patent ID: 6661174
Filing Date: 2003-12-09
Classification: H01J

Abstract:
A high intensity electrodeless lamp for producing visible light, comprising:a lamp bulb envelope composed of a single crystal sapphire tubing, the tubing being substantially without surface undulations and being formed by heating alumina above its melting point, the lamp bulb envelope having a substantially cylindrical shape and having an inner diameter of between 1 mm and 25 mm and an outer diameter of at least 2 mm, an inside wall of the lamp bulb envelope having a first grove proximate a first end of the lamp bulb envelope and a second end thereof opposite the first end; and two end sealing plates being composed of one of niobium and tantalum, each of the plates being fitted into a corresponding one of the first and second grooves, wherein a length of the lamp bulb envelope is such that it fits into a microwave cavity with the end sealing plates near opposite ends of the cavity, and wherein one of microwaves and energy is guided around the end sealing plates.