US 2014/0197729 A1 · PLASMA LIGHT SOURCE

Abstract

A lucent waveguide plasma light source has a quartz waveguide body with a central through bore. The bore has orifices at its opposite ends, opening centrally of flat, end faces of the body. Between these the body has a circular cylindrical periphery. A drawn quartz tube is inserted into the body. The tube has its one end closed and a collar which locates the tube in the bore and is fused to the faces at the orifices of the bore. The tube is evacuated and charged with excitable material and closed as a sealed void. A Faraday cage and an antenna in a bore in the body are provided for feeding microwave energy to the light source. When powered with microwaves, resonance is established in the wave guide and a plasma is established in the void, wherein Light radiates and leaves the waveguide and Faraday cage radially of the periphery.

Claims22

Dependent claims

A lucent waveguide plasma light source, having:

a fabrication of solid-dielectric, lucent material, having;
a closed void containing electro-magnetic wave, normally microwave, excitable material;
and
a Faraday cage:
delimiting a waveguide,
being at least partially lucent, and normally at least partially transparent, for light emission from it,
normally having a non-lucent closure and
enclosing the fabrication;
provision for introducing plasma exciting electro-magnetic waves, normally microwaves, into the waveguide;
the arrangement being such that on introduction of electro-magnetic waves, normally microwaves, of a determined frequency a plasma is established in the void and light is emitted via the Faraday cage, and wherein the fabrication includes:
a lucent waveguide body having a bore and
a lucent tube in the bore, the tube providing the closed void and the tube having:
a first closed end and a second closed end and
a fusion between the body and the tube at an orifice of the bore at or close to the first closed end of the tube
wherein the void extends at least to the fusion between the body and the tube at the orifice of the bore.

12 more elements

Dependencies are inferred from the claim text.

Plasma light source

Life of this patent

Plasma light source

Life of this patent

Abstract

Claims22