A ultraviolet irradiation apparatus includes: a first electrode block and a second electrode block located apart from each other in a first direction or located in an electrically-insulated state in the first direction; a recessed groove formed on a side surface of each of both the blocks; a first discharge lamp partially fitted into the recessed grooves formed in both the blocks and located across the both blocks; a power supply part for supplying electrical power to the first discharge lamp; a first current-carrying member electrically connecting the first electrode block and the power supply part; a second current-carrying member capable of electrically connecting the second electrode block and the power supply part at an electrical potential different from that of the first current-carrying member; and a light irradiation window for extracting ultraviolet light emitted from the first discharge lamp to outside.

A ultraviolet irradiation apparatus includes: a first electrode block and a second electrode block located apart from each other in a first direction or located in an electrically-insulated state in the first direction; a recessed groove formed on a side surface of each of both the blocks; a first discharge lamp partially fitted into the recessed grooves formed in both the blocks and located across the both blocks; a power supply part for supplying electrical power to the first discharge lamp; a first current-carrying member electrically connecting the first electrode block and the power supply part; a second current-carrying member capable of electrically connecting the second electrode block and the power supply part at an electrical potential different from that of the first current-carrying member; and a light irradiation window for extracting ultraviolet light emitted from the first discharge lamp to outside.

A light emitting sealed body includes: a housing containing light-emitting gas in an internal space; a first window portion which is provided to the housing and on which first light that is laser light for maintaining a plasma generated in the light-emitting gas is incident; a second window portion provided to the housing and from which second light that is light from the plasma is emitted; and a getter portion including a getter material and disposed in an irradiation region of the first light inside the housing.

A light emitting sealed body includes: a housing containing light-emitting gas in an internal space; a first window portion which is provided to the housing and on which first light that is laser light for maintaining a plasma generated in the light-emitting gas is incident; a second window portion provided to the housing and from which second light that is light from the plasma is emitted; and a getter portion including a getter material and disposed in an irradiation region of the first light inside the housing.

Provided are a gas treatment method and a gas treatment device that enable efficient treatment of a VOC-containing gas to be treated by using ultraviolet light with a main emission wavelength of 180 nm or less.

This method is a method for treating a gas to be treated containing a mixture of air and a substance that is a type of VOC and that is subjected to treatment by causing the gas to be treated to flow through a treatment space. A light source designed to emit ultraviolet light having a main emission wavelength of 160 nm to 180 nm is located in the treatment space, and the gas to be treated is passed through a gap with a separation distance of 10 mm or less from a light-emitting area of the light source at a flow velocity of 23 m/s or less.

An excimer lamp includes light-emitting gases containing krypton gas and chlorine gas in a sealing body composed of fused quartz glass having an absorption band at least in a wavelength band of 240 nm to 260 nm. An ultraviolet light irradiation device includes: an excimer lamp having light-emitting gases containing krypton gas and chlorine gas in a sealing body; a housing having an extraction part for extracting ultraviolet light emitted from an excimer lamp; and fused quartz glass disposed in the extraction part and having an absorption band at least in a wavelength band of 240 nm to 260 nm.

An excimer lamp includes light-emitting gases containing krypton gas and chlorine gas in a sealing body composed of fused quartz glass having an absorption band at least in a wavelength band of 240 nm to 260 nm. An ultraviolet light irradiation device includes: an excimer lamp having light-emitting gases containing krypton gas and chlorine gas in a sealing body; a housing having an extraction part for extracting ultraviolet light emitted from an excimer lamp; and fused quartz glass disposed in the extraction part and having an absorption band at least in a wavelength band of 240 nm to 260 nm.

A flame detector including an ultraviolet emitter configured to emit ultraviolet light at a strike voltage less than or equal to approximately 230 volts. A method of manufacturing an ultraviolet emitter for use in a flame detector, the ultraviolet emitter including a hermetically sealed, alkali rich, ultraviolet transmissive glass envelope, the method including: (a) wrapping an envelope exterior surface with a conductive material; (b) performing a first injection of at least one non-radioactive gas into the glass envelope at a first pressure; (c) applying a voltage bias to the glass envelope; (d) baking the hermetically sealed, alkali rich, ultraviolet transmissive glass envelope at a baking temperature for a baking duration of time; (e) cooling the hermetically sealed, alkali rich, ultraviolet transmissive glass envelope to a desired temperature; and (f) performing a second injection of at least one non-radioactive gas into the glass envelope at a second pressure.

A flame detector including an ultraviolet emitter configured to emit ultraviolet light at a strike voltage less than or equal to approximately 230 volts. A method of manufacturing an ultraviolet emitter for use in a flame detector, the ultraviolet emitter including a hermetically sealed, alkali rich, ultraviolet transmissive glass envelope, the method including: (a) wrapping an envelope exterior surface with a conductive material; (b) performing a first injection of at least one non-radioactive gas into the glass envelope at a first pressure; (c) applying a voltage bias to the glass envelope; (d) baking the hermetically sealed, alkali rich, ultraviolet transmissive glass envelope at a baking temperature for a baking duration of time; (e) cooling the hermetically sealed, alkali rich, ultraviolet transmissive glass envelope to a desired temperature; and (f) performing a second injection of at least one non-radioactive gas into the glass envelope at a second pressure.

A system for forming a laser-sustained plasma includes a gas containment element, an illumination source configured to generate pump illumination, and a collector element configured to focus the pump illumination from the pumping source into the volume of the gas mixture in order to generate a plasma within the volume of the gas mixture that emits broadband radiation. The gas containment element may be configured to contain a volume of a gas mixture including a first gas component and a second gas component. The second gas component suppresses at least one of a portion of the broadband radiation associated with the first gas component or radiation by one or more excimers associated with the first gas component from a spectrum of radiation exiting the gas mixture.