CPC H01J 61/302 (2013.01) [H01J 61/025 (2013.01); H01J 61/35 (2013.01); H01J 65/04 (2013.01)] | 18 Claims |
1. A light emitting sealed body comprising:
a housing containing light-emitting gas in an internal space;
a first window portion provided to the housing and on which first light is incident, wherein the first light is laser light for maintaining a plasma generated in the light-emitting gas; and
a second window portion provided to the housing and from which second light is emitted, where in the second light is light from the plasma,
wherein at least one of the first window portion and the second window portion includes a window member made of a material containing diamond, and
at least one protective layer made of an inorganic material is formed at least on a surface of the window member on a side of the internal space.
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