There is provided a light-emitting device capable of suppressing a decrease in a light emission amount. A light-emitting device including a container member including a ceramic package provided with a depressed portion serving as a discharge space, and a light transmitting member which is attached to the ceramic package via a joining layer formed of a joining material so as to close the depressed portion; an inert gas encapsulated inside the discharge space; and a couple of discharge electrodes which are disposed in the depressed portion of the ceramic package so as to be spaced from each other, the joining material including glass exhibiting a white color, and oxide ceramic powder.

There is provided a light-emitting device capable of suppressing a decrease in a light emission amount. A light-emitting device including a container member including a ceramic package provided with a depressed portion serving as a discharge space, and a light transmitting member which is attached to the ceramic package via a joining layer formed of a joining material so as to close the depressed portion; an inert gas encapsulated inside the discharge space; and a couple of discharge electrodes which are disposed in the depressed portion of the ceramic package so as to be spaced from each other, the joining material including glass exhibiting a white color, and oxide ceramic powder.

Disclosed is a lamp block comprising a lamp which is a glass tube having an internal final end and an external final end, wherein said internal final end ends with an electrode that fits directly into a connector placed on the machine into which said lamp is mounted and said external final end ends with an electrode to which a cable is connected, at least one portion of said cable being inserted in a key which is a hollow cylinder. Also disclosed is a laser apparatus suitable to house said lamp block and a method for extracting and housing said lamp block in said laser apparatus. In a preferred embodiment, said apparatus further comprise a system for electronic recognition.