Abstract: An electrically excited gas laser includes coaxial hollow-cylindrical electrodes defining a discharge space between the electrodes. A resonator mirror is disposed at each respective end of the discharge space. At least one of the resonator mirrors forms an intersection line with a cylindrical surface being coaxial with the electrodes and the intersection line extends obliquely relative to the circumferential direction. The resonator mirrors form intersection lines with an axial plane of the electrodes and the intersection lines extend substantially at right angles to the axis. At least one of the resonator mirrors extends over only a portion of the circumference of the discharge space.

Abstract: The invention relates to a gas laser having a discharge tube, through which the gas flows in an aixal direction and to which high-frequency electrodes are fitted externally, and having a high-frequency generator. In order to obtain a simpler construction and the smallest possible high-frequency losses, it is provided that the power output stage (12) of the high-frequency generator is disposed in the housing (1) of the laser resonator (2, 7, 8) and is directly connected to the electrodes (9, 10) via impedance adaptation elements (11).

Abstract: The gas laser with high-frequency excitation exhibits a laser tube (1), to which at least one pair of electrodes (5, 6) for the high-frequency excitation is externally fitted, and at least one inlet connection (2) and one outlet connection (3) for the gas. In order to permit a shorter distance between the pair of electrodes (5, 6) and the outlet connection (3), it is provided that a disc (12) having a high dielectric constant is disposed on the tube (1) between the pair of electrodes (5, 6) and the outlet connection (3), which disc extends substantially perpendicular to the axis of the tube.

Abstract: A laser apparatus is disclosed comprising a resonator for emitting a laser beam, an assembly for circularly or elliptically polarizing the laser beam emitted from the resonator, a lens assembly for focusing the laser beam from the polarizer to a workpiece with the laser beam from the polarizer to the lens having an axis, and the resonator having a folding mirror assembly for linearly polarizing the laser beam with the resonator being positioned relative to the polarizer so that the plane of reflection of the mirror assembly is approximately 45 degrees relative to the axis.

Abstract: Gas flow laser, in particular a laser through which the gas flows transversely, or through which it flow rapidly in an axial direction, which possesses a main gas circuit embracing the resonator and a circulating pump, together with an auxiliary circuit for continuously bleeding-off, conditioning and reintroducing a partial stream of the gas. The cost of the auxiliary circuit is reduced by connecting it to the main circuit upstream and downstream of the circulating pump, so that the full delivery head by the circulating pump is available for operating the auxiliary circuit. The supply of fresh gas can be introduced independently of the auxiliary circuit.

Abstract: Defects in the sealings of closures are located and measured by rotating the sealed closure and directing a light beam to the sealed area. The light beam reflected from the sealing mass is compared to a prespecified rated value and any deviation resulting from the comparison results in actuation of an ejecting device for ejecting the defective closure from the testing station.