Abstract: A mirror mount for a resonator mirror of a gas laser which is cost-beneficial and simple to manufacture is composed of a tube of easily-workable material, for example steel, and a mirror receptacle that has a coefficient of thermal expansion matched to that of the mirror being supported in the receptacle. The mirror receptacle has a holding region that embraces the resonator mirror and has a spacer region that defines the minimum distance of the mirror from the end of the tube, whereby the mirror receptacle is deformable in a radial direction so that stresses caused by temperature fluctuations will not produce any damage to the mirror.

Abstract: A gas laser oscillating unit comprises: an electric discharge tube 1 for generating an electric discharge which is to be used as a laser excitation source for laser gas flowing in one direction 17 between an anode 3 and a cathode 2 which are made of a metal material and located at both ends of the electric discharge tube 1, a tube member 22 having a pair of slits 21 for generating a swirl of laser gas upstream of the cathode 2, and a tapered hollow member 23 having a tapered inner surface 23a for squeezing the laser gas stream. The cathode 2 is connected with the tube member 22 through the tapered hollow member 23. At least the inner surface of each of the tube member 22 and the tapered hollow member 23 is made of an alloy material containing aluminum and is processed to form a black alumite layer 31 thereon, wherein the black alumite layer 31 is made from an inorganic material.

Abstract: The gas enclosure of this laser includes a reservoir but no gas exhaust port--or valve leading to such a port or to ambient. Preferably the enclosure is sealed by an essentially permanent-type seal such as a glassblown seal, and connects with no pump, or valve leading to a pump. System life, in intermittent use or low-repetition-rate continuous use, is over a year without gas replenishment. Opposed metal coatings on the exterior of a discharge capillary tube form preionization electrodes, each extending nearly the entire capillary-tube length. These electrodes are energized to establish a transverse discharge inside the capillary tube, with good uniformity of initial ion density along the capillary tube. The electrodes couple to this discharge capacitively, through the capillary-tube wall, thereby isolating electrode materials against chemical reaction with corrosive gases in the system.

Abstract: A laser tube for a gas laser that has on at least one end side a tube flange for the detachable fastening of a laser window or of a laser mirror. The laser tube has a first adjusting flange that is gastightly mounted on the tube flange, an elastic tube-shaped element, in the interior of which the laser beam extends, and which is gastightly connected with the adjusting flange. On its other end, the tube-shaped element is gastightly connected with a second adjusting flange at which a mirror flange is gastightly mounted which carries the laser window or the laser mirror. Between the two adjusting flanges, at least two adjusting screws and at least one element which generates a restoring force are inserted.

Abstract: A discharge-excited laser apparatus includes a pair of discharge electrodes extending in a direction of an optical axis; a plurality of charging capacitors charged by a power source; a plurality of peaking capacitors arranged in parallel in a longitudinal direction of the discharge electrodes and receiving energy accumulated in the charging capacitors; and a plurality of semiconductor switches arranged with conductive plates in the longitudinal direction of the discharge electrodes and connected in series and in parallel to the peaking capacitors. The construction of the semiconductor switches enables uniform shift of the energy in the charging capacitors to the peaking capacitors and reduction of inductance of a loop for capacity shifting.

Abstract: A high temperature laser solenoid incorporates a combination of thermally and electrically insulating components to replace and to exceed the operating limits of epoxy encapsulation which solenoid is used in cooperation with a mechanically driven cooling air flow. The solenoid construction includes a layer of high temperature resistant, electrical insulation assembled on an aluminum bobbin adapted for coil winding so as to create a solenoid. High temperature insulated magnet wire is wound into a coil on the bobbin and the coil is covered with an additional high temperature resistant, electrically insulating film layer. Wire leads are passed through notches formed through the insulation barrier and the bobbin flanges and the solenoid is covered by an intimately contacting preformed heat conductive tubular casing.

Abstract: There is prevented mirrors from being misaligned owing to a thermal expansion difference caused by temperature distribution along constituent portions of an argon ion laser supporting the mirrors to improve the stability of a laser output. For this purpose, a member having a thermal expansion coefficient to cancell a thermal expansion difference is joined with any of portions of the cathode bulb supporting the mirrors both constituting an optical resonator, said portions demonstrating a temperature difference.

Abstract: A pulsed gas-discharge laser, in particular an excimer laser, comprises main discharge electrodes (10, 10a) of erosion-resistant metal between which laser gas flows with high velocity to replace the laser gas between the main discharge electrodes from laser pulse to laser pulse. For preionizing the laser gas two X-ray radiation sources (30, 30a) are arranged adjacent one main discharge electrode (10). The flow path (18) of the laser gas is formed partially by flow bodies (16, 16a, 32, 32a) which consist of a material which has a high secondary emissive power with regard to the X-ray radiation. The secondary radiation is so configured that it promotes the preionization.

Abstract: An apparatus for preionization of gas in a pulsed gas laser by means of soft X-ray radiation comprises an elongated cathode (26) which is heated by thermal radiation or electron bombardment and which is arranged parallel to a likewise elongated anode (18) in an evacuated housing.

Abstract: High-frequency-excited laser for high input powers, particularly a CO.sub.2 stripline laser. For supplying high-power high-frequency energy to a laser, a matching unit (2) for the impedance is integrated in the laser, whereby the matching unit (2) contains a L-C element, whereby the inductance L and the capacitance C are variable, whereby the inductance can be set on the basis of variation of the length of the voltaicly conductive parts of a high-frequency feed and of a high-frequency conductance, whereby the capacitor is constructed of an outer conductor (10) and of an inner conductor (3) coaxial thereto, and whereby a coaxial slide ring (27) externally movable in an axial direction is in communication with the outer conductor (10). The slide ring (27) adjoins a dielectric cylinder (28) between the outer conductor (10) and the inner conductor (3), the outer conductor (10) carrying the inner conductor (3). The high-frequency-excited laser is provided for CO.sub.2 stripline lasers.

Abstract: In a gas laser apparatus including a gas laser tube having a plasma tube between a cathode electrode and an anode electrode, and a magnetic field generator for generating a magnetic field through the central hole of said plasma tube, the radius of the central hole is configured so as to avoid ion bombardment by confining the ionized plasma within the magnetic flux passing through the cathode electrode. For practical purposes the central hole is tapered, at least near the entrance thereof, with its radius larger than that of the magnetic flux entering the central hole, thereby substantially eliminating sputtering by ion plasma at the entrance end and on the inner wall of the plasma tube.

Abstract: In an axial flow gas laser, in particular a high-power CO.sub.2 laser with DC excitation, at least one discharge tube (1) of dielectric material, in particular quartz glass, is provided. First and second connection bodies (E1, E2) are sealingly connected to the discharge tube (1) or to connection necks branching off from it, in each case in the vicinity of an electrical and laser gas connection point, forming a connection chamber (K1, K2), and are connected to laser gas inlet lines (4) or outlet lines (9). The first connection body (E1) is connected to the anode potential and the second connection body (E2) to the cathode potential of a direct voltage source. The first and second connection bodies (E1, E2) are disposed with tubular axial spacing from one another, so that the discharge tube (1), with its gas chamber, forms a discharge path between the anode and cathode potentials.

Abstract: In a random polarization gas laser tube, a pair of mirrors constituting an optical resonator have anisotropic characteristics and aligned such that directions showing highest reflection intensity are orthogonal to each other to obtain a stable polarizing characteristics.

Abstract: A gas laser apparatus having transparent laser windows provided on a laser chamber body, in which operating gases is sealed if necessary, comprising circulation means connected to the laser chamber body through an intake port and a discharge port for circulating gases within the laser chamber body and filtration means disposed in said circulation means, further comprising cutoff means for preventing the laser windows from being stained and open and closeably cutting off between the laser chamber body and the laser windows, and having a construction wherein in replacing the laser window, the cutoff means is once placed in a cutoff state, and the laser window is separated from the laser chamber body to place the laser window.

Abstract: A gas laser includes an inner tube filled with gas and having mirrors at its opposite ends to define a resonant chamber, an outer tube filled with gas and defining a gas reservoir for the gas in the resonant chamber, and electrodes for energizing the gas in the resonant chamber. The gas reservoir includes a pair of intermediate tubes coaxial with and between the inner and outer tubes. One of the intermediate tubes is open at one end facing one end of the laser and is joined at its opposite end facing the opposite end of the laser to the outer tube. The other intermediate tube is open at its end facing the opposite end of the laser and is joined at its end facing the one end of the laser to the inner tube, whereby the pair of intermediate tubes divide the reservoir into a plurality of annular spaces defining a zigzag path between the opposite ends of inner tube.

Abstract: A saturable reactor comprising a magnetic core (1) having an annular or an elongated race-track configuration, an electrical insulator (6) disposed around the magnetic core and a conductor winding (3) wound around the insulator (6). A coolant duct (7) is provided in the insulator to extend radially transversely across the magnetic core and having a radially separated inlet and outlet (8,9). A saturable reactor may comprises an annular magnetic core (51), a conductor winding including a first conductor (55) surrounded by the magnetic core (51) and a second conductor (56) disposed around the magnetic core and connected to the first conductor (55) through a load. A control winding (54) extends through the first and second conductors (55,56), and at least one of the first and second conductors (55,56) has a notch or a through hole (57,59) for insulatingly receiving the control winding (54) therein.

Abstract: An apparatus and method of fabricating an tubular reflector for use in a laser. The tubular reflector is formed by first grinding smooth the inside surface of a round metal tube. The polished tube is inserted into an elliptical mold. The mold is then pressed to shape the round tube into an elliptical tube. Next the inner wall of the tube is coated with a highly reflective material. Finally, a light source and a laser rod are positioned in the tube such that after the light source is turned on, light is reflected off the reflective walls of the tube to the laser rod resulting in laser light emitting from the ends of the rod. It may also be preferable that the elliptical tube be formed by combining and bending two flat metal sheets.

Abstract: A heat conducting structure in a discharge tube of an ion laser, that has high resistance to erosion due to sputtering comprises a discharge limiting member having an inner aperture, and a thin film of refractory ceramic coating areas near the inner aperture. The thin film of ceramic does not significantly retard heat flow out of the discharge into the heat conducting structure, but significantly increases resistance of the heat conduction structure to sputtering.

Abstract: A gas laser apparatus includes an insulating material layer covering the outside of a pair of metal electrodes disposed on the outer peripheral surface of a dielectric discharge tube. The insulating material layer thus provided electrically separates the metal electrodes and prevents a dielectric tube which would otherwise occur through an air gap between adjacent portions of the metal electrodes when a high-frequency voltage is applied across the metal electrodes.

Abstract: Electrically pumped gas laser suitable for high input power. In such an electrically pumped gas laser suitable for high input power, damage in the region of the vacuum bushing for feeding electrical power to an electrode that can arise as a consequence of the heating of the feeder during operation is avoided in that the feeder is fashioned as a tube and proceeds through an insulating busing and in that this tube is permeated by coolant. The invention is suitable for gas lasers, particularly slab or stripline lasers.

Abstract: A novel gas laser apparatus is disclosed, which comprises a hermetic container with a gas laser medium sealed therein, a plurality of main discharge electrodes arranged in the hermetic container for causing the main discharge in the gas laser medium thereby to generate a laser beam, and a device for subjecting the discharge space between the main discharge electrodes to preionization over a wide range thereof before the main discharge by use of a reflected laser beam or an ultraviolet ray lamp.

Abstract: An electric discharge tube for a gas laser in which a laser gas flow axis and a laser oscillation optical axis are coaxial and a discharge direction of discharge pumping is perpendicular to those axes. The internal sectional form of a discharge tube (1) perpendicular to the laser oscillation optical axis is made rectangular and the internal diameter of nondischarge sections (10a, 10b) is made larger than the diagonal line of the discharge tube (1). The section of laser beams generated in a rectangular discharge region (11) becomes substantially rectangular in shape and the laser beams are externally output intact, whereby a substantially rectangular beam mode is obtained.

Abstract: The hollow guide is designed as a thin ceramic hollow tube which is guided in an outer tube while leaving a hollow space between the outer tube and the ceramic hollow tube, the outer tube being provided at its proximal end with a connecting part having a gas connection and receiving a focusing optical system. The ceramic hollow tube is guided in the outer tube through at least one mounting part arranged at the proximal end and at least one mounting part at the distal end, which in each case is supported locally with respect to the inner wall of the outer tube. The mounting parts are thus arranged so that free flow cross-sections to conduct the rinsing gas remain in the region of support, these being matched with the internal inner cross-section of the ceramic hollow tube, so that gas flow flowing past the ceramic hollow tube is produced both on the outside and on the inside.

Abstract: A discharge tube for a high-speed axial-flow type discharge pumping gas laser device is provided, in which a capacitive load medium (9) under metal electrodes (2a, 2b) has convexly curved faces opposed to each other and constitutes a discharge tube. With this construction, the distribution of a laser oscillation gain within the discharge tube (1) is made uniform, and a single-mode laser beam is obtained.

Abstract: Electrically excited stripline laser. In stripline lasers having high power density, a structure is provided wherein the resonator mirrors directly adjoin the stripline. An electrically insulating layer that has good waveguiding properties for the desired laser emission is arranged at least between a mirror and an excitation electrode. The stripline laser is suitable for stripline lasers having a high specific power.

Abstract: A sealed laser plasma tube for use in a gas laser system. A Brewster window seals one end of the tube (the cathode end, in a preferred embodiment), and an end mirror which seals the opposite tube end (the anode end, in a preferred embodiment). In a laser system embodying the invention, a second end mirror is positioned adjacent to, but spaced from, the Brewster window. Intra-cavity elements may conveniently be inserted and replaced in the region between the sealed Brewster window and the second end mirror. The sealed mirror which seals the tube end opposite the window is preferably coated with at least an outermost layer of Hafnium oxide, to protect it from hard UV radiation originating within the plasma tube. The inventors have recognized that the problem of sealed window degradation is substantially less severe at the cathode end of an ion laser plasma tube, and that the sealed window should be attached at the tube end at which the window degradation problem is less severe.

Abstract: A turbo blower for a laser device, including a shaft having an impeller on one end thereof, a pair of bearings, having inside grease spaces and supporting the shaft Non-contact seal portions are provided for preventing an outflow of grease, whereby other spaces for retaining the grease are formed on either side of the bearings. Although the grease in the inside spaces of the bearings is urged to escape from the bearings by the centrifugal force of the rotation of the shaft, the grease is prevented from flowing out of the spaces on either side of the bearing by the non-contact seal portions.

Abstract: A metal vapor laser has a discharge tube with electrodes at opposite ends. A power source is electronically connected to the electrodes and generates a discharge in a discharge region within the discharge tube. The discharge generates laser light which emerges from the tube via windows. In order to cool the apparatus, the discharge tube is surrounded by a cooling jacket in the form of a hollow cooling vessel. A liquid flows in the cooling vessel and removes heat. The space between the cooling vessel and the discharge tube is evacuated. The cooling vessel is conductive and, since it is connected between one of the electrodes and the power supply, its inner and outer walls provide two potential paths for return current. The fact that the inner and outer walls have different diameters means that the inductance of the return paths is large. Therefore, the outer wall has a gap in it filled with insulating material.

Abstract: A gas laser includes a housing containing a lasing gas. Means are provided for electrically exciting the gas including a cathode mounted at one end of the housing and an anode mounted at the other end. The temperature of the anode is monitored and a control signal is generated which is indicative of the temperature that is measured. An automatic gas supply apparatus is activated to vary the gas pressure in the housing in response to the control signal. Additionally, the temperature that is measured may be normalized to counteract the effects of the ambient temperature of the anode.

Abstract: A gas discharge tube for a gas laser includes a discharge chamber having a first end and a second end. A cathode is mounted near the first end in a cathode region of the discharge chamber and an anode is mounted near the second end. An electromagnet induces an axial magnetic field within the discharge region, and a pole piece is mounted on the end of the electromagnet adjacent the cathode region. By using a pole piece for attenuating the axial magnetic field in the cathode region, a significant reduction in 60-60 Hz modulation of the light beam is realized, as well as a reduction of sputtering in the throat region of the discharge tube, additionally, the cathode placement relative to the throat region may be optimized leading to an increase in plasma tube efficiency. In addition, a second pole piece is mounted on the end of the electromagnetic coil, adjacent the anode region, for attenuating the axial magnetic field inside the anode region after the discharge reaches the anode.

Abstract: At least one pair of electrodes (5a, 5b) are provided on the surface of a dielectric discharge tube (1), and radiating fins (2a, 2b) are attached to a part of the electrodes (5a, 5b). A ceramic clamp (3) and a stainless-steel backup plate (4) are engaged with recessed portions of the radiating fins (2a, 2b), to thereby fix the radiating fins (2a, 2b) in position. Accordingly, a rise in the temperature of the electrodes is reduced by radiating heat through the radiating fins, whereby a separation or deterioration of the electrodes (5a, 5b) is prevented.

Abstract: A device for high temperature heating including a container a filled with a buffer gas, two electrodes in the container that are fixed to the container, and an alternating current power supply coupled to the two electrodes through a leakage field transformer. The primary windings of the leakage field transformer are coupled to the alternating current power supply and the secondary windings of the leakage field transformer are connected to the electrodes in the container.

Abstract: A laser oscillator device comprises an electric-discharge tube for producing an electric discharge in a laser gas contained in the electric-discharge tube for laser excitation, an optical resonator for effecting laser oscillation, and a gas circulating device having a gas blower and a cooling unit for forcibly cooling the laser gas. The gas blower has an impeller that is rotatable in the laser gas and bearings that are lubricated by grease. With this arrangement, contamination of the optical parts is prevented and the device can easily be maintained.

Abstract: A compact RF excited annular laser system has a stable resonator with a high quality output beam. The stable resonator has internal axiconical and annular mirrors to conform with the annular lasing medium, and to convert the annular beam into a compact cylindrical beam. Mode control is achieved by a combination of diffractive effects in both the annular beam and the compact beam.

Abstract: A high-frequency discharge pumping laser device is provided in which a high-frequency voltage is applied to a discharge tube to cause laser excitation. Light discharged from the discharge tube is measured by a photodiode to control an output of a laser power supply, to thereby stably control the discharging operation when the laser output is zero. The laser output has a close relationship with the discharging area inside the discharge tube, and therefore, the discharging area in which the discharging operation can be stably maintained with the output of zero is detected, to thereby stably control the discharging operation when the output is zero. Further, the length of the discharging area has an indirect relationship with the ambient temperature of the discharge tube, and the discharging operation effected when the laser output is zero is stably controlled in accordance with the ambient temperature of the discharge tube.

Abstract: A disk, or heat web, is generally circularly shaped, and has a circumferential lip normal to the plane of the disk. A split ring, fabricated from a material having a low co-efficient of thermal expansion fits within the circumferential lip. A generally circularly shaped expansion member, made from a material having a relatively high coefficient of thermal expansion, fits within the split ring. A suitable brazing material is placed between the split ring and the circumferential lip of the disk. The heat produced by the brazing process expands the split ring and allows it to be brazed into place when the assembly is placed on the inside of the cylindrical member.

Abstract: Discharge tubes formed of metal fluoride gases are used in apparatus for emitting high frequency laser and fluorescent light. The discharge tubes are resistant to corrosion from halogen-containing gas mixtures subjected to high frequency excitation in the apparatus.

Abstract: A laser oscillator having an enclosure serving as a vacuum vessel which is capable of preventing an electric discharge from occurring between a pair of electrodes and the inner surface of the vacuum vessel. The laser oscillator is made smaller in size, lower in total weight, and lower in manufacturing cost while securing a sufficient insulation gap between the electrodes and the inner surface of the vacuum vessel.

Abstract: A gas laser housing having a housing and a metal cap attached thereto, includes a mirror mount attached to the metal cap. The mirror mount is provided with an annular region of reduced diameter affixed to the metal cap to absorb mechanical stresses and thereby prevents stress crack corrosion at the circumference of the housing tube.

Abstract: A laser employing a dispenser cathode is provided with a tubular enclosure surrounding that cathode. The tubular enclosure serves as a support for the bore and the optical chamber on either side of the dispenser cathode and is insulated from ambient temperature conditions by a ballast reservoir housed in a jacket encircling the tubular enclosure. The jacket has peripheral sidewalls spaced apart from the tubular enclosure. Lateral end walls connect the opposite extremities of the peripheral sidewalls in a sealing engagement to the exterior of the tubular enclosure. Communication between the interior of the jacket and the interior of the tubular support is afforded through an aperture formed in the tubular support at a location remote from the dispenser cathode. Leads for the dispenser cathode are disposed in a sealing engagement through the end walls of the jacket and enter the interior of the tubular support through the aperture formed therethrough.

Abstract: A gas laser is provided having a cathode which is essentially tubularly designed and surrounds an end of a laser capillary which faces toward it. The cathode has a tube termination which serves the purpose of protecting tube parts situated there behind from the plasma of the laser. It surrounds a beam passage opening which insures that the laser beam can pass through in unattenuated fashion. This beam passage opening can be made smaller and the shielding can thus be improved since an extension of the mount for the optical elements of the laser projects into the interior of the laser, and the cathode is fixed to the extension at least in a radial direction. The invention is particularly suited for helium-neon lasers.

Abstract: In a gas laser having a capillary and a cathode that envelopes the capillary, a fastening of the cathode suitable for batch soldering is achieved in that the cathode is secured to an end piece having a mount for an optical element, and an end of the cathode facing away from the end piece is elastically supported against a housing wall with such a slight spring power that a weight of the unit formed of the cathode, end piece, and mount is adequate for overcoming the friction between the spring and the housing wall. Thus, the end piece with the attached cathode can slide into its final position during soldering solely on the basis of the force of gravity. The invention is particularly suited for helium-neon lasers that are manufactured in glass solder technology.

Abstract: A laser is provided comprising a laser envelope and a gain medium disposed in the laser envelope. The gain medium comprises a compound subject to dissociation into a plurality of components. Circuitry is included for generating an electrical discharge in the laser envelope, a portion of the electrical discharge passing through the gain medium and disassociating a portion of the compound thereof into the plurality of components. The discharge generating circuitry comprises a cathode, the cathode comprising a first portion for emitting the electrical discharge toward an anode. Such first portion comprises a catalyst for aiding the recombination of the dissociated plurality of components. The first portion of the cathode sputters particulates therefrom during the electrical discharge and a surface is disposed within the laser envelope for collecting the sputtered particulates.

Abstract: The invention concerns a gaseous flux laser device. To enable the removal into the atmosphere of the exhaust gases of an N.sub.2 -CO.sub.2 laser while maintaining a sufficiently low pressure in the zone where the stimulated light emission occurs, the carbon dioxide is injected through supersonic nozzles and an exhaust tube having a sufficient length is used. Application to the generating of powerful coherent light beams.

Abstract: A discharge chamber is swept at high velocity by a gas discharge which burns as a steady-field discharge between an anode extending in the direction of flow and at least three single cathodes arrayed in tandem in the direction of flow. The discharge chamber is defined transversely of the direction of flow by sidewalls, the anode forming the one first sidewall and running parallel to the plane defined by the single cathodes. To achieve a long cathode life at maximum power input, and especially to achieve sufficient cooling of the downstream single cathodes, without the need for additional technical measures and components, the second sidewall defining the discharge chamber on the side facing the single cathodes continuously varies in distance from the opposite first sidewall and the anode in the area of the single cathodes.

Abstract: A gas laser has a closed gas flow channel in which a gas flows at high velocity through a discharge chamber, the gas discharge burning between at least two electrodes extending transversely of the gas flow. A cross-current blower for maintaining the gas flow has an axis of rotation which runs parallel to the optical axis and buckets are disposed substantially free-standing such that the gas stream flows twice through the bucket wheel, the delivery side of the blower being separated from the intake side at the inner wall of the gas flow channel by a baffle body extending in direction of the axis of the blower and reaching the outer edges of the buckets.

Abstract: In a gas laser whose housing is composed of metal caps and a hollow tube of glass or ceramic, whereby the parts are joined with a glass solder connection have a low melting temperature, i.e. with a glass solder that contains lead borate, a durable, vacuum-tight connection is guaranteed in that the metal cap is shaped such that its free edge approaches closer to the tube at at least certain locations than does an expanded portion of the metal cap lying back from the free edge, and in that the glass solder at least partially fills the space between the expanded portion and the hollow tube.

Abstract: A gas laser comprises an optical cavity, a coaxial transmission line at least partially disposed in the optical cavity, a lasant gas disposed in the cavity, and means for transmitting at least one electrical pulse progressively along the transmission line to generate a travelling wave of ionization to pump the lasant gas.

Abstract: A ring laser gyro having a triangular-shaped block design (10) includes a cathode (24,26) on each side leg of the triangular-shaped block and one anode (28) on the base leg of the triangular-shaped block. Furthermore, the anode (28) is connected via connecting bores (36,38) to gas reaming bores (30,32) in the corner points of the block in order to pass away ions and electrons of the plasma from mirrors (18,20) arranged in the corner points of the block.

Abstract: An axial flow gas transport laser comprising an excitation tube through which gas flows along an axis of the tube, an inlet arrangement to feed gas towards the excitation tube and an outlet arrangement to discharge gas from the excitation tube. At least one of the inlet and outlet arrangements comprises a circumferential opening arrangements evenly distributed along the periphery of the excitation tube, substantially in a cross-section plane of the tube. A gas flow channel arrangement to the opening arrangement is directed at least substantially in the direction of the excitation tube axis and into the excitation tube at the opening arrangement for preventing wide-areal turbulances of the gas flowing in the excitation tube.