[en] Research citations covering 112 kinetic and energy transfer processes, design, and performance of gas and chemical lasers relying on gas dynamic effects for lasing enhancement are presented. Diffusion and flow studies specifically applicable to such lasers are also included

No abstract available

[en] A gas dynamic laser having high temperature high pressure gas produced from combustion is expanded in a first nozzle to provide a population inversion in a first cavity from which laser energy is extracted. The gas is then passed through oblique shocks to compress the gas slightly after which heat is added to obtain major compression. The gas is then expanded in a second nozzle structure to provide a population inversion in a second cavity from which laser energy is extracted. The gas is again passed through oblique shocks to decelerate the flow slightly after which the gas is passed through a subsonic diffuser for release to the atmosphere. (auth)

No abstract available

[en] This invention relates to a laser system of rugged design suitable for use in a field environment. The laser itself is of coaxial design with a solid potting material filling the space between components. A reservoir is employed to provide a gas lasing medium between an electrode pair, each of which is connected to one of the coaxial conductors

[en] A gas dynamic laser wherein the lasing fluid is recirculated in a closed loop is described. The flow can be assumed to start with the lasing gas passing through a cascade of supersonic nozzles. This low pressure, high velocity gas is then passed through a lasing cavity where the lasing action takes place. The energy of the high velocity gas stream is converted back to static pressure in a supersonic diffuser. The diffuser is constructed with (1) variable geometry, and (2) provisions for bleeding off the boundary layer for improved efficiency. Downstream of the supersonic diffuser there is a heat exchanger which partially cools the gas in the loop. This partially cooled gas is then supplied to a compressor where the pressure and temperature are raised back to the level at the start of the flow. The lasing gas is directed from the exit of the compressor to a manifold upstream of the cascade of supersonic nozzles. The compressor only supplies a pressure rise equal to the pressure loss by inefficiencies in the nozzle, the supersonic diffuser and the pressure drop in the heatexchanger and plumbing. To provide for cooling of the compressor, the gas bled from the diffuser is cooled by a second heat exchanger and pumped back to compressor inlet pressure and introduced into the compressor for cooling. In steady state operation, both heat exchangers referred to above, are designed to regulatethe nozzle inlet gas temperature by removing the amount of heat energy added by compressing minus the amount of energy extracted in the lasing beam and energy lost to the environment. The compressor and pumping means for cooling the compressor can be driven by any means desired. (U.S.)

[en] A high power gas dynamics laser device having multiple expansion-diffusion stages for gas flow and multiple reflection optic having a plurality of passes for the generation of laser power is described. The gaseous working fluid is provided by a combustion system. The combustion products are expanded through nozzles to obtain a population inversion and then a diffuser is used to recover the dynamic pressure. The gas flow follows four stages, the first three stages are single expander-diffuser units in series and the fourth stage is a larger sized stage having flow in two parallel expander-diffuser units. The nozzles of the first three stages are sized and contoured to obtain pressure in their laser cavities which are as equal as possible and the nozzle exit Mach. no. is made approximately equal. (U.S.)

[en] A gaseous laser having internal optical resonator mirrors and provided with a multiple-part resonator mirror adjustment is described. (U.S.)

No abstract available

[en] Long pulse (200 ns) XeCl excimer laser emission (lambda = 3,080 A), has been obtained when Ne/Xe/HCl mixtures are excited by an electron beam and X ray assisted discharge either at room temperature or at very low temperature. Absorbed discharge energy is several orders of magnitude higher than the absorbed beam energy. Maximum specific laser energy is 3 J/l at room temperature for a 16 cm gain length and an absorbed discharge energy of 150 J/l