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Laser action at 10.6 micrometers has been achieved in CO2-N2-He gas mixtures at all pressures up to atmospheric by means of fast electrical discharges transverse to the laser axis. The atmospheric pressure of operation is very promising as the laser energy per pulse increases with pressure and the average power per unit volume is proportional to the square of the operating pressure. A brief description of a simple laser of this type, operating at atmospheric pressure is given along with some of the major achievements to date using this technique. (Author).
The design parameters of a transversely excited atmospheric pressure CO2 laser using 1000 ohm ballast resistors are determined from a series of energy measurements. Peak powers of the order of 1 MW/sq cm at the output window are achieved while the efficiency ranges from 3 to 5% (plus or minus 0.3). Improvements based on geometrical and electrical considerations are also suggested. (Author).
The recent development of CO2 Transverse Excitation at Atmospheric Pressure (TEA) lasers has generated expanding interest and success due to their high pulsed power capabilities and simplicity of construction. The authors therefore decided to construct a CO2 TEA laser because of the need for a high powered, pulsed, coherent radiation source with wave length near 10 microns to conduct absorption studies of laser-induced plasmas. It was decided that the constructed laser should have an output energy per pulse between 10 to 50 joules with a pulse time between 0.1 to 1.0 microseconds. This paper deals with the construction of that laser, and includes a discussion of the background and physics of operation of the CO2 TEA laser. (Author).
The dynamical processes responsible for laser emission in the pulsed pumping of a transversely excited atmospheric (TEA) CO2 laser are investigated. An explanation for the formation of the giant pulse is proposed on the basis of a gain-switching mechanism in which it is assumed that with short strong-current pulses a high population inversion can be achieved prior to the onset of laser action. The kinetics of the mechanism are described by means of a set of nonlinear rate equations idealized to a four-energy-state system. With suitable initial conditions on the populations, the transient solution of these equations for the mixtures CO2-He and CO2-He appears to be consistent with the major features of experimental observation. (Author).
A mode-locked CO2 laser with transverse pulse pumping has been developed which employs a Ge ultrasonic diffraction cell as an active loss modulator. This paper describes the initial stage of an effort to exploit the broad bandwidth (about 5 GHz) of the CO2 laser transition and the high concentration of active gas at atmospheric pressure for generating ultra-short intra-red pulses at 10.6 micrometer wavelength. With the laser system presently described, output pulses with typical durations of about 1 ns and peak powers in the multi-megawatt range have been obtained for the first time. (Author).