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An investigation has been made of the spontaneous self-locking of axial modes in a transversely excited atmospheric (TEA) CO2 laser of helical geometry. Laser emission was found to consist of 0.5 microsec. bursts of short periodic pulsations typically 5 nanosec in duration with peak powers in the megawatt range. Reproducible pulsating patterns have been achieved with the use of SF6 acting as mode selector in the optical resonator. (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).
;Contents: High-repetition rate low-pressure laser; Spontaneous mode locking in TEA lasers; Negative saturation; Mode locking and cavity dumping; Parametric studies of the CO2 laser; Cross relaxation in a low-pressure CO2 cell; Instantaneous frequency measurement of the TEA laser.
Mode-locked oscillation is a major bottleneck in the generation of short, high-power laser pulses, for application in laser fusion, communications, or radar. The objective has been to attain a comprehensive understanding of the mode locking of lasers with specific application to high-pressure CO2 TEA lasers. Toward this end work has proceeded along both theoretical and experimental lines. A new theoretical approach was developed, applicable to both active and passive mode locking. Experiments on high-pressure CO2 lasers are in progress to substantiate the theoretical predictions. Results are summarized.
Observation of self mode-locked pulses with a rotating mirror Q-switched CO2 laser is reported. Pulses as short as 10 nsec, narrower than the normal CO2 linewidth limit, were obtained. The shortness of these pulses is attributed to saturation broadening of the pulse spectrum. (Author).