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-μsec bursts of short periodic pulsations typically 5 nsec 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.
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Gilbert et al. (1971) studied this question.
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