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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).
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).
Self-mode-locking of a cross-excited electrically pulsed CO2 laser has been observed and studied as a function of cavity length and operating pressure. The best results are achieved with a 2.2 meter cavity having an active length of 1.5 meters. At a pressure of 450 Torr three axial modes are locked to give a train of 5 nsec pulses. Shorter pulses on the order of 2-3 nsec are seen at higher pressures, but the modulation and pulse shape are not as reproducible. With longer cavities more axial modes are locked, resulting in a longer dead time between pulses; however, the pulse widths increase. This indicates that less of the bandwidth is utilized with closely spaced axial modes. (Author).
This book presents lectures and seminars given at a Summer School, organized by the International College of Applied Physics, on the physics and technology and the industrial applications of high-power gas lasers.