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Title: Pulse Delays and Gain Characteristics in TEA CO2 Lasers, Author: John Reid, Location: Thode A novel method is reported for studying the time-dependent gain and cavity losses in a TEA CO2 laser. The technique involves an investigation of the time delay of the onset of lasing with respect to the current pulse in such a laser. Detailed measurements of this time delay as both the laser gain and the cavity loss are varied, in conjunction with a simple theoretical analysis, permit the evaluation of parameters describing the time-dependent gain and the cavity loss. A refinement of the technique, using two amplifier tubes, allows an accurate measurement of the decay time of the gain. Thesis Master of Science (MS)

Title: Gain Saturation and Pulse Solutions for a CO2-HE T.E.A. Laser, Author: Terence Tricker, Location Thode The saturation behaviour of various gain models for the CO2-HE T.E.A. laser was investigated. The corresponding laser pulse shapes for an oscillating cavity were generated by computer and compared to experimentally observed output pulses. Good agreement is obtained for low gain using a simple two-level model but at high gain, vibrational coupling between levels must be included. Thesis Master of Engineering (ME)