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A short pulse (30 ps) Nd3+ laser has been used to study the spectrum of second-harmonic emission from a laser produced plasma over a wide range of irradiances. Significant deviations from existing theory are observed and these are tentatively explained by considering the heat-front velocity. The evolution of the spectrum is followed both with and without a prepulse and considerable differences between the two are noted.

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A laser laboratory prototype for laparoscopic, endoscopic or angioplastic surgery was developed, incorporating an Er:YAG laser as the therapeutic tool in endoscopic/laparoscopic surgery and angioplasty and a N2 laser induced fluorescence system in order to monitor the surgical process. Aditionally, a laser radiation transmission system with waveguides and fibers was developed, to transmit the laser radiation, through an endoscope or laparoscope. The system was used in in vivo animal trials, giving promising results for the application of the device in semi-operative applications, in combination with systems of improved endoscopic imaging.