Two laser systems emitting at 2 and 3 micrometers have been developed for application in the biomedical field, such as photoablation and microsurgery. The design involved the evaluation of active materials, the optimization of pumping chamber and the analysis of different configurations of the resonant cavity. Holmium, Thulium and Erbium active ions in the YAG host have been considered. A complete characterization of the laser behavior has been carried out for the most interesting combinations of components. The Erbium laser has been also operated in Q-switch regime. The achieved results are comparable with the state of the art performances on the international market.
Alexandrite laser system which emits a wavelength of 750 nm has been recently proposed as a substitute for the pulsed-dye laser (504 nm) for laser-lithotripsy. We have carried out in vitro lithotripsy trials in order to evaluate the efficiency of a flashlamp pumped Q-Switched Alexandrite laser. The experimental system was performed by an alexandrite laser (Quanta-System Inc.), with a pulse energy between 40-80 mJ/pulse, at a repetition rate of 10-20 Hz; and a pulse duration of 250-300 nsec. This system permits the use of 320-500 micrometers fibers.
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