Abstract
Thulium-doped silica fiber proved to be a good solution for light generation near 2 μm. The lasers based on this gain medium were shown to be capable of producing high powers with a broad tuning range and have clear potential for ultra short pulse generation. These features make thulium a promising material for medical and LIDAR applications. Recent studies discover important parameters of thulium doped fiber [1], Particularly, the dependence of the emission efficiency on the doping level and transition cross section have been determined. Adding holmium as a co-dopant was shown to increase the pump absorption and to extend the thulium gain spectrum to longer wavelengths. The properties of host material and co-doping affect strongly the gain broadening and are used as an instrumental in designing the optical amplifiers, tunable and mode-locked laser systems. Earlier studies have shown that the type of laser transition may evolve across the gain bandwidth [2], In particular, it has been shown that the transient effects having the form of well-known relaxation oscillations with a characteristic frequency coreiax depend on the operation wavelength.
© 2007 IEEE
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