Abstract
In this paper, we demonstrated and compared several fibre-based saturable absorbers (SAs) used in the generation of stable Q-switched fibre lasers in the 1-micron region, using 1.5 m long Ytterbium-doped fibre (YDF) as the gain medium. The tested fibre SAs consist of four segments; (1) 8 cm long Hafnium bismuth erbium-doped fibre (HBEDF), (2) 12 cm long Ytterbium-doped fibre (YDF), (3) 20 cm long Titanium dioxide-doped fibre (TDDF) and (4) 11 cm long Thulium-doped fibre (TDF). The fibre segments were joint with a single-mode fibre (SMF28) of approximately 10 cm at both of their ends via fusion splicing to become useful fibre-based SAs. The Q-switched fibre lasers stably operated at ~1060 nm wavelength. Among these fibre SAs, the highest pulse energy (191 nJ) was achieved through the TDDF SA, while the shortest pulse width (1.97 ms) and the highest pulse frequency (74.2 kHz) were obtained via the YDF SA. These fibre SAs provide simple operation, high stability and high thermal damage threshold which are desirable for high power laser operations.
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