Abstract
We demonstrate a passively Q-switched erbium-doped fiber laser using a carbon-nanotube-based saturable absorber via evanescent field interaction. The carbon nanotubes are deposited on a side-polished fiber by optically-driven deposition method. Since only the evanescent field of the propagating light interacts with carbon nanotubes in saturable absorber, the fiber laser can maintain a relatively high intra-cavity power and output pulses with energy of 81.3nJ are obtained with a repetition rate of 70.4kHz and a pulse width of 4.5μs.
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