An ytterbium-doped fiber laser at 1.1 um

摘要

A pulsed ytterbium-doped fiber laser is proposed and developed. A length ofsamarium-doped fiber was inserted into the laser cavity to induce passive Q-switching.The laser oscillated in the continuous wave, Q-switched mode-locked or Q-switchedregime depending on adjustment of the intracavity polarization controller and the pumppower. Q-switched pulses with a pulse energy of ~7.5 nJ and duration of ~70 ns wereobtained at a pump power of ~1500 mW, corresponding to a peak output power of ~106mW at an average power of 2 mW. The low output power was attributed to the lowcoupling efficiency of pump radiation into the cavity and the high cavity losses. Allresults were obtained at room temperature.