an ytterbium-doped fiber laser at 1.1 um
abstract
a pulsed ytterbium-doped fiber laser is proposed and developed. a length of
samarium-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-switched
regime depending on adjustment of the intracavity polarization controller and the pump
power. q-switched pulses with a pulse energy of ~7.5 nj and duration of ~70 ns were
obtained at a pump power of ~1500 mw, corresponding to a peak output power of ~106
mw at an average power of 2 mw. the low output power was attributed to the low
coupling efficiency of pump radiation into the cavity and the high cavity losses. all
results were obtained at room temperature.
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