Abstract
Continuous-wave and Q-switched lasing from a codoped tellurite fiber is reported. An -doped silica fiber laser operating at was used as an in-band pump source, exciting the ions into the level. Energy is then nonradiatively transferred to the upper laser level, the state of . The laser transition is from the level to the level, and the resulting emission is at . For continuous wave operation, the slope efficiency was 62% and the threshold ; the maximum output demonstrated was . Mechanical Q switching resulted in a pulse of energy and duration at a repetition rate of .
© 2008 Optical Society of America
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