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Tm 3 + Ho 3 + codoped tellurite fiber laser

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Abstract

Continuous-wave and Q-switched lasing from a Tm3+Ho3+ codoped tellurite fiber is reported. An Yb3+Er3+-doped silica fiber laser operating at 1.6μm was used as an in-band pump source, exciting the Tm3+ ions into the F43 level. Energy is then nonradiatively transferred to the upper laser level, the I75 state of Ho3+. The laser transition is from the I75 level to the I85 level, and the resulting emission is at 2.1μm. For continuous wave operation, the slope efficiency was 62% and the threshold 0.1W; the maximum output demonstrated was 0.16W. Mechanical Q switching resulted in a pulse of 0.65μJ energy and 160ns duration at a repetition rate of 19.4kHz.

© 2008 Optical Society of America

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