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article
Passively Q-switched Tm3+, Ho3+-doped silica fiber laser using a highly nonlinear saturable absorber and dynamic gain pulse compression
Abstract
<p>We demonstrate a compact core-pumped 2 μm Tm<sup>3+</sup>, Ho <sup>3+</sup>-doped all-fiber laser passively Q-switched with an antimony-based saturable absorber. The 20 ns pulses are the shortest Q-switched pulses from a fiber laser operating beyond 1850 nm and were produced at a repetition rate of 57 kHz and pulse energy of 15 μJ using a short-length (4 ns) cavity. The large absorber modulation depth of ∼70% together with transient gain compression is shown to provide an efficient mechanism for Q-switched pulse shortening.</p>