Abstract
We experimentally demonstrate simultaneous Tm3+ passive Q-switched (PQS) and Ho3+ gain-switched laser operations at 1888.8 and 2021.2nm, respectively, in a single-cavity all-fiber laser. The PQS operation of the Tm3+ laser is based on the use of a high-concentration holmium-doped fiber as a fiber saturable absorber. Then the Tm3+ laser emission is used as a pulsed pump source to achieve Ho3+ gain-switched pulses. A high birefringence fiber optical loop mirror used as a spectral filter allows the tuning of both Tm3+ and Ho3+ laser emissions.
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