220 μj monolithic single-frequency Q-switched fiber laser at 2 μm by using highly tm-doped germanate fibers

Wei Shi, Eliot B. Petersen, Dan T. Nguyen, Zhidong Yao, Arturo Chavez-Pirson, N. Peyghambarian, Jirong Yu

Research output: Contribution to journalArticle

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Abstract

We report a unique all fiber-based single-frequency Q-switched laser in a monolithic master oscillator power amplifier configuration at ∼1920nm by using highly Tm-doped germanate fibers for the first time. The actively Q-switched fiber laser seed was achieved by using a piezo to press the fiber in the fiber Bragg grating cavity and modulate the fiber birefringence, enabling Q-switching with pulse width and repetition rate tunability. A single-mode polarization maintaining large core 25 μm highly Tm-doped germanate fiber was used in the power amplifier stage. For 80 ns pulses with 20 kHz repetition rate, we achieved 220 μJ pulse energy, which corresponds to a peak power of 2:75kW with transform-limited linewidth.

Original languageEnglish (US)
Pages (from-to)3575-3577
Number of pages3
JournalOptics letters
Volume36
Issue number18
DOIs
StatePublished - Sep 15 2011

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ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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