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

We report a unique all fiber-based single-frequency Q-switched laser in a monolithic master oscillator power amplifier configuration at ~1920 nm 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...

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Bibliographic Details
Published in:Optics letters 2011-09, Vol.36 (18), p.3575-3577
Main Authors: WEI SHI, PETERSEN, Eliot B, NGUYEN, Dan T, ZHIDONG YAO, CHAVEZ-PIRSON, Arturo, PEYGHAMBARIAN, N, JIRONG YU
Format: Article
Language:English
Subjects:
Exact sciences and technology
Fiber lasers
Fiber optics
Fundamental areas of phenomenology (including applications)
Laser optical systems: design and operation
Lasers
Optics
Other fiber-optical devices
Physics
Q-switching
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Summary:We report a unique all fiber-based single-frequency Q-switched laser in a monolithic master oscillator power amplifier configuration at ~1920 nm 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 2.75 kW with transform-limited linewidth.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.36.003575