High power and high energy monolithic single frequency 2 μm nanosecond pulsed fiber laser by using large core Tm-doped germanate fibers: Experiment and modeling

Qiang Fang, Wei Shi, Khanh Kieu, Eliot Petersen, Arturo Chavez-Pirson, Nasser Peyghambarian

Research output: Contribution to journalArticle

51 Scopus citations

Abstract

We report a high power and high energy all-fiber-based single frequency nanosecond pulsed laser source at ∼1918.4 nm in master oscillator-power amplifier (MOPA) configuration. The pre-shaped pulsed fiber laser seed with a variable pulse duration and repetition rate were achieved by directly modulating a continuous wave (CW) single frequency fiber laser using a fast electro-optical modulator (EOM) driven by a arbitrary waveform generator (AWG). One piece of single mode, large (30 μm) core polarization-maintaining (PM) highly thulium-doped (Tm-doped) germanate glass fiber (LC-TGF) was used to boost the pulse power and pulse energy of these modulated pulses in the final power amplifier. To the best of our knowledge, the highest average power 16 W for single frequency transform-limited ∼2.0 ns pulses at 500 kHz was achieved, and the highest peak power 78.1 kW was achieved at 100 kHz. Furthermore, mJ pulse energy was achieved for ∼15 ns pulses at 1 kHz repetition rate. Theoretical modeling of the large-core highly Tm-doped germanate glass double-cladding fiber amplifier (LC-TG-DC-FA) is also present for 2 μm nanosecond pulse amplification. A good agreement between the theoretical and experimental results was achieved. The model was also utilized to investigate the dependence of the stored energy in the LC-TGF on the pump power, seed energy and repetition rate, which can be used to design and optimize the LC-TG-DC-FA to achieve higher pulse energy.

Original languageEnglish (US)
Pages (from-to)16410-16420
Number of pages11
JournalOptics Express
Volume20
Issue number15
DOIs
StatePublished - Jul 16 2012

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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