AI Article Synopsis
- Generated single-frequency pulses at kilowatt peak power from an all-fiber Tm-doped system, marking a first in the 2 μm laser region.
- Observed spectral broadening by a factor of 3 in the amplified pulses due to self-phase modulation in accompanying passive fibers.
- Short pulse width of ~7 ns prevents stimulated Brillouin scattering, enabling significant nonlinear spectral broadening in single-mode fiber, which aids in generating mid- and long-wavelength infrared supercontinuum.
Article Abstract
We generated single-frequency pulses at kilowatt peak power from an all-fiber Tm-doped master oscillator power amplifier system, which is the first report of this kind (to the best of our knowledge) of a laser in the 2 μm region. Compared with the laser linewidth of seed pulses, spectral broadening by a factor of 3 was observed with the amplified pulses. This was attributed to self-phase modulation in passive pigtail fibers of the components (isolator and wavelength division multiplexing) that were placed after the fiber amplifier. The short pulse width (~7 ns) of the kilowatt-level pulses prevents an onset of stimulated Brillouin scattering in the long fiber. When launching the pulses into several-meter single-mode fiber, significant nonlinear spectral broadening occurs due to modulation instability in the fiber. This reaction is beneficial for generation of a mid- and long-wavelength IR supercontinuum in nonlinear IR fibers.
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| http://dx.doi.org/10.1364/OL.36.002293 | DOI Listing |
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