title: Kilowatt-peak-power, single-frequency, pulsed fiber laser near 2 μm.
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.
authors.affiliation: AdValue Photonics, 3708 East Columbia Street, Suite 100, Tucson, Arizona 85714, USA. jgeng@advaluephotonics.com
authors.forename: Jihong
authors.initials: J
authors.lastname: Geng
authors.forename: Qing
authors.initials: Q
authors.lastname: Wang
authors.forename: Zack
authors.initials: Z
authors.lastname: Jiang
authors.forename: Tao
authors.initials: T
authors.lastname: Luo
authors.forename: Shibin
authors.initials: S
authors.lastname: Jiang
authors.forename: Gregory
authors.initials: G
authors.lastname: Czarnecki