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A fiber coupled LIBS system is used for detection of mines and explosives. Laser excitation at 1.5 mum is preferred to generate LIBS signals using an Er:glass microchip laser as seed laser for an Yb:Er fiber amplifier.
We describe a standoff sensor for monitoring, from above 3,000 m, the natural gas transmission pipeline infrastructure. Using an EDFA, the sensor amplifies the tunable diode laser beam from a Wavelength Modulation Spectroscopy platform.
Pulses from an ultrafast oscillator are conditioned, amplified, and delivered in an all-optical-fiber architecture. Combined with an electro-optic receiver, the complete system delivers a 4-V electrical trigger with less than 400 fs additive jitter.
A novel type of hybrid amplifier/wavelength converter is presented, coupling a TDFA and a FOPA module in series. Signal amplification over the entire S-Band (1450-1530 nm) and signal-to-idler conversion from 1540-1630 nm is demonstrated.
Powerful ultrashort pulses are generated using a hybrid MOPA consisting of a passively mode-locked semiconductor laser and a Yb-doped fiber amplifier. Pulses 2 ps in duration are amplified to an average power of 0.8 W.
A cladding-pumped, high-power amplifier was built incorporating a star-shaped, Ybdoped filter fiber. Pulsed amplifier measurements demonstrate strong suppression of stimulated Raman scattering accomplished by a special index profile with an up-doped ring.
In the pulse application, a significantly increased efficiency of high power largemode area fiber amplifiers is demonstrated by improving the overlap of the doped region with the fundamental mode of the fiber.
Heating a photo-darkened ytterbium fiber causes a recovery in spectral transmission to the pre-darkened state. Exposure to H2 at high temperatures causes a permanent change in the visible transmission identical to that caused by photo-darkening.
We report a high power diode-pumped mid-IR fiber amplifier at 2.7 mum. 4.6 W amplified signal was obtained for an input signal of 110 mW, corresponding to a net gain of 16.2 dB.
A cost-effective all-optical 2R regenerator, comprising a compact self-seeded Fabry-Perot laser diode, and a bidirectional EDFA, is proposed. This module, with 10.2-dB gain, achieves 6.4-dB power-penalty improvement over the 1R regenerator in the 100-km transmission.
We have derived an explicit analytical expression for the gain of a Brillouin fiber amplifier operating in the depleted pump regime. The accuracy of the obtained formula is validated both numerically and experimentally.
Employing all-optical means to prepare phase-coherent input signal-idler pairs, we implement a multichannel in-line phase-sensitive fiber-parametric amplifier. Feasibility of three-channel operation using a single pump is demonstrated.
We report on the quality of ultrashort pulses that are generated by a chirped pulse fiber amplification system when different pulse shapes are amplified. We focus thereby on sech2, parabolic and experimental parabolic pulse shapes.
Benefits provided by a new high-power and low-noise laser for efficient first-order Raman co-pumping are experimentally investigated. 8 times 10 Gb/s WDM channels have been successfully transmitted over 70dB of standard single-mode fiber with realistic system margins.
The composition-spread approach provides a means for evaluating the maximum photoluminescence in new systems of erbium-containing oxides. Hundreds of combinations of zinc-, bismuth-, gadolinium-, and aluminum-substituted SiO2 are evaluated; the Er:Zn-Ge-Si-O system is particularly promising.
Using an accurate full-vectorial finite element method, a realistic model of a fabricated dispersion compensating photonic crystal fiber is analyzed. An almost flat Raman-gain spectrum (gain-ripples at just plusmn0.48-dB) is obtained using a single pump.
We have demonstrated a polarization-interleaved WDM system with a two-orthogonal-pump OPA (2OP-OPA). The sensitivity has been improved by about 2 dB compared to its counterpart with all WDM channels co-polarized with the same signal gain.
We review high power and high energy ultrafast fiber amplifiers. An Yb-fiber chirped pulse amplification system employing cubicon pulses producing sub-650 fs pulses at >100 muJ and >15W is presented.
All-fiber chirped-pulse amplification based on a large-mode-area Er:Yb-doped photonic-crystal fiber is presented. A dispersion-variable hybrid fiber stretcher compensates the peculiar dispersion of the hollow-core photonic-bandgap fiber compressor yielding transform-limited 440-fs pulses with 1-W average power.
We propose a novel design for making the gain of single-pump, fiber-optic parametric amplifiers polarization independent. We show that under suitable conditions, signal gain varies by < 0.1 dB as its polarization varies.
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