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By using two-section fiber where the first section has no spin and the second one is periodically spun, we demonstrate reduced polarization dependent gain and polarization mode dispersion in a distributed fiber Raman amplifier.
Guided acoustic wave Brillouin scattering (GAWBS) in PCFs is altered by the air-silica structure of the inner cladding and does not depend on the cladding diameter as with standard fibers. This dependence is investigated.
We realized a continuous-wave terahertz spectrometer based on optical heterodyning of two near-infrared distributed-feedback diode lasers. Using active frequency stabilization we achieve 1 MHz resolution and a signal-to-noise ratio up to 80 dB.
A radially polarized beam was amplified up to 1.1 W by passing through an Yb-doped double clad fiber pumped by a semiconductor laser, maintaining both the polarization and intensity patterns of the input beam.
The polarization evolution of stimulated Brillouin scattering amplified signals in the presence of fiber birefringence is examined in analysis, simulation and experiment. The signal polarization is drawn towards the conjugate of the pump polarization.
We demonstrate the generation of 48 fs, 226 nJ pulses from an Yb-doped fiber amplifier with 18 W of average power. The system uses a simple stretcher-free, single-stage amplifier configuration. Gain fiber length and pump wavelength are chosen in order to achieve the optimum pulse width and pulse energy.
Spatially resolved spectral interferometry is used to measure the mode content of a Yb-doped photonic crystal-fiber amplifier having a 2300-mum2 mode area. The impact of misalignment at signal injection on the relative mode powers is quantified.
Higher-order-modes of a 70-mum core-diameter, Er-doped-fiber are characterized over a broad wavelength range using a supercontinuum with spatially and spectrally resolved imaging. Pumping the Er-doped-fiber with 1480-nm in the fundamental mode decreases the higher-order-mode content.
We demonstrate a carrier-envelope-offset-locked frequency comb with 500-pJ pulse energy, with increased coupling efficiency into a tellurite PCF by using angled-V-groove splicing. Carrier-envelope-offset stabilization at telecommunications wavelengths is achieved at the lowest pulse energy.
We demonstrate wavelength conversion based on cross-phase modulation induced nonlinear polarization rotation in a carbon nanotubes-filled micro-slot fiber device. Wavelength converted signal with 3-dB power penalty for 10 Gb/s NRZ signal is obtained.
Tunable narrow-linewidth operation of an Yb-doped fiber amplified-spontaneous-emission (ASE) source is reported. The source yielded 135 mW output at 1040 nm and could be tuned from 1034 nm to 1084 nm. The prospects for improvement in performance are considered.
The influence of fiber glass composition on dynamics of pump-induced refractive index changes in Yb-doped silicate fibers is reported. The Yb-ions polarizability difference responsible for the effect is determined for fibers with different Yb-ion lifetimes.
Four-wave mixing between a coherent laser signal and incoherent pump in highly nonlinear fiber are investigated theoretically and experimentally, and the effect of incoherence pump on signal is studied.
We report on a fiber CPA system producing 100 muJ energy pulses with quasi transform limited duration of 267 fs at a repetition rate of 300 kHz leading to a peak power of 345 MW.
We report on the first OP-GaAs OPO directly pumped by a 2.09 mum fiber laser. Up to 0.6 W average output power was achieved at 20 kHz repetition rate in the mid-infrared range.
A Q-switched laser system which couples two ytterbium doped fibers is presented. Depending on the pump intensity this system yields either short or long nanosecond pulses. The gain competition accounts for the observed phenomena.
We report on a 300-W-level picosecond laser based on a cryogenically-cooled Yb:YAG amplifier seeded by a fiber CPA system. High-average-power picosecond second harmonic generation is also presented.
We demonstrated non-degenerate sequential time-bin entanglement using periodically poled KTP waveguide at a repetition rate of 1 GHz. The wavelengths of signal and idler are 895 and 1310 nm. The two-photon-interference-fringe visibility is 79%.
We experimentally investigate the interactions between solitons in multi-bound states generated from an active mode-locked fiber laser and within the ring cavity. Their phase difference and corresponding interactions between solitons are studied.
A passively mode-locked Er-fiber laser via nonlinear polarization rotation with fundamental repetition rate of 300 MHz is demonstrated. Frequency stabilization of the spectrum-broadened, octave-spanning laser comb and application to optical frequency measurement is reported.
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