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This paper will present fiber laser cutting results in stainless steel using a PSO enabled motion system. The objective for this work is to minimize the HAZ and heat distortion during laser micro machining.
We propose a tunable spectral bandpass filter using short- and long-wavelength bend-loss edges of both MSF and HOF. Various spectral functionalities of filter are obtained by carefully choosing optimal bend radii for serially concatenated fibers.
A new type of hydrogen sensor with a side-polished fiber Bragg grating coated with thin palladium film was demonstrated with the Bragg wavelength shift of 0.12 nm in the case of 99% hydrogen concentrations.
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.
We have demonstrated a beam scanning multi-photon multi-harmonic endoscope based on a flexible fiber bundle. Excited by a femtosecond Cr:Forsterite laser, multi-photon multi-harmonic excitation efficiencies are recovered without any external devices.
We present characterization of a fiber laser based on newly developed erbium and ytterbium doped double-clad fiber with cross section tailored for direct splicing with the pump and signal fibers.
A nonlinear index guiding silica PCF is optimized for efficient second harmonic generation through dispersion calculations zero group velocity mismatch is possible for any pump wavelength above 80 nm. Very high conversion efficiencies and bandwidths are found.
A common-path-interference dispersion-measurement scheme for fiber Bragg gratings is experimentally demonstrated. The group delay is obtained by processing the interference spectrum and the results excellently match the data from an optical network analyzer.
We demonstrate propagation and compression of 14-nJ, 152-fs pulses in the 2100-mum2 effective area, LP07 mode of an intentionally multi-moded fiber. The 12-m length of fiber was coiled to a radius of curvature of 7.5 cm.
We show that, in a typical terrestrial WDM system, the intra-channel nonlinearity-induced Q fluctuation is comparable to that due to PDL alone, and the inter-channel nonlinearity dominates Q fluctuations at narrow channel spacings.
We demonstrate that two- and three-dimensional geometric constructs of flexible and lightweight photosensitive fibers may be designed to obtain the amplitude and phase of an optical field on unprecedented length scales.
We demonstrate an all-optical polarization controller using the injection-locking induced transverse-mode switching of 1.5 mum elliptical-apertured VCSEL. The polarization of an output fundamental-mode was stabilized even for randomly polarized input light injected into a high-order transverse mode.
A light source using sum-frequency generation is developed for the ytterbium clock transition at 578 nm. Doppler-free spectroscopy of iodine lines near the Yb clock transition and frequency stabilization are demonstrated with the light source.
Soft-glass photonic-crystal fiber is used to generate broad supercontinuum using an all-fiber-femtosecond laser. The bandwidth exceeds 1700 nm and has average powers in excess of 100 mW with 46-MHz repetition rate.
We investigate wavelength conversion by cross-phase modulation in the presence of strong dispersion and two photon absorption in highly nonlinear singlemode As2Se3 fiber, achieving conversion over a span of 30 nm.
We demonstrate the formation of long period gratings in fluid-filled photonic bandgap fiber (PBGF). The unique modal properties of PBGFs allow for coupling to LP11-like modes at multiple wavelengths. We obtain good agreement with simulations.
We use light-induced atomic desorption to produce an appreciable density of Rubidium atoms in a hollow-core photonic bandgap fiber and demonstrate electromagnetically induced transparency at very low light levels.
A method for splicing hollow-core photonic bandgap fiber to step-index fiber using a commercial arc fusion splicer has been developed. These splices compare favorably with commercially available splices for nonlinear optical interactions with gases.
We demonstrate engineered refractive index profiles for the mitigation of nonlinear optical impairments such as stimulated Raman scattering and stimulated Brillouin scattering. These fibers offer performance improvements over conventionally used large mode area fibers.
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