Ge-Doped microstructured multicorefiber for customizable supercontinuum generation

Supercontinuum generation in a multicore fiber in which several uncoupled cores were doped with dissimilar concentrations of germanium was studied experimentally. Germanium doping provided control over the separation between the zero-dispersion wavelength and the 1064-nm wavelength of a Q-switched Nd:YAG pump laser. Supercontinua generated independently in each core of the same piece of fiber displayed clear and repeatable differences due to the influence of germanium doping on refractive index and four-wave mixing. The spectral evolution of the subnanosecond pump pulses injected into the different cores was accurately reproduced by numerical simulations

Chromatic confocal setup for displacement measurement using a supercontinuum light source

Chromatic confocal microscopy is a technique to measure distances by analyzing the spectrum of the light reflected by a sample. The key element of the confocal setup is a dispersive lens, which focuses different wavelengths at different distances from the lens. In this paper,a novel setup realized with a supercontinuum light source and a spatial filter composed by reflective elements is described.The supercontinuum source is implemented by injecting high power pulses from a microchip laser into a Ge-doped microstructured optical fiber. The usage of metallic parabolic mirrors, for the focusing and collimation required in the spatial filter, lets the dispersive lens be the only dispersive element of the confocal setup and improves the efficiency of the spatial filter itself. A silicon-based spectrometer is used for the acquisition of the spectra, which are normalized and Gaussian-fitted before extracting the displacement information. A complete calibration is performed, and the set of wavelengths from 500 nm to 900 nm can be mapped into a280 um measuring range. The obtained relativ eaccuracy of 0.36% shows an enhancement of almost one order of magnitude when compared to other supercontinuum-based confocal systems

Efficiency of dispersive wave generation in dual concentric core microstructured fiber

We describe the generation of powerful dispersive waves that are observed when pumping a dual concentric core microstructured fiber by means of a sub-nanosecond laser emitting at the wavelength of~1064 nm. The presence of three zeros in the dispersion curve, their spectral separation from the pump wavelength, and the complex dynamics of solitons originated by the pump pulse break-up, all contribute to boost the amplitude of the dispersive wave on the long-wavelength side of the pump. The measured conversion efficiency towards the dispersive wave at 1548 nm is as high as 50%. Our experimental analysis of the output spectra is completed by the acquisition of the time delays of the different spectral components. Numerical simulations and an analytical perturbative analysis identify the central wavelength of the red-shifted pump solitons and the dispersion profile of the fiber as the key parameters for determining the efficiency of the dispersive wave generation process.Comment: 11 pages, 12 figure

Broadband optical supercontinuum generation in a long cavity fibre laser

We describe optical supercontinuum generation in an actively modelocked fibre ring laser using a pulsed mode-locking technique. Recirculation of a section of the continuum facilitated spectral broadening.3 page(s

Giant dispersive wave generation in double core photonic crystal fiber

A soliton perturbed by higher-order dispersion terms can transfer power to a dispersive wave when they share a common phase velocity. This dispersive wave can be located several hundreds of nanometers away from the soliton carrier wavelength. We numerically study this phenomenon in a double-core photonic crystal fiber pumped at 1064 nm: the presence of a large quantity of short pulses due to the pump pulse break-up and the dispersion profile lead to the growth of a dispersive wave at 1535 nm whose amplitude is comparable to the pump. Preliminary experiments confirm our predictions

Observation of Giant Dispersive Wave Emission from a Double-Core Microstructured Fiber

International audienceAbstract (40-Word Limit): We achieved highly efficient frequency down-conversion to 1535 nm of 600 ps pump pulses at 1064 nm at the output of a double-core microstructured fiber, based on the mechanism of resonant energy transfer from optical solitons into a dispersive wave

Modal four-wave mixing supported generation of supercontinuum light from the infrared to the visible region in a birefringent multi-core microstructured optical fiber

International audienceWe experimentally studied the process of supercontinuum generation in a birefringent multi-core microstructured optical fiber. By selecting the excitation of the fundamental mode, or by combining the first and the second order modes of a particular core, it was possible to emphasize the role of four-wave mixing on the transfer of power from the infrared to the visible region of the spectrum. We carried out an in-depth analysis of the effects of input light polarization on the generated supercontinuum spectral features. The measured polarization properties of the output Stokes and anti-Stokes bands confirmed the strong vector nature of the four-wave mixing processes. The experimental spectra exhibit excellent agreement with numerical simulations of the nonlinear mode interactions

Modal four-wave mixing supported generation of supercontinuum light from the infrared to the visible region in a birefringent multi-core microstructured optical fiber

We experimentally studied the process of supercontinuum generation in a birefringent multi-core microstructured optical fiber. By selecting the excitation of the fundamental mode, or by combining the first and the second order modes of a particular core, it was possible to emphasize the role of four-wave mixing on the transfer of power from the infrared to the visible region of the spectrum. We carried out an in-depth analysis of the effects of input light polarization on the generated supercontinuum spectral features. The measured polarization properties of the output Stokes and anti-Stokes bands confirmed the strong vector nature of the four-wave mixing processes. The experimental spectra exhibit excellent agreement with numerical simulations of the nonlinear mode interactions

Generation of supercontinuum light from the infrared to the visible region in a birefringent microstructured optical fiber

We experimentally studied supercontinuum generation in a birefringent multi-core photonic crystal fiber by investigating the effects of input light polarization and power on the quality of the output spectrum. The pump wave at 1064 nm was situated far in the anomalous dispersion regime, and generates anti-Stokes and Stokes signals which are broadened towards the IR by Raman scattering and towards the visible by XPM.6 page(s