Search results for: J.-M. Blondy
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The dramatic progress in power-scaling of ultra-short pulse (USP) lasers and their continuous expansion use in industrial applications call for flexible and robust beam delivery systems (BDS) over several meters. Recently, a new branch of hollow-core photonic crystal fiber (HC-PCF) based on inhibited coupling (IC) mechanism has been proposed and successfully applied to demonstrate the delivery of...
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We developed an inhibited-coupling Kagome HC-PCF with its fundamental transmission-band shifted down to 670 nm while maintaining its hypocycloidal core-contour resulting in a very broad single-band with a loss of 30 dB/km.
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We report on enlarged hollow-core diameter inhibited coupling Kagome fibers with record loss of 100 dB/km and ppm power overlap with silica surround, suitable for high energy ultrafast laser handling.
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Materials Letters > 2014 > 120 > Complete > 292-294
SiO 2 /SnO 2 nanostructured optical fibers are elaborated using two ways based on the chemical sol-gel method: the “inverse-dip coating” and the “powder in tube” processes. The structural and waveguiding properties of the drawn optical fibers are studied according to the concentration of SnO 2 nanocrystals. In this way, the study on the 450–1750nm wavelength range shows that...
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We report on the development of hypocycloidal-core kagome HC-PCF operating efficiently in the 450nm–650nm visible spectral range. Transmission loss as low as 70dB/km is achieved. Strong Raman comb generation and laser beam delivery are demonstrated.
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Recent years, researches have shown that it is possible to achieve nanostructured core fibres by incorporating dielectric [1,2], metallic nanoparticles such as Au, or quantum dots [3] in an amorphous matrix. These nanoparticles dispersed in a silica matrix present the advantage to accept a high concentration of doping ions such as rare-earth (RE) ions avoiding the quenching phenomenon, which allows...
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In this work we propose a new design of photonic crystal fiber with a side channel in the cladding region. The advantage of this fiber design is to provide easy access to the fiber core for applications requiring real-time measurement and longer interactions with light, such as microfluidic devices and solution-based optical sensors.
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In this communication we report the study of novel optical fibers doped by semiconductor quantum dots (QDs). Different approaches have been investigated to realize liquid-core fibers filled with PbSe QDs and hollow-core fibers with deposition of layers of these nanoparticles. The optical characterization demonstrates good levels of QD emission which can be tunable over a wide range of IR wavelengths...
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We demonstrate for the first time ns-laser spark ignition through kagome-type fibers in a friendly manner. The energy threshold damage is pushed over the 10mJ-level and the output power density is approaching TW/cm2 after focusing.
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PbS QDs embedded in silicate glass have been prepared and studied for their absorption and emission characteristics. The control and the understanding of heat-treatment conditions have enabled successful fabrication of QDs doped optical fibers.
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We report on new class of microwave resonator enabling generation of a stable microplasma in 100 μm core-diameter kagome-latticed HCPCF without any structural damage. Blue Ar+ lines are successfully generated with low microwave power.
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We experimentally observed for the first time the built up of a microwave microplasma in gas-filled hollow-core waveguides with internal diameter down to 65μm. Ultraviolet wavelengths have been generated and guided directly inside the hollow-core.
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Kagome fibers were fabricated with core size larger than 100 μm. The fibers combined low loss over broad transmission and with small bend loss, making it a potential solution for high power and fast laser delivery.
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We report on the fabrication of a large pitch hollow-core fiber designed for maximizing energy transmission at 1064nm. Due to an air-mode/silica overlap reduced to 0.05%, a first demonstration of 4mJ nanosecond-pulses coupling is achieved.
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We report on the first ignition of efficient and stable microwave columns of microplasmas directly inside large Ar-filled hollow-core photonic crystal fibers. Optical characterizations of UV guided light are also presented.
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Kagome-lattice fibers with different number of cladding layers have been investigated. Adding at least two layers decreases the bending sensitivity by more than one order of magnitude, resulting on tiny effects in the fundamental band.
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Hollow-core thin silica tubes based on antiresonant guiding mechanism are studied with Terahertz (THz) time domain spectroscopy (TDS) setup. By controlling the parameters of the waveguide, broad transmission windows, up to 580 GHz, is demonstrated at terahertz frequencies.
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We demonstrate the propagation of terahertz (THz) radiations through a hollow-core waveguide based on a two dimensional photonic band gap crystal cladding. The measurements are done with THz Time Domain Spectroscopy (TDS).
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We report on the demonstration of a resonator based on electromagnetic field confinement in a hollow-core by an out-of-plane 2D photonic band-gap (PBG) crystal cladding. The resonator is designed to concentrate the energy within an air region in the center of the resonator and away from the cavity walls to minimize conductor losses. In contrast with in- plane 2D PBG crystal devices, the PBG crystal...
