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We demonstrated a novel fabrication technique of highly monodispersed noble metal nanoparticles by femtosecond pulsed laser irradiation of aqueous solution.
The fabrication of periodic poled Lithium Tantalate single crystal fibers by the laser heated pedestal growth method were achieved with in-situ monitoring of transient poling current. The whole cross section of the fiber is poled through as seen from the confocal measurement.
Sub-wavelength structuration by femtosecond laser interaction in a model glass doped with silver ions is investigated. Induced silver clusters are used to probe free carriers distribution. Theoretical mechanism is discussed and compared to fluorescence imaging.
Waveguides were fabricated inside a Bi-doped silica glass using ultrafast laser inscription. When optically pumped at 980 nm, ultra-broadband gain was measured from the waveguides, paving the way for compact ultra-broadband optical amplifiers.
We have performed temperature-dependent resistivity measurements of silicon after doping with sulfur via femtosecond laser irradiation. Results are consistent with a theoretically predicted binding energy for sulfur donors of 100 meV below the conduction-band edge.
We have demonstrated nondestructive 3D imaging of the femtosecond laser written 3D structures of both index change and optical breakdown within fused silica by using the optical coherence microscopy providing high lateral and depth resolution.
A three dimensional fan-out device has been fabricated using ultrafast laser inscription. The device allows each core of a multicore fibre to be addressed individually by a single mode fiber held in an FVA.
Nanogratings spaced at 630 nm on NiTi alloy surfaces are produced by self-organized nanoplasma planes following scan of linearly-polarized femtosecond laser pulses. Their formation characteristics are investigated. Theoretical analysis matches well with our observations.
A dual purpose femtosecond laser processing and 5D spectroscopic (xyz, time, wavelength) microscopy system provides intelligent in-situ analysis and on-the-fly control of optical waveguides during laser writing. Definitive evidence of heat accumulation effects is reported.
We have demonstrated femtosecond laser direct written volume diffractive optical elements in a fused silica. The fabrication of a built-in coupler consisting of a direct written waveguide and a Fresnel lens has been described.
The emission intensity of a fluorescent dye is increased by 104 times through the combined effects of enhanced near-fields produced by a 1-dimensional photonic crystal and enhanced surface area provided by a nanorod coating.
A 1.2(height)times125(depth)times500(length) micro-slot was engraved along a fiber Bragg grating by chemically assisted femtosecond laser processing. By filling epoxy and UV-curing, waveguide with plastic-core and silica-cladding was created, presenting high thermal responding coefficient of 211pm/degC.
A single laser exposure method of fabricating three-dimensional polymer photonic crystal having large number of layers has been demonstrated using a novel multi-layer diffractive optical element. Strong photonic stopbands are reported in the telecom band.
We realize a variety of silicon photonic crystal structures. Direct laser writing of polymeric templates (square/circular spirals and slanted pore structures) combined with a silicon single-inversion procedure leads to band gaps in the near infrared.
Random lasing is a unique tool to investigate the longest-lived light modes in a disordered material. The behavior of very strongly scattering random lasers in our experiments is well understood in terms of these modes.
We present the concept of a refractive index sensor based on integration of a three dimensional photonic crystal with a microchannel by femtosecond laser fabrication. The sensor performance was characterized by FTIR spectroscopy.
Asymmetric directional couplers were written inside bulk borosilicate glass by a high repetition rate femtosecond laser. Wavelength-dependent coupling ratios were tuned by laser exposure and coupler geometry, yielding flattened spectral response (plusmn5%) over >400-nm bandwidth.
Micro- and nanofabrication of cavities in the volume of sapphire was performed by femtosecond laser irradiation followed by chemical etching with aqueous solution of HF acid. Depending on the focusing conditions self-organized nanostructures or elliptical microchannels are produced. This manufacturing technique is potentially usable for photonic crystals in integrated optical elements or microfluidic...
We demonstrate simultaneous drilling and coaxial depth imaging of holes in stainless steel at axial rates of 46 kHz. Depth measurement with 6 mum resolution is performed using the machining beam via Fourier-domain interferometry.
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