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We present in situ nano-crystallization dynamics using X-ray microdiffraction, reporting such experiments for the first time to our knowledge. Specifically, we investigate the case of a femtosecond laser-induced nano-crystallization process in an amorphous multilayer stack of Al2O3/Nb2O5 layers using operando X-ray micro-diffraction at the microXAS beamline of the Swiss Light Source (SLS). We identify the crystalline phases and the timescales of the transition using varying laser exposure conditions.
Towards new type of optofluidic dye lasers fabricated by femtosecond laser (Conference Presentation)
Here, we demontrate an expansion of this process with an additional fabrication step that enables the integration of three-dimensional embedded metallic structures out of useful engineering metals such as silver, gold, copper as well as some of their alloys. This additional step is an adaptation of the pressure infiltration for the insertion of high conductivity, high melting point metals and alloys into topologically complex, femtosecond laser-machined cavities in fused silica. This produces truly 3-dimensional microstructures, including microcoils and needles, within the bulk of glass substrates. Combining this added capability with the existing possibilities of femtosecond laser micromachining (i.e. direct written waveguides, microchannels, resonators, etc.) opens up a host of potential applications for the contactless fabrication of highly integrated monolithic devices that include conductive element of all kind.
We present preliminary results from this new fabrication process, including prototype devices that incorporate 3D electrodes with aspect ratios of 1:100 and a feature size resolution down to 2μm. We demonstrate the generation of high electric field gradients (of the order of 1013 Vm-2) in these devices due to the 3-dimensional topology of fabricated microstructures.
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