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In this study, dual pulsed laser ablation was used to prepare composite nanoparticles. Formation of composite nanoparticles was attempted by controlling the amount of time delay between the laser ablation processes, which was accomplished by imposing time delay on the pulse arrival at two different target materials. By monitoring the emission spectra of the laser plume, the relation between the time...
Quantum dot laser diodes are expected to replace conventional semiconductor laser diodes in new high-speed information and communication devices. We successfully fabricated disk-shaped quantum dots using a bio-template and neutral beam etching. Our original top-down process achieved defect-less and a high density of dots from etching process compared with conventional plasma processes. Therefore,...
This paper presents the analysis of an orthogonal multi-beam Lloyd's mirror interferometer for fabrication of two-axis gratings, which is employed as a measurement standard. Conventionally, for the fabrication of such complicated micro patterns, ultra-precision turning with a fast tool servo or lithography process with masks has been employed. However, they require long machining or fabrication time...
This paper presents nanometrology of an ultraprecision machined surface by using optical sensors. To verify the feasibilities of optical sensors on the measurement of surface profile, different types of fiber-optic sensor and laser micro interferometer are employed to measure the roundness of a ultraprecision machined cone in this paper. Experiments confirmed that the fiber-optic sensor can measure...
This paper demonstrates the advantages of a femtosecond-laser-processing method as a novel fabrication technique of waveguides containing such nanocomposites inside glass materials. By focusing the femtosecond laser inside the transparent glass, the nanocomposites are space-selectively precipitated as results of atomic diffusion and crystallization processes. At the same time, the refractive index...
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