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- W2017102669 abstract "Direct laser writing has been already demonstrated for the fabrication of under surface buried 3D mid-IR waveguides in chalcogenide glasses by employing a large photo-induced refractive index change in the features formed in the path of the focused beam from a short pulse laser. In this paper, we report on direct laser writing of relief diffraction gratings with periods of 6, 14 and 24 μm into the surface of Ge<sub>15</sub>Ga<sub>3</sub>Sb<sub>12</sub>S<sub>70</sub> chalcogenide glass by using a 800 nm Ti:saphire femtosecond pulse laser. The first order diffraction efficiency of the fabricated gratings was over 60 % at 650 nm. We have also fabricated a composite grating composed of three relief diffraction gratings inscribed in the same position, but with a mutual tilt. Composite grating provided complex multidirectional diffraction of the light in the accordance with geometrical arrangement and grating period of all the gratings inscribed. The fabrication was implemented on a computer controlled stage employing surface-to-beam alignment, laser power and raster pattern control. Pulse energies of 1.5, 3.0 and 4.5 μJ were used, resulting in channel widths of around 4, 5 and 6 μm, respectively, and depths up to 1.7 μm. We propose practical applications including surface relief diffraction micro-gratings at the ends of multimode chalcogenide optical waveguides or on the surfaces of bare core optical fibers used for chemical sensing." @default.
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- W2017102669 date "2012-06-01" @default.
- W2017102669 modified "2023-10-11" @default.
- W2017102669 title "Highly efficient relief diffraction gratings inscribed in a chalcogenide bulk glass by a femtosecond laser" @default.
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- W2017102669 doi "https://doi.org/10.1117/12.921381" @default.
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