Highly efficient relief diffraction gratings inscribed on a chalcogenide bulk glass by a femtosecond laser
Kohoutek, T, Kawashima, H, Suzuki, T, Ohishi, Y, Hughes, MA, Mastumoto, M and Misumi, T (2012) Highly efficient relief diffraction gratings inscribed on a chalcogenide bulk glass by a femtosecond laser Proceedings of SPIE - The International Society for Optical Engineering, 8428.
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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 Ga Sb S 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. © 2012 SPIE.
|Divisions :||Faculty of Engineering and Physical Sciences > Electronic Engineering > Advanced Technology Institute > Nano-Electronics Centre|
|Identification Number :||10.1117/12.921381|
|Additional Information :||Copyright 2012 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.|
|Depositing User :||Symplectic Elements|
|Date Deposited :||07 Feb 2013 10:18|
|Last Modified :||23 Sep 2013 19:48|
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