Use of steel substrates in diffractive optics: Near field of high surface quality steel tape gratings
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- 作者：Francisco Javier Salgado-Remacha<sup> ; sup><sup>asup><sup> ; sup><sup>fjsalgado@fis.ucm.essup> ; Francisco Jose Torcal-Milla<sup>asup> ; Luis Miguel Sanchez-Brea<sup>asup> ; Eusebio Bernabeu<sup>asup>
- 关键词：Diffraction gratings ; Talbot effect ; Rough surfaces ; Steel tape
- 刊名：Optics and Lasers in Engineering
- 出版年：2011
- 出版时间：March 2011
- 年：2011
- 卷：49
- 期：3
- 页码：356-360
- 全文大小：771 K
文摘
Steel tape is used in optical applications due to its mechanical properties. However, roughness of steel surfaces affects to wave propagation. The effect can be observed using diffraction gratings with low periods. In such a case, self-images of the grating appear at certain periodic distances from the grating (Talbot planes). When standard steel is used, the contrast of Talbot self-images strongly decreases with the distance from the grating. In this work, we prove that controlling the surface quality of steel, it is possible to improve its optical behavior and, as a consequence, high quality surface steel represents a good choice for diffractive optics when the use of chrome-on-glass masks is not indicated. As an example, we have manufactured a diffraction grating over a high quality steel surface by means of an ablation process with a nanosecond pulsed laser. The contrast of the self-images for these gratings decreases very slowly with the distance, in comparison with the self-images obtained with standard steel tape gratings.