Ghasempour Askari, Leite A M P, Alexandre D, Reynaud F, Marques P V S, Garcia P J V, Moreira P J
Dep. de Física e Astronomia, Faculdade de Ciências, Universidade do Porto, Portugal.
Opt Express. 2010 Apr 26;18(9):9413-22. doi: 10.1364/OE.18.009413.
Integrated optics coaxial two, three and four telescope beam combiners have been fabricated by hybrid sol-gel technology for astronomical applications. Temporal and spectral analyses of the output interferometric signal have been performed, and their results are in mutual good agreement. The results of the characterization method employed are cross-checked using contrast measurements obtained independently, demonstrating that the chromatic differential dispersion is the main contributer to contrast reduction. The mean visibility of the fabricated devices is always higher than 95 %, obtained using a source with spectral bandwidth of 50 nm. These results show the capability of hybrid sol-gel technology for fast prototyping of complex chip designs used in astronomical applications.
集成光学同轴双、三、四望远镜光束组合器已通过混合溶胶-凝胶技术制造，用于天文应用。对输出干涉信号进行了时间和光谱分析，其结果相互吻合良好。使用独立获得的对比度测量结果对所采用的表征方法的结果进行了交叉检验，表明色差微分色散是对比度降低的主要因素。使用光谱带宽为50nm的光源，所制造器件的平均可见度始终高于95%。这些结果表明了混合溶胶-凝胶技术在快速原型制作用于天文应用的复杂芯片设计方面的能力。
