Single-mode waveguides for GRAVITY
Single-mode waveguides for GRAVITY
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用于重力的单模波导
DOI：
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发表时间：
2018
影响因子：
6.5
通讯作者：
C. Straubmeier
中科院分区：
文献类型：
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作者：
K. Perraut;L. Jocou;J. P. Berger;A. Chabli;V. Cardin;G. Chamiot;A. Delboulbé;F. Eisenhauer;Y. Gambérini;S. Gillessen;S. Guieu;J. Guerrero;M. Haug;F. Haussmann;F. Joulain;P. Kervella;P. Labeye;S. Lacour;C. Lanthermann;V. Lapras;J. L. Bouquin;M. Lippa;Y. Magnard;T. Moulin;P. Noël;A. Nolot;F. Patru;Guy Perrin;O. Pfuhl;S. Pocas;S. Poulain;C. Scibetta;E. Stadler;R. Templier;N. Ventura;C. Vizioz;A. Amorim;Wolfgang Brandner;C. Straubmeier
上下文在欧洲南方天文台甚大望远镜干涉仪的第二代仪器的框架内，我们开发了集成光学中的四望远镜光束组合器。
目标。我们首次在近红外K波段优化了这种光束组合器的性能，用于专门通过精密窄角天体测量和干涉成像研究银河系中心黑洞封闭环境的重力仪器。
方法.我们优化了集成光学芯片的设计和制造技术，以满足非常苛刻的吞吐量规格。我们还设计了一个集成的光学组件，能够在200 K的重力低温恒温器，以减少热辐射。
结果我们用硅基硅刻蚀技术制作了约50个合束器。我们将最好的合束器粘在单模氟化物光纤阵列上，将VLTI光注入集成光学光束合束器。最终的集成光学组件已在实验室和现场校准中得到充分表征：其K波段的全局吞吐量高于55%，偏振光下的仪器对比度达到95%以上，完全符合GRAVITY规格。
结论.虽然集成光学技术已经足够成熟，可以为H波段的天文干涉测量提供高效可靠的光束组合器，但我们成功地将其扩展到K波段的最长波长，并在这个特定的光谱波段制造了最复杂的集成光学光束组合器。
Context. Within the framework of the second-generation instrumentation of the Very Large Telescope Interferometer of the European Southern Observatory we have developed the four-telescope beam combiner in integrated optics.
Aims. We optimized the performance of such beam combiners, for the first time in the near-infrared K band, for the GRAVITY instrument dedicated to the study of the close environment of the galactic centre black hole by precision narrow-angle astrometry and interferometric imaging.
Methods. We optimized the design of the integrated optics chip and the manufacturing technology as well, to fulfil the very demanding throughput specification. We also designed an integrated optics assembly able to operate at 200 K in the GRAVITY cryostat to reduce thermal emission.
Results. We manufactured about 50 beam combiners by silica-on-silicon etching technology. We glued the best combiners to single-mode fluoride fibre arrays that inject the VLTI light into the integrated optics beam combiners. The final integrated optics assemblies have been fully characterized in the laboratory and through on-site calibrations: their global throughput over the K band is higher than 55% and the instrumental contrast reaches more than 95% in polarized light, which is well within the GRAVITY specifications.
Conclusions. While integrated optics technology is known to be mature enough to provide efficient and reliable beam combiners for astronomical interferometry in the H band, we managed to successfully extend it to the longest wavelengths of the K band and to manufacture the most complex integrated optics beam combiner in this specific spectral band.
影响因子：
6.5
作者：
G. C. R. Abuter;M. Accardo;A. Amorim;N. Anugu;G. Ávila;N. Azouaoui;M. Benisty;J. Berger;N. Bl
通讯作者：
G. C. R. Abuter;M. Accardo;A. Amorim;N. Anugu;G. Ávila;N. Azouaoui;M. Benisty;J. Berger;N. Bl