标题： 天文干涉集成光学 VI. 在K波段耦合VLTI的光 显示英文标题

标题： Integrated optics for astronomical interferometry - VI. Coupling the light of the VLTI in K band

摘要： 我们的目标是证明集成光学（IO）不仅是一种适用于天文干涉测量的好概念，也是一种具有高性能的工作技术。 我们使用了专门为K波段集成光学双望远镜光束合成器获得的调试数据，该设备现在替代了VLTI/VINCI仪器中的光纤耦合器MONA。 我们描述了这个IO设备的行为，并将其特性与其他单模光束合成器（如之前使用的MONA光纤耦合器）进行了比较。 IO合成器提供了高光学通量，在夜晚之间的对比度为89%，稳定性为几个百分点。 即使存在色散相位，我们也证明它不会影响测量的傅里叶可见度估计。 测量得到线性偏振态之间的串扰上限为0.005。 我们利用其固有的对比度稳定性测试了一种新的天文程序，用于同时拟合仪器对比度和恒星视直径，从而校准简单恒星的直径。 这种方法达到了与以前相同精度的直径误差，但不需要已知的校准器。 这些结果是集成光学的重要一步，并为未来的成像干涉仪项目铺平了道路。 显示英文摘要

摘要： Our objective is to prove that integrated optics (IO) is not only a good concept for astronomical interferometry but also a working technique with high performance. We used the commissioning data obtained with the dedicated K-band integrated optics two-telescope beam combiner which now replaces the fiber coupler MONA in the VLTI/VINCI instrument. We characterize the behaviour of this IO device and compare its properties to other single mode beam combiner like the previously used MONA fiber coupler. The IO combiner provides a high optical throughput, a contrast of 89% with a night-to-night stability of a few percent. Even if a dispersive phase is present, we show that it does not bias the measured Fourier visibility estimate. An upper limit of 0.005 for the cross-talk between linear polarization states has been measured. We take advantage of the intrinsic contrast stability to test a new astronomical prodecure for calibrating diameters of simple stars by simultaneously fitting the instrumental contrast and the apparent stellar diameters. This method reaches an accuracy with diameter errors of the order of previous ones but without the need of an already known calibrator. These results are an important step of integrated optics and paves the road to incoming imaging interferometer projects.