The adaptive optics system for the second-generation Very Large Telescope-interferometer(VLTI)instrument GRAVITY consists of a novel cryogenic near-infrared wavefront sensor to be installed at each of the four unit te...The adaptive optics system for the second-generation Very Large Telescope-interferometer(VLTI)instrument GRAVITY consists of a novel cryogenic near-infrared wavefront sensor to be installed at each of the four unit telescopes of the Very Large Telescope(VLT).Feeding the GRAVITY wavefront sensor with light in the 1.4–2.4μm band,while suppressing laser light originating from the GRAVITY metrology system requires custom-built optical componets.In this paper,we present the development of a quantitative near-infraredpoint diffraction interferometric characterization technique,which allows measuring the transmitted wavefront error of the silicon entrance windows of the wavefront sensor cryostat.The technique can be readily applied to quantitative phase measurements in the near-infrared regime.Moreover,by employing a slightly off-axis optical setup,the proposed method can optimize the required spatial resolution and enable real time measurement capabilities.The feasibility of the proposed setup is demonstrated,followed by a theoretical analysis and experimental results.Our experimental results show that the phase error repeatability in the nanometer regime can be achieved.展开更多
相互作用双原行星盘系统的近红外偏振观测基于欧洲南方天文台甚大望远镜(Very Large Telescope,VLT的)观测数据,一组国际科研团队获得了三个已知正在进行相互作用的恒星“双盘系统”(twin-disksystem)的近红外偏振光图像,增强了天文学...相互作用双原行星盘系统的近红外偏振观测基于欧洲南方天文台甚大望远镜(Very Large Telescope,VLT的)观测数据,一组国际科研团队获得了三个已知正在进行相互作用的恒星“双盘系统”(twin-disksystem)的近红外偏振光图像,增强了天文学家对于距离相近的恒星如何对行星形成影响的理解。展开更多
如果我在月面上点起一直蜡烛（假设可以点着，其实是点不了的，因为月球上没有空气），夜幕下地面上的你能否看到它？答案是肯定的，因为今年人类建成了迄今为止口径最大的光学天文望远镜，它就是南非大望远镜South African Large Teles...如果我在月面上点起一直蜡烛（假设可以点着，其实是点不了的，因为月球上没有空气），夜幕下地面上的你能否看到它？答案是肯定的，因为今年人类建成了迄今为止口径最大的光学天文望远镜，它就是南非大望远镜South African Large Telescope．简称SALT，它的口径达到11米，要比我们从前介绍过的2000年建成的甚大望远镜（VLT）口径还要大2．8米！展开更多
文摘The adaptive optics system for the second-generation Very Large Telescope-interferometer(VLTI)instrument GRAVITY consists of a novel cryogenic near-infrared wavefront sensor to be installed at each of the four unit telescopes of the Very Large Telescope(VLT).Feeding the GRAVITY wavefront sensor with light in the 1.4–2.4μm band,while suppressing laser light originating from the GRAVITY metrology system requires custom-built optical componets.In this paper,we present the development of a quantitative near-infraredpoint diffraction interferometric characterization technique,which allows measuring the transmitted wavefront error of the silicon entrance windows of the wavefront sensor cryostat.The technique can be readily applied to quantitative phase measurements in the near-infrared regime.Moreover,by employing a slightly off-axis optical setup,the proposed method can optimize the required spatial resolution and enable real time measurement capabilities.The feasibility of the proposed setup is demonstrated,followed by a theoretical analysis and experimental results.Our experimental results show that the phase error repeatability in the nanometer regime can be achieved.
文摘相互作用双原行星盘系统的近红外偏振观测基于欧洲南方天文台甚大望远镜(Very Large Telescope,VLT的)观测数据,一组国际科研团队获得了三个已知正在进行相互作用的恒星“双盘系统”(twin-disksystem)的近红外偏振光图像,增强了天文学家对于距离相近的恒星如何对行星形成影响的理解。
文摘如果我在月面上点起一直蜡烛（假设可以点着，其实是点不了的，因为月球上没有空气），夜幕下地面上的你能否看到它？答案是肯定的，因为今年人类建成了迄今为止口径最大的光学天文望远镜，它就是南非大望远镜South African Large Telescope．简称SALT，它的口径达到11米，要比我们从前介绍过的2000年建成的甚大望远镜（VLT）口径还要大2．8米！
