用于极端自适应光学系统的衍射限制积分场spectroscopy，采用多芯光纤馈电积分场单元
Diffraction-limited integral-field spectroscopy for extreme adaptive optics systems with the Multi-Core fiber-fed Integral-Field Unit
摘要：
直接成像仪器具有空间分辨率，可以将系外行星从其宿主恒星中分辨出来。这使得能够直接表征系外行星的大气，但大多数直接成像仪器没有足够高分辨率的光谱仪来详细描述大气特征。我们调查使用的单模衍射有限积分场单元，是紧凑的，易于集成到当前和未来的直接成像仪器的系外行星表征。这是通过利用光子制造的最新进展来实现的，以创建单模光纤馈送图像重定格式器。光纤链路是在单模多芯光纤的顶部用3D打印透镜创建的，该光纤馈送超快激光雕刻的光子芯片，该光子芯片将光纤重新格式化为伪狭缝。然后，我们将其耦合到一个一阶摄谱仪与三重堆叠体相位全息光栅在大带宽的高效率。该原型系统已经在4.2米的威廉赫歇尔望远镜上成功地进行了第一次光观测。根据波长的不同，测得的天空分辨能力在2500到3000之间。通过我们的观察，我们表明，单模积分场光谱是当前和未来系外行星成像仪器的一个可行的选择。
英文摘要：
Direct imaging instruments have the spatial resolution to resolve exoplanets from their host star. This enables direct characterization of the exoplanets atmosphere, but most direct imaging instruments do not have spectrographs with high enough resolving power for detailed atmospheric characterization. We investigate the use of a single-mode diffraction-limited integral-field unit that is compact and easy to integrate into current and future direct imaging instruments for exoplanet characterization. This achieved by making use of recent progress in photonic manufacturing to create a single-mode fiber-fed image reformatter. The fiber-link is created with 3D printed lenses on top of a single-mode multi-core fiber that feeds an ultrafast laser inscribed photonic chip that reformats the fiber into a pseudo-slit. We then couple it to a first-order spectrograph with a triple stacked volume phase holographic grating for a high efficiency over a large bandwidth. The prototype system has had a successful first-light observing run at the 4.2 meter William Herschel Telescope. The measured on-sky resolving power is between 2500 and 3000, depending on the wavelength. With our observations we show that single-mode integral-field spectroscopy is a viable option for current and future exoplanet imaging instruments.
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