BIGRE：一种适用于太阳系外行星成像的低串扰积分场单元spectroscopy
BIGRE: a low cross-talk integral field unit tailored for extrasolar planets imaging spectroscopy
摘要：
积分场光谱学（IFS）是一种通过高对比度成像探测和表征太阳系外行星的强大技术，因为它可以同时获得大量的单色图像。这些可以用来校准，然后减少散斑的影响，一旦他们的色彩依赖性被考虑在内。在设计用于高对比度成像的积分场摄谱仪时，主要关注的是衍射效应和非共路像差的影响以及检测器像素的有效使用。我们把我们的注意力集中在基于小透镜阵列的积分场光谱仪上，讨论了这些设计的主要特点：当系统工作在衍射极限时，所得到的光谱仪的狭缝函数及其相关的串扰项的适当的空间和光谱采样的条件。我们提出了一个新的计划的积分场单元（IFU）的基础上的双小透镜设备（BIGRE），解决了一些问题，经典的TIGER设计时，用于这样的应用。我们表明，BIGRE提供了比TIGER低得多的串扰信号，允许更有效地使用检测器像素和相当大的节省的整体成本的基于小透镜的积分场光谱仪。
英文摘要：
Integral field spectroscopy (IFS) represents a powerful technique for the detection and characterization of extrasolar planets through high contrast imaging, since it allows to obtain simultaneously a large number of monochromatic images. These can be used to calibrate and then to reduce the impact of speckles, once their chromatic dependence is taken into account. The main concern in designing integral field spectrographs for high contrast imaging is the impact of the diffraction effects and the non-common path aberrations together with an efficient use of the detector pixels. We focus our attention on integral field spectrographs based on lenslet-arrays, discussing the main features of these designs: the conditions of appropriate spatial and spectral sampling of the resulting spectrograph's slit functions and their related cross-talk terms when the system works at the diffraction limit. We present a new scheme for the integral field unit (IFU) based on a dual-lenslet device (BIGRE), that solves some of the problems related to the classical TIGER design when used for such applications. We show that BIGRE provides much lower cross-talk signals than TIGER, allowing a more efficient use of the detector pixels and a considerable saving of the overall cost of a lenslet-based integral field spectrograph.
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