The polarization optics for the European Solar Telescope (EST)
The polarization optics for the European Solar Telescope (EST)
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DOI：
10.1117/12.857817
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发表时间：
2010-05
期刊：
影响因子：
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通讯作者：
F. Bettonvil;M. Collados;A. Feller;B. Gelly;C. Keller;T. Kentischer;A. Ariste;O. Pleier;F. Snik;H. Socas-Navarro
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文献类型：
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作者：
F. Bettonvil;M. Collados;A. Feller;B. Gelly;C. Keller;T. Kentischer;A. Ariste;O. Pleier;F. Snik;H. Socas-Navarro
EST（欧洲太阳望远镜）是一个4米级的太阳望远镜，目前处于概念设计阶段。EST将位于加那利群岛，目的是利用一套仪器，以最好的光谱、空间和时间分辨率以及最好的偏振性能观测太阳光球和色球，这套仪器可以有效地产生等离子体在许多尺度高度上的热、动态和磁性的二维光谱偏振信息，范围从λ=350到2300 nm。为了满足对偏振灵敏度和精度的严格要求，从一开始就将偏振测量纳入设计工作。总体理念是使用多种技术的组合，其中包括具有低（且稳定）仪器偏振的望远镜，最佳的全斯托克斯偏振计，差分测量方案，快速调制和解调以及精确校准。目前的基线光学布局包括一个14镜布局，它是偏振补偿和时间不变。在无偏振的F2聚焦中，预留了足够的空间用于校准、调制器和偏振开关。在仪器水平上，单个组件的s面和p面是对齐的，从而形成一个系统，其中特征向量可以不受干扰地通过系统。
EST (European Solar Telescope) is a 4-m class solar telescope, which is currently in the conceptual design phase. EST will be located at the Canary Islands and aims at observations with the best possible spectral, spatial and temporal resolution and best polarimetric performance, of the solar photosphere and chromosphere, using a suite of instruments that can efficiently produce two-dimensional spectropolarimetric information of the thermal, dynamic and magnetic properties of the plasma over many scale heights, and ranging from λ=350 until 2300 nm. In order to be able to fulfill the stringent requirements for polarimetric sensitivity and accuracy, from the very beginning the polarimetry has been included in the design work. The overall philosophy has been to use a combination of techniques, which includes a telescope with low (and stable) instrumental polarization, optimal full Stokes polarimeters, differential measurement schemes, fast modulation and demodulation, and accurate calibration. The current baseline optical layout consists of a 14-mirror layout, which is polarimetrically compensated and nonvarying in time. In the polarization free F2 focus ample space is reserved for calibration and modulators and a polarimetric switch. At instrument level the s-, and p-planes of individual components are aligned, resulting in a system in which eigenvectors can travel undisturbed through the system.