用于VTT阶梯光谱仪绝对校准的Laser频率梳系统
A Laser Frequency Comb System for Absolute Calibration of the VTT Echelle Spectrograph
摘要：
一个基于激光频率梳（LFC）的波长校准系统是由德国弗莱堡的Kiepenheuer-Institut für Sonnenphysik和德国Garching的Max-Planck-Institut für Quantenoptik合作开发的，永久安装在加那利群岛特内里费岛的德国真空塔望远镜（VTT）上。该系统于2011年10月成功安装。通过同时记录来自太阳和LFC的光谱，对于每次曝光，可以从梳状模式的已知频率导出校准曲线，该校准曲线适合于米每秒水平的绝对校准。我们简要总结了太阳物理学中受益于绝对光谱学的一些主题，并指出LFC与传统校准技术相比的优势。我们还概述了VTT校准系统的基本设置及其与现有中阶梯光栅光谱仪的集成。
英文摘要：
A wavelength calibration system based on a laser frequency comb (LFC) was developed in a co-operation between the Kiepenheuer-Institut für Sonnenphysik, Freiburg, Germany and the Max-Planck-Institut für Quantenoptik, Garching, Germany for permanent installation at the German Vacuum Tower Telescope (VTT) on Tenerife, Canary Islands. The system was installed successfully in October 2011. By simultaneously recording the spectra from the Sun and the LFC, for each exposure a calibration curve can be derived from the known frequencies of the comb modes that is suitable for absolute calibration at the meters per second level. We briefly summarize some topics in solar physics that benefit from absolute spectroscopy and point out the advantages of LFC compared to traditional calibration techniques. We also sketch the basic setup of the VTT calibration system and its integration with the existing echelle spectrograph.
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