Tavrov Alexander V, Nishikawa Jun, Tamura Motohide, Abe Lyu, Yokochi Kaito, Kurokawa Takashi, Takeda Mitsuo
National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan.
Appl Opt. 2008 Sep 20;47(27):4915-26. doi: 10.1364/ao.47.004915.
To attain deeper nulling for an extended incoherent star disk a scheme for an achromatic interfero-coronagraph, incorporating two common-path interferometers in tandem, is proposed. Analytical and numerical predictions of the performance, which are in reasonably good agreement, are presented. The predicted performance improvement, by using two interferometers in tandem, is demonstrated by a preliminary experiment. A star coronagraph based on the proposed technique has the possibility to reach a 10(-10) achromatic nulling contrast for an almost 10(-2) lambda/D effective source size.
为了实现对扩展的非相干恒星盘的更深消零，提出了一种消色差干涉日冕仪方案，该方案串联了两个共光路干涉仪。给出了性能的解析和数值预测，二者吻合度较好。通过初步实验证明了串联使用两个干涉仪可提高预测性能。基于该技术的恒星日冕仪有可能在有效源尺寸接近10^(-2)λ/D的情况下实现10^(-10)的消色差消零对比度。
