Achromatic interfero-coronagraph with two common-path interferometers in tandem.
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.
Tavrov
Alexander V
AV
National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan. alexander.tavrov@nao.ac.jp
Nishikawa
Jun
J
Tamura
Motohide
M
Abe
Lyu
L
Yokochi
Kaito
K
Kurokawa
Takashi
T
Takeda
Mitsuo
M