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Achromatic broadband nulling using a phase grating
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DOI：10.1364/OPTICA.4.000110.png)
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Abstract
En 中文
In nulling interferometry, an on-axis source such as a star is interferometrically attenuated (nulled) so that the surrounding area can be investigated for fainter objects. One challenge in nulling interferometry is to achieve a deep achromatic null with a simple optical system. One such system is a fiber nuller, a nulling interferometer in which light from two incoming beams is combined at the tip of a single-mode optical fiber. This Letter describes the use of a diffraction grating to adjust the phase of the light so that achromatic destructive interference is achieved at the fiber tip. A deep (4 x 10(-5)) achromatic null was achieved in the astronomical K-band, thus showing a performance with the potential for observing brown dwarfs and bright (young or hot) extrasolar giant planets.
Keywords:
KECK INTERFEROMETER NULLER
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