From Event: SPIE Optical Engineering + Applications, 2017
Despite recent advances in high-contrast imaging techniques, high resolution spectroscopy for characterization of exoplanet atmospheres is still limited by our ability to suppress residual starlight speckles at the planet’s location. We have demonstrated a new concept for speckle nulling by injecting directly imaged planet light into a single-mode fiber, linking a high-contrast adaptively-corrected coronagraph to a high-resolution spectrograph (diffraction-limited or not). The restrictions on the incident electric field that will couple into the single-mode fiber give the adaptive optics system additional degrees of freedom to suppress the speckle noise on top of destructive interference. We are able to achieve a starlight suppression gains that are an order of magnitude better than conventional techniques in broadband light with minimal planet throughput losses.
N. Klimovich, Y. Xin, D. Mawet, G. Ruane, J.-R. Delorme, W. Xuan, D. Echeverri, M. Randolph, J. Fucik, J. K. Wallace, J. Wang, G. Vasisht, R. Dekany, B. Mennesson, E. Choquet, and E. Serabyn, "Utilizing active single-mode fiber injection for speckle nulling in exoplanet characterization," Proc. SPIE 10400, Techniques and Instrumentation for Detection of Exoplanets VIII, 104000Y (Presented at SPIE Optical Engineering + Applications: August 09, 2017; Published: 1 September 2017); https://doi.org/10.1117/12.2275173.
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