Wednesdays 4:15 pm – 5:00 pm in STB 118
The aim of this series is to hear about the innovative and exciting research that is taking place within our college, thus both faculty and students are encouraged to give a colloquium presentation. Talks should be either 40 - 50 minutes in length for a single presenter colloquium or 20 - 25 minutes in length for a joint colloquium event. If you would like to sign-up to give a CNHS Colloquium Talk, please fill out the following form: Talk Proposal.
For any questions, contact the organizers Heather Kaluna and Efren Ruiz.
Date: 5 March 2025
<<<<<<< HEADSpeaker: Dr. Sebastien Vievard, College of Engineering UH Manoa
=======Speaker: Dr. Sebastien Vievard, College of Engineering UH Manoa
>>>>>>> bf9457ed662c1d5e6c7985c75149e42f3ffff25cTitle: Spectroscopy using a Photonic Lantern at the Subaru Telescope
Abstract: A Photonic Lantern (PL) is a novel device that efficiently converts a multi-mode fiber into several single-mode fibers. When coupled with an extreme adaptive optics (ExAO) system and a spectrograph, PLs enable high throughput spectroscopy at high angular resolution. The Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) system of the Subaru Telescope recently acquired a PL that feeds a R~4,000 spectrograph optimized for the 600 to 760 nm wavelength range. We present here the integration of the PL on SCExAO, and study the device performance in terms of throughput, field of view, and spectral reconstruction. We also present the first on-sky demonstration of a Visible PL coupled with an ExAO system, showing a significant improvement of x12 in throughput compared to the use of a sole single-mode fiber. We also highlight the faithful reconstruction of spectral features of `Aua [Betelgeuse] and discuss how this work lays the foundation for future advancements in high-throughput photonic instrumentation for high-resolution imaging.