Science Seminars

Cutting edge multi-object and imaging spectroscopy technologies for the far-ultraviolet regime

Speaker: Dmitry Vorobiev (LASP)
Date: Thursday, Dec 03, 2020
Time: 4:00 pm
Location: Zoom

Seminar Abstract:

In this seminar, I will present an overview of current efforts at LASP to develop technologies and instruments that can enable a variety of spatially multiplexed spectroscopic techniques for space-based missions operating in the far-UV regime. For several decades, ground-based astronomers have enjoyed the benefits afforded by spatially multiplexed spectroscopy. Multi-object spectrographs based on optical fibers, first positioned with humble punch-plates and later by robots, enabled massive spectroscopic surveys of stars and galaxies. On smaller scales, tightly packed fiber bundles were used to build integral field spectrographs, which enable studies of extended objects with fine spatial and spectral resolution. Others performed spatial multiplexing using adjustable multi-slit positioners, image slicers, and other micro-opto-electro-mechanical systems (MOEMS), such as micromirror and microshutter arrays. These approaches have been difficult to adapt for space-based missions working the far ultraviolet regime. In some cases, it was due to the mechanical complexity of the systems (e.g. robotic positioners) or lack of suitable optical materials and coatings (e.g. lack of UV-transmitting optical fibers). In the solar and stellar group, we are developing several technologies (and missions/instruments) that enable many of the techniques familiar to ground-based astronomers to be used in space. This includes multi-object spectroscopy using micromirror devices (SUMO, UMIS), imaging spectroscopy using image slicers (INFUSE), and fiber-fed spectrographs (TUFFI) using far-UV transmitting optical fibers.