12th International Conference on Optics, Photonics & Lasers
Institute of Optics and Electronics,China
Title: Fast visible imaging spectrometer for 1.8-m solar telescope CLST
Biography: Yangyi Liu
The Fast Visible Imaging Spectrometer (FVIS), which consists of three rotating pre-fi lters, an air gap based Fabry-Perot interferometer (FPI) and an imager, is being developed as one of the post instruments of the 1.8-m Chinese Large Solar Telescope (CLST). The FPI is placed behind the adaptive optics system to acquire the high resolution solar images. By changing the plate separation of FPI, the position and gap of a series of equidistant transmission peaks are tunable. Multiple by the unchanged transmission profile of the pre-filters, the transmission peak at working wavelength is selected. The centre wavelength of three pre-filters are at 5890, 6562.8 and 8542 angstrom corresponding to the Na I, Hα and Ca II line of the solar spectrum respectively. By changing the pre-filters with a rotator, the FVIS is able to image at three wavelengths with resolving power about [email protected], [email protected] and [email protected] Th e FVIS can image at tens of different wavelength positions in a few seconds because the quick response of the Piezoelectric actuators for cavity length regulation. In this presentation, the scientific requirement, design, parameters and experiment plan of the FVIS will be presented.