Tarsina, Valeria (2025) Characterizing the transmission of three MICADO filters at cryogenic and room temperatures. Bachelor's Thesis, Astronomy.
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Abstract
MICADO (Multi-AO Imaging Camera for Deep Observations) is an adaptive optics instrument designed for high resolution imaging at near-infrared wavelength and it will be deployed in 2030 on the Extremely Large Telescope (ELT). MICADO will feature a wide range of filters, masks and stops that will operate at a temperature of 82 K. The filters and their corresponding samples are coated by the companies Cilas and SCHOTT according to the requirements defined by NOVA. Two filters of each specific kind were coated to ensure that one could serve as a spare. This report focuses on measuring the transmission of the [FeII], H-continuum and I-long filters at room (293 K) and cryogenic (84 K and 100 K) temperatures in order to asses their performance. The measurements show that the transmission curves shift towards shorter wavelengths at lower temperatures. We determined that both [FeII] filters comply with the specifications and they will be accepted. One of the H-continuum filters does not comply with the requirements and hence, it will be kept as a spare, while the other will be integrated in MICADO. The I-long filters showed a large number of coating defects, which could lead to stray light effects that, in turn, might affect photometry and high contrast imaging. Thus, it was decided to reject these two filters, even if the transmission curve of the sample satisfied the requirements.
| Item Type: | Thesis (Bachelor's Thesis) |
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| Supervisor name: | Tolstoy, E. |
| Degree programme: | Astronomy |
| Thesis type: | Bachelor's Thesis |
| Language: | English |
| Date Deposited: | 15 Jul 2025 07:40 |
| Last Modified: | 15 Jul 2025 07:40 |
| URI: | https://fse.studenttheses.ub.rug.nl/id/eprint/36174 |
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