Preliminary Laboratory Test for the Fred Young Submm Telescope Holography
Abstract
A novel highfrequency holography system is developed for measuring the surface shapes of the two mirrors of the Fred Young Submm Telescope (FYST). It operates at 295.74GHz (wavelength of $1.0137$mm) and measures the complex (amplitude and phase) beam maps in near field. The system is designed to achieve a measurement accuracy of $<3\mu$m and 100mm spatial resolution for mirror error maps. A new inference approach is studied to resolve the surface error maps of the two mirrors from 4 or more measured beams. We employ the new system to a 1/15thscale FYST telescope constructed in our laboratory and test the system feasibility. The spatial resolution of the lab system is changed to 10mm. A conventional onebeam holography is firstly carried out. Measured data is analyzed by the wellknown Fourier Optics technique and our new inference approach. The artificial errors on the mirrors are measured with a statistic error of $<1\mu$m. The results also prove that the new inference approach is generally applicable for conventional onebeam holography analysis.
 Publication:

Physics and Chemistry of Star Formation: The Dynamical ISM Across Time and Spatial Scales
 Pub Date:
 February 2023
 Bibcode:
 2023pcsf.conf..355R