Atacama Sub-Millimeter Telescope Experiment Polarimeter (APol) I: Design and Lab-Test Result

The Atacama Submillimeter Telescope Experiment (ASTE), a 10-m aperture telescope, hosts a camera equipped with the Transition Edge Sensor (TES). We developed a fore-optics module-"APol," to convert the 271 pixels of the TES working at 350 GHz into a sensitive imaging polarimeter without sacrificing the image quality and the 7.50 field of view. Here, we describe the detailed optical design of APol and present the results of the preliminary test in a laboratory. (C) 2020 Optical Society of America