surface (M3) is almost flat, elliptical with a 1.6m major axis and delivers the light beam to the receivers. History INAOE and UMass-Amherst signed the agreement to develop the Large Millimeter Telescope project on 17 November 1994, but construction of the telescope did not begin until 1998. The first observations were taken in June 2011 at 1.1 and 3 mm using the AzTEC camera and Redshift Search Receiver (RSR), respectively. In May 2013, the Early Science phase began, producing over a dozen scientific articles. The official name of the LMT was changed to "Large Millimeter Telescope Alfonso Serrano" on 22 October 2012 in order to honour the initiator of the project, Alfonso Serrano Pérez-Grovas. Instrumentation The set of LMT instrumentation is built by heterodyne receivers and broad-band continuum cameras, some of them still under development: Broad-band continuum TolTEC TolTEC is a three-band imaging polarimeter that has completed laboratory testing and is scheduled to be installed and commissioned on the LMT in the fall of 2021. Once installed, TolTEC will image the sky at three (1.1, 1.4 and 2.1 millimetre) bands simultaneously using 7000 polarization-sensitive kinetic inductance detectors (KIDs). Each TolTEC observation will produce nine independent images - measuring total intensity (I) and two Stokes parameters (Q and U) in all three bands. Because of the nearly ubiquitous presence of dust in our universe, TolTEC's science reach includes cosmology, the physics of clusters, galaxy evolution and star-formation along the history of the Universe, the relation between the star-forming process and the molecular clouds, small bodies of the Solar System, and much more. The TolTEC Project is funded by the National Science Foundation (NSF). Heterodyne Receivers SEQUOIA SEQUOIA operates in the range 85–116 GHz band using a cryogenic focal-plane array of 32 pixels arranged in dual-polarized 4×4 arrays fed by square horns separated by 2 fλ. The arrays are cooled to 18K and use low-noise Indium Phosphide (InP) monolithic microwave integrated circuit (MMIC) preamplifiers designed at UMass to provide a characteristic receiver noise of 55K in the range 85–107 GHz, increasing to 90K at 116 GHz. Redshift Search Receiver (RSR) A novel MMIC-based receiver designed to maximize the instantaneous receiver bandwidth to cover the 90 GHz atmospheric window from 75 to 110 GHz in a single tuning. The receiver has four pixels arranged in a dual-beam and dual polarized configuration. Orthogonal polarizations are combined in waveguide-based orthomode transducers. Beam-switching at 1 kHz