 Upon the optical bench, the instrument contains three Beam Dither Units (BDU), three beam expanders, three star trackers, and three HOMER lasers.The three HOMER lasers built and installed on GEDI were built by D. Barry Coyle, Furqan L. Chiragh, and Erich A. Frese.The GEDI instrumentation is designed to collect data between 51.6° N latitude and 51.6° S latitude.