Results of the Physical Modeling of a Pulsed Laser for the TMT LGS System Dr. Angel Otarola, on behalf of the TMT AO Team Abstract: This talk will report on the main requirements set for the TMT Adaptive Optics system, and summarizes the results of the physical modeling of a pulsed laser that is an option for the TMT LGS system. In particular, the coupling efficiency of the laser light to the Na atoms in the mesosphere is the most relevant parameter since a high coupling efficiency implies a high photon flux return, or in other words a bright laser guide star. The results of the physical simulations show the pulsed laser performance has the potential to meet the TMT requirements. This talk will also report on the plans intended to perform on-sky tests of the pulsed laser. Brief Bio: Angel Otarola is a Chilean Civil Engineer (field of Geodesy) with a Master and Ph.D. in Atmospheric Sciences from the University Of Arizona. During his career, Otarola has participated in the Site Testing campaign that selected the Chajnantor Site for the deployment of the Atacama Large Millimeter Array (ALMA), and the Site Testing team for the Thirty Meter Project. Since early this year is a member of the Adaptive Optics team at TMT where has been charged with the task to study the performance of potential lasers for the TMT LGS system. On the other hand, is co-PI for the Atmospheric Temperature Ozone and Moisture Microwave Spectrometer (ATOMMS), funded by NSF, an instrument proposed as an alternative for the Earth Observing System.