THE LGSF LASER SYSTEM - Thirty Meter Telescope

TMT.AOS.DRD.09.003.DRF05 Page 10 of 30REQUIREMENTS DOCUMENT FOR THE LGSF LASER SYSTEM August 25, 2009Figure 1: LGSF Optical Block Diagram2.2 SYSTEM FUNCTIONSThe Laser System will provide the following system functions:- Generate the laser light sources required for the NFIRAOS asterism with the properpower level, spectral and temporal characteristics, and image quality.- Be upgradeable to generate the laser light sources needed by the MOAO system.2.3 USER AND OPERATOR CHARACTERISTICSThe Laser System is under the software control of the AO Sequencer (which is a subsystemof the AO Executive Software) during daytime and nighttime operations. Theseoperations include startup, observation, and shutdown operation modes.The users of the Laser System are:- The laser technicians and laser engineers. During commissioning operations, thelaser technicians/engineers perform all the functions required to start the LaserSystem, optimize performance before the LGS observations, monitor and maintainthe Laser System performance during observations and then shutdown the LaserSystem at the end of the LGS observations. During scheduled maintenanceperiods, the laser technicians/engineers perform all the maintenance activitiesrequired by the Laser System.