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...This is achieved by monitoring a TTL signal via the computer LTP1 port, whose signal is transmitted via RS232 to the laser unit, also used to control basic laser parameters, like pulse divider (laser frequency) and Q-Switch. The Shutter modulation feature allows the user to use the TTL signal to open the laser shutter on demand, controlling the length of the laser pulsed as desired. This method yields reproducible full power laser pulses. The original motivation was to interface mass spectrometer data systems to diverse laser systems. Developed by: Jair Menegon, Paulo Moreira and Thiago Correra - University of São Paulo - Brazil.