A passive Q-switched pulsed Nd:YAG laser system was built for TOF (time-of-flight) laser range finder. The main goal is to build a TOF laser rangefinder transmitter operating at 1064 nm with 25 mJ output energy, 22 mm beam diameter, 15 ns pulse width, 0.5 mrad beam divergence. Construction and characterization of the laser cavity components including the function of the component for the laser transmitter and factor affect the performance are presented. In our design it is possible to use the transmitter in other applications using its compact dimension and power supply mobility by using batteries and also exploiting the narrow angle of the output transmitter with power reaches distance up to 15 km.