Is a device that allows the selection of individual pulses from a train of laser pulses. It is used to control the timing and repetition rate of the laser pulses. The pulse picker works by using an electro-optic crystal to change the polarization of the laser beam (Pockels effect). The crystal is placed in the path of the laser beam and is controlled by an electrical signal. When the electrical signal is applied, the crystal changes the polarization of the laser beam, which allows it to pass through a polarizer and reach the output. When the electrical signal is not applied, the crystal does not change the polarization of the laser beam, which causes it to be blocked by the polarizer and not reach the output.
