Phase pulses were the concentrated phase-modulated energy discharges produced by some types of phase weapons.
Phase pistols used by the MACO fired phase pulses. A pulse could be set for stun or kill. In 2154, Talas was shot with a MACO phase pistol set to kill. Although she was only grazed, being an Andorian she was especially susceptible to phase pulse infections, and subsequently died of her injuries. (ENT: "Babel One")