In 2368, Commander William Riker and the J'naii scientist Soren used a series of photon pulses fired from two type 4 phasers, with which their shuttlecraft had been fitted, to chart the outline of a null space pocket into which a J'naii shuttle had disappeared. They were able to obtain a map the perimeter of the pocket by charting where each pulse disappeared into the null space. (TNG: "The Outcast")
In 2374, an Kovin's starship was equipped with photon pulses. When Kovin fired a spread of photon pulses, from the bow of his ship, at the USS Voyager. In the opening volley, the pulses lowered Voyager's deflector shield strength down to 82%, and by the time his assault was complete, he had completely disabled Voyager's shields.