Photon burst
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The Photon Burst launcher was a hand-held heavy weapon designed in part by Perfecto Oviedo, and used by the USS Voyager's Hazard Team from 2376 until the ship's return to the Alpha Quadrant.
These weapons fired miniature Photon torpedoes that were capable of killing enemy infantry with a single blast at long range. However, they were typically used against heavily armored targets which standard phaser fire could not sufficiently harm.
The Photon Burst's employment in any capacity had to be approved by Captain Kathryn Janeway before it could be used, due to it's highly destructive design.
