Field burst was a specialized phaser setting.
After having traveled back in time from 2368 to 1893, Lieutenant Commander Geordi La Forge was able to activate the Devidians' ophidian by tuning his phaser to the approximate frequency of triolic waves used by the Devidians, and laying down a field burst. (TNG: "Time's Arrow, Part II")
The visual effect of the "field burst" was identical to the standard phaser beam effect.
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