Rather than using a single powerful beam, the Pulse Laser fires a series of rapid pulses. The Small Pulse Laser is the smallest and lightest of the Pulse Laser family. In comparison to the lighter standard Small Laser, the Small Pulse version doesn't have a shorter range, but neither does it do more damage. Instead, its increased weight and heat is offset by the short beam duration, roughly 33% shorter, allowing more damage to focused on one area.
The low damage of the small pulse laser when compared the Medium Laser, which weighs the same, generally means it isn't used much to great effect. This weapon is best used by light 'Mechs against other lightly armored Light 'Mechs. Their pinpoint accuracy and short beam duration ensures as much damage as possible is dealt to fast and maneuverable targets.