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Continuous wave lasers emit a steady, uninterrupted beam; pulsed lasers deliver energy in discrete bursts. Pulsing allows tissue to cool between shots, which is what makes modern selective, low-risk treatment possible.
Lasers deliver energy in one of two modes. A continuous wave (CW) laser emits an unbroken beam for as long as it is firing; a pulsed laser breaks its output into discrete, timed bursts.
The shift from CW to pulsed delivery is much of what made aesthetic lasers safe. A continuous beam keeps depositing heat with no chance for tissue to recover, so collateral damage accumulates. Pulsing—especially when the pulse is matched to the target’s thermal relaxation time—lets the skin shed heat between shots, confining damage to the intended target. This is the practical machinery behind selective photothermolysis. Some modalities still use quasi-CW or ‘super-long-pulse’ modes for specific jobs, but controlled pulsing dominates modern practice.
On a spec sheet, the available pulse modes and repetition rate tell you how flexibly and how safely a device can be run.
Pulsing is not a detail—the gaps between bursts are what let the skin cool and the treatment stay safe.
Pulse duration (pulse width) is how long each burst of laser energy lasts.
Selective photothermolysis is the founding principle of modern laser therapy: by choosing
Thermal relaxation time (TRT) is how long a heated target takes to lose half its heat.
Continuous wave lasers emit a steady beam while pulsed lasers fire in discrete bursts that let tissue cool between shots—the delivery mode behind safe, selective laser treatment. A foundational laser-physics concept.
