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Pulse duration (pulse width) is how long each burst of laser energy lasts. Matching it to the size of the target—via the target's thermal relaxation time—is what lets a laser heat and destroy a structure without damaging the skin around it.
Pulse duration is the length of time the laser fires in a single shot—ranging from milliseconds (ms) for hair and vessels, to nanoseconds (ns) for Q-switched pigment work, to picoseconds (ps) for the newest tattoo and pigment lasers.
The principle that ties it together is thermal relaxation time: every target cools at a rate set by its size. To confine heat to the target and protect surrounding tissue, the pulse should be equal to or shorter than the target’s cooling time. Large targets (a coarse hair follicle) tolerate longer pulses; tiny targets (a pigment particle) need ultra-short pulses to be shattered before the heat spreads. Get this wrong and energy diffuses into the skin as collateral damage.
Adjustable pulse duration is therefore a mark of a capable platform—it lets one device safely treat different targets and adapt to different skin types.
Match the pulse to how fast the target cools: short enough to confine the heat, long enough to do the work.
Selective photothermolysis is the founding principle of modern laser therapy: by choosing
Q-switched describes a laser that releases its energy in extremely short, high-power nanos
Thermal relaxation time (TRT) is how long a heated target takes to lose half its heat.
Pulse duration (pulse width) is how long each laser pulse lasts—matched to a target's thermal relaxation time so energy destroys the target without harming surrounding skin. An essential laser parameter for hair removal, pigment and tattoo treatments.
