Picosecond Pulse · Photoacoustic · CityLink Mall
The difference between a picosecond laser and the nanosecond devices before it is not power — it is time. Compressing the pulse a thousandfold shifts the mechanism from heating pigment to mechanically shattering it, and less heat in the tissue means less of the inflammation that drives pigmentation in Asian skin.
Wavelength decides what a laser hits. Pulse duration decides what happens when it gets there. A Q-switched laser delivers energy over nanoseconds — billionths of a second. A picosecond laser delivers it over picoseconds, trillionths of a second, roughly a thousand times faster. The total energy may be comparable. The consequence in the tissue is not.
Every target has a thermal relaxation time: the period it takes to shed roughly half the heat it has absorbed. Deliver energy slower than that and heat escapes into surrounding tissue as the pulse proceeds. Deliver it faster and the heat is trapped in the target. A nanosecond pulse is already shorter than the relaxation time of a melanosome, which is why Q-switched lasers work at all — but a picosecond pulse is shorter by three orders of magnitude, and at that timescale something different happens.
Energy deposited that rapidly cannot dissipate as heat at all. It produces an abrupt local pressure rise and a propagating acoustic wave, and the pigment particle is fractured by mechanical stress rather than cooked. This is the photoacoustic effect, and it is the entire basis of the picosecond advantage. The particle is broken into smaller fragments than thermal disruption produces, and smaller fragments are cleared more efficiently by the macrophages that must carry them away.
The clinical consequences follow directly. More complete fragmentation means better response in targets that resisted nanosecond treatment — dense dermal pigment and tattoo inks in particular. Less heat delivered into surrounding tissue means less inflammation, and since post-inflammatory hyperpigmentation in Fitzpatrick III to V skin is driven precisely by inflammation, the risk of trading one pigmentary problem for another falls. Fractionated handpieces add a second mechanism, concentrating energy into microscopic zones that induce dermal remodelling with minimal surface disruption.
What Changes
Picosecond devices are frequently marketed as superior to everything preceding them, which overstates the case. The advantage is real but specific, and it matters most in particular targets and particular skin types. Where it does not apply, an older device at the right settings remains entirely appropriate.
Picosecond is not a stronger laser. It is a faster one — and speed is what turns heating pigment into breaking it.
The Decision
Atelier Aesthetics uses DEKA platforms including the TORO pico laser, and Dr. Sin Yong is an International Key Opinion Leader for DEKA — which matters here mainly because device parameters, not brand, determine outcomes, and familiarity with a platform's behaviour across skin types is what allows settings to be chosen confidently rather than copied from a default. The T2 Frax Radiance protocol is the practice's structured application of that platform for pigmentation and tightening in Asian skin.
The choice between picosecond and nanosecond is made per target. Melasma is the clearest illustration: even with a picosecond device, the correct approach remains low energy and gradual, because the problem is melanocyte hyperresponsiveness rather than particle size, and a picosecond laser used aggressively provokes rebound just as a nanosecond one does. For melasma the mechanism advantage is modest and low-fluence toning remains central. For dense dermal pigment and tattoo, the advantage is substantial.
Nothing here removes the need for the ordinary disciplines. Pigment lasers of any pulse duration require strict photoprotection between sessions, avoidance of treatment on recently sun-exposed skin, and a diagnosis established before treatment begins — because pigmentation that looks alike can be melasma, lentigines, post-inflammatory change or something that is not pigment at all. Fractional picosecond work is also used for texture and scarring, where its low thermal footprint is an advantage in skin prone to pigmenting after injury.
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