Pico Laser

Picosecond (pico) lasers mark a major technological step in medical and aesthetic dermatology, moving away from the traditional photothermal mechanism to a photomechanical (photoacoustic) one. With pulses lasting only trillionths of a second, a pico laser delivers a very large burst of energy in an extremely short time. This creates a shockwave that shatters melanin granules or tattoo ink into microscopic, dust-like fragments without building up excess heat in the surrounding tissue.

At Haute-Derma, we use pico laser technology as a gold-standard treatment for complex pigment disorders (melasma, Hori's nevus, freckles, PIH), for safe tattoo removal and for advanced skin rejuvenation through the formation of microscopic dermal vacuoles (LIOBs).

Optical Principles and Photomechanical Pigment Clearance

Compared with older Q-switched nanosecond lasers, picosecond lasers offer clear advantages grounded in advanced optical physics:

Refined selective photothermolysis: the thermal relaxation time (TRT) of melanosomes in the skin is roughly 50 to 500 nanoseconds. When pulse duration drops to the sub-nanosecond range (300–750 picoseconds), the pulse is far shorter than the melanosome's TRT. Energy is delivered so quickly that heat has no time to escape into the surrounding healthy cells.
Photoacoustic shockwave effect: instead of burning pigment with heat, the pico laser concentrates a very high peak power into a mechanical wave that strikes the target pigment directly. Melanin is broken into ultra-fine particles that macrophages and the lymphatic system can engulf and clear quickly, so far fewer treatment sessions are needed.
Microscopic dermal vacuoles (laser-induced optical breakdown, LIOBs): with a fractional or micro-lens array (MLA) handpiece, the pico laser focuses high-density energy into microscopic points in the dermis without damaging or peeling the surface epidermis. LIOBs create tiny cavities and pressure waves that release growth factors (TGF-β, bFGF), triggering the skin's natural wound-healing response and strong regeneration of new collagen and elastin.

Pico Laser Wavelengths and Clinical Indications

Wavelength	Penetration Depth	Main Target (Chromophore)
KTP (potassium titanyl phosphate) 532 nm	Shallow (epidermis)	Oxyhemoglobin and superficial melanin
Alexandrite (solid-state) 755 nm	Intermediate (epidermis to papillary dermis)	Melanin (absorbed about 3 times more than at 1064 nm, with very little absorption by water or blood vessels)
Nd:YAG (neodymium-doped YAG) 1064 nm	Deep (deep dermis)	Deep melanin and dark tattoo ink

Treatment Protocol and Parameter Fine-Tuning at Haute-Derma

Pigment analysis with skin OCT/dermoscopy: we determine how deep the melanin lies (epidermal, dermal or mixed) and check the integrity of the dermo-epidermal junction (DEJ) to choose the right wavelength (532 nm for superficial pigment, 1064 nm or 755 nm for deeper pigment).
Setting Fluence and Spot Size
- Safety rule: the larger the spot size, the deeper the beam penetrates. For sensitive melasma, we use a large spot (6–10 mm) at low fluence (0.8–1.5 J/cm²) to avoid stimulating melanocytes into rebound pigmentation.
- Toning mode (laser toning): broad, gentle passes that clear pigment gradually over several sessions.
- Fractional mode (MLA micro-lens): used for rejuvenation, refining pores and filling atrophic scars through the LIOB effect.
Recovery and Prevention of Post-Inflammatory Hyperpigmentation (PIH)
- Immediately after treatment, we apply exosome iontophoresis or a light layer of topical corticosteroid, together with cold-air spray and ice packs, to quench any residual heat reaction at once.
- Topical tyrosinase inhibitors (tranexamic acid, alpha-arbutin, azelaic acid) are always prescribed, along with a broad-spectrum sunscreen for thorough sun protection.

Picosecond vs. Q-Switched Nanosecond Lasers

Feature	Picosecond Laser	Q-Switched Nanosecond Laser
How pigment is destroyed	Photoacoustic: shattered by shockwaves	Photothermal: burned by heat
Size of melanin fragments	Micro-dust, cleared very quickly	Pebble-sized, cleared more slowly
Side effects and PIH	Very low, as no excess heat builds up in healthy tissue	Higher, with a greater risk of minor burns, depigmentation or rebound PIH
Typical number of sessions	30–50% fewer than Q-switched (usually 4–6 sessions)	Longer course (usually 8–12 sessions)
Downtime	Almost none (mild redness fades within 2–4 hours)	Redness and stinging for 24–48 hours, often with crusting

Frequently Asked Questions (FAQs)

+Can pico laser cure melasma 100% so it never comes back?

No laser technology can guarantee a permanent, 100% cure for melasma, because melasma is a chronic pigment disorder linked to hormones, genetics and UV exposure. Pico laser can safely fade 80–90% of existing pigment without damaging the tissue. To keep the results and prevent relapse, patients need to protect their skin from the sun diligently, keep using pigment-inhibiting topicals and manage hormonal factors as advised by their doctor.

+Why does pico laser rejuvenation with a honeycomb micro-lens array (MLA) improve scars and pores without peeling the skin?

Thanks to laser-induced optical breakdown (LIOBs), the focused pico micro-beams concentrate extremely high peak energy to create tiny vacuole injuries that sit entirely below the surface, in the dermis. The epidermis stays intact, with no breaks or peeling. Collagen production is therefore strongly stimulated from beneath while the skin surface does not flake or bleed, so patients need no downtime.

+After pico laser, do I need to avoid water or any foods?

With pico toning or fractional rejuvenation modes, the skin is not broken, so there is no need to avoid water: you can gently wash your face with cool water after a few hours and go about your day as normal. After spot treatment of age spots or tattoo removal, where a thin crust may form, simply avoid rubbing hard for the first 3–5 days and let the crust fall off naturally. There are no strict dietary restrictions unless you have a particular allergy.