Pico and conventional laser toning: pulse duration, heat, and pressure

Pulse duration means how long one burst of laser energy is delivered. A picosecond is 10⁻¹² seconds; a nanosecond is 10⁻⁹ seconds. Pico lasers and Q-switched lasers use different pulse ranges even when both operate at 1064 nm.

Longer-pulse treatments use a different timing pattern again. Device and mode determine actual values, so examples from one machine are not settings to transfer to another.

Delivering comparable energy in a shorter time can increase instantaneous power. Rapid absorption, heating, and expansion can generate pressure waves that help fragment pigment structures.

This photomechanical or photoacoustic effect is important in short-pulse pigment and tattoo treatments. It does not mean heat is absent, or that surrounding tissue cannot be affected.

Photothermal action uses absorbed light to heat a target. Temperature and exposure time influence changes such as protein denaturation, coagulation, or thermal injury to a vessel or hair follicle.

Different targets require different approaches. Vascular treatment, hair reduction, and some skin-remodelling procedures may rely more on controlled heating than on pigment fragmentation.

Thermal relaxation time (TRT) describes how long a heated target takes to lose roughly half of its temperature rise to its surroundings. Larger structures generally have longer relaxation times than smaller ones.

Choosing a pulse in relation to the target's relaxation time helps limit unwanted spread of heat. This is a physical principle, not a complete treatment recipe; absorption, fluence, geometry, and tissue properties matter as well.

Pico toning, Q-switched toning, and treatments commonly called Genesis can use 1064 nm light but differ substantially in timing and intended tissue response.

The original uses particular device examples to illustrate very short, short, and longer pulses. Those figures explain the principle; they are not universal values or instructions for treating an individual.

Ask which structure is being targeted, which wavelength and pulse mode are planned, and whether the intended effect is primarily pigment fragmentation or heating.

The shortest pulse is not a universal upgrade. Physical differences should be connected with clinical evidence, your diagnosis, and the safety plan before deciding between treatments.