Fluence is the amount of laser energy delivered to a set area of skin, measured in joules per square centimeter (J/cm²). It determines how forcefully a pulse hits tattoo ink or pigment. Too little does nothing; too much risks the skin—so choosing the right fluence is central to safe, effective removal.
What Fluence Means
Fluence describes how much laser energy is packed into a given patch of skin. It is expressed as joules per square centimeter (J/cm²)—essentially energy divided by the size of the treated spot. Think of it as the intensity of each pulse rather than how many pulses are delivered. Two treatments can use the same laser and the same wavelength yet feel and perform very differently depending on the fluence chosen.
Fluence works hand in hand with two other settings: the wavelength (which color of light the laser emits) and the spot size (how wide each pulse lands). Change the spot size and the fluence shifts too, because the same energy is now spread over a different area. That interplay is why laser removal is a clinical decision, not a fixed recipe—the right number for one person's tattoo or scar can be wrong for another's.
Why Fluence Matters for Tattoo and Scar Removal
For tattoo removal, fluence has to be high enough to fracture the ink. Below a certain threshold, the light simply passes through without producing the rapid photomechanical effect that shatters pigment into particles your body can clear. Set it too low and sessions accomplish little; the tattoo barely fades no matter how many visits you book.
Push fluence too high, though, and the risk shifts to your skin—blistering, prolonged irritation, or unwanted changes in texture or tone. The goal is the effective window: enough energy to break down ink or target pigment while respecting your skin type and how it responds. Deeper or denser ink, stubborn colors, and different skin tones all change where that window sits, which is why fluence is adjusted over a course of treatment rather than locked in on day one. For scar-related pigment and discoloration, the same balancing act applies, and honest expectations matter—results vary and complete clearance is never guaranteed.
- Measured in joules per square centimeter (J/cm²)
- Too low: ink barely responds and sessions underperform
- Too high: raises the risk of blistering or skin-tone changes
- Adjusted per skin type, ink color, depth, and how you heal
How Laser Eraser Sets Fluence
At Laser Eraser, the fluence for every pulse is chosen by a physician—not a technician—using the PicoWay® picosecond laser. Founder Dr. Alvaro Alban, an emergency-medicine physician who pursued specialized training at the Institute for Laser Medicine in Skippack, Pennsylvania, built the practice around doctor-administered care precisely because settings like fluence carry real clinical weight. The right energy for your skin type and ink colors is a medical judgment, and it can change from session to session as your tattoo responds.
That physician-led approach is a genuine differentiator from franchise chains and spas, where a fixed protocol may be applied regardless of how your skin is healing. Reading your response, watching for the correct endpoint, and easing or advancing the energy over time is part of what makes removal both safer and more effective. Most tattoos take roughly 8 to 12 sessions to fully remove, and our flat-rate Complete Removal Packages cover every one of those sessions at a single fixed price, starting tailored to your tattoo.
Frequently asked questions
There is no single correct number—the right fluence depends on your skin type, the ink's color and depth, and how your skin is healing. It has to be high enough to fracture the pigment but low enough to protect the skin. That is why a physician selects and adjusts it for each session rather than applying one fixed setting to everyone.