How it works
The 1983 Anderson & Parrish principle of selective photothermolysis is the foundation: melanin in the hair shaft and bulb absorbs a specific wavelength of light, which converts to thermal energy. If the pulse width is shorter than the thermal relaxation time of the follicle (roughly 10-100 ms), the heat destroys the follicular epithelium without spreading to surrounding tissue.
Hair grows in three phases: anagen (active), catagen (regression) and telogen (resting). Only anagen hairs respond because melanin is present. This is why multiple sessions spaced 4-8 weeks apart are required.
Recommended platforms
Pmise DL-07 - 808nm Diode Laser
The gold standard. 808nm penetrates to the mid-dermis where the bulb sits. Suitable for Fitzpatrick I-IV. Fluence 2-80 J/cm2, pulse width 10-100 ms.
Pmise MF-05 - E-Light IPL + RF
Filtered broadband light (610-1200nm) with bipolar RF for cost-effective hair reduction in lighter skin types and larger areas.
| Parameter | Diode (808nm) | IPL (E-Light) |
|---|---|---|
| Wavelength | 808 +- 10 nm | 610-1200 nm |
| Fluence | 2-80 J/cm2 | 10-45 J/cm2 |
| Pulse width | 10-100 ms | 2-10 ms |
| Skin types | I-IV | I-III |
| Cooling | Sapphire contact | Air or gel |