Laser hair removal uses concentrated light to target melanin in the hair bulb. When pigment absorbs the light, it converts to heat, damaging the follicle and delaying regrowth.
How Lasers Target Melanin
- Selective photothermolysis focuses energy on dark pigment, sparing surrounding skin.
- Pulse duration and wavelength are adjusted for safety.
Light Energy → Heat Energy
- The absorbed photons raise follicular temperature above 70 °C, denaturing hair‑matrix cells.
Types of Lasers & Best Candidates
| Laser | Wavelength | Best Skin Types | Notes |
|---|---|---|---|
| Alexandrite | 755 nm | I–III | Fast repetition; effective on fine hair |
| Diode | 810 nm | I–IV | Versatile; deeper penetration |
| Nd:YAG | 1064 nm | IV–VI | Safest for dark skin; lower melanin absorption |
“Lasers emit light absorbed by hair pigment, damaging the follicle.” — American Academy of Dermatology
https://www.aad.org/public/everyday-care/hair-scalp-care/hair-removal/laser-hair-removal-faqs
AAD summary: Explains mechanism, ideal candidates, and typical results.