Diode Laser Hair Removal — Dual-Wavelength Permanent Reduction

FaceExpert's laser hair removal programme uses an advanced diode laser system combining two wavelengths — 810 nm and 755 nm — for superior efficacy across the full spectrum of hair types, from fine light hair to coarse pigmented hair. The dual-wavelength combination targets melanin in the hair follicle at two absorption peaks, enabling permanent hair reduction with fewer sessions than single-wavelength devices. Treatments cover the complete body map: face (upper lip and chin), underarms, arms, bikini and intimate areas, legs, abdomen, chest, and back. Single-session prices range from 650 Kč (upper lip) to 4,900 Kč (back), with package rates available from 3,500 Kč for combined areas. FaceExpert brands their hair removal programme as 'Nová éra laserové epilace' (New Era Laser Epilation) — reflecting the clinic's focus on the upgraded dual-wavelength technology over standard 810 nm-only diode lasers. Multiple sessions are required for permanent reduction, as laser can only target hairs in the active growth (anagen) phase.

Laser hair removal at FaceExpert uses a diode laser system combining the 810 nm and 755 nm wavelengths — a technically significant upgrade over single-wavelength 810 nm diode lasers that represent the legacy standard in the market. Understanding why two wavelengths outperform one requires understanding the physics of laser-melanin interaction. **Why dual wavelength (810 nm + 755 nm) matters:** Melanin — the chromophore targeted by hair removal lasers — absorbs light across a broad spectrum from approximately 600–1,100 nm, but its absorption coefficient peaks sharply at shorter wavelengths and diminishes progressively at longer ones. The 755 nm alexandrite wavelength sits at a higher absorption coefficient for melanin than the 810 nm standard diode wavelength — meaning it deposits more energy per unit of melanin, translating to higher efficacy for finer and lighter-pigmented hair types that have less total melanin to absorb energy. The 810 nm wavelength penetrates slightly deeper into the follicle bulb (1.5–2.5 mm) and is better suited to coarser, more pigmented hair. By combining both wavelengths in a single treatment head, the FaceExpert system simultaneously targets the full range of follicle depths and hair melanin concentrations in each pulse — requiring fewer sessions to achieve permanent reduction across diverse hair types. **Mechanism of permanent hair reduction:** Each laser pulse heats melanin within the hair shaft and follicle bulge — the stem cell zone responsible for hair regeneration. The thermal energy diffuses from the melanin-rich hair to the surrounding follicle structures (bulge and dermal papilla). At temperatures of 65–70°C, these structures are thermally damaged and can no longer produce a new hair cycle. This is the basis of permanent reduction — not removal of individual hairs, but destruction of the follicle's regenerative capacity. **Why multiple sessions are required:** Only hairs in the anagen (active growth) phase have a hair shaft fully present within the follicle connecting the papilla to the bulge — the thermal conduction pathway that allows energy to travel from shaft to follicle. At any given time, body areas have 20–30% of hairs in anagen; 70–80% are in telogen (resting) or catagen (transitional) phases and are unresponsive to laser. Sessions are scheduled every 4–8 weeks (depending on the body area — shorter cycles in fast-cycling areas like the face, longer for slower areas like the back) to treat successive cohorts of hairs as they enter anagen. **Areas and prices at FaceExpert:** Facial areas: Upper lip 650 Kč | Chin 800 Kč. These small zones often require 6–8 sessions due to hormonal hair cycling in the lower face. Single sessions are priced accessibly for ongoing treatment. Upper body: Underarms 1,500 Kč — typically the fastest-responding area (4–6 sessions for 80%+ reduction). Forearms 1,900 Kč. Full arms 2,500 Kč. Torso: Lower abdomen 1,800 Kč. Chest 2,900 Kč. Back 4,900 Kč — back is the largest body area and typically requires 6–8 sessions; packages are strongly recommended. Intimate areas: Bikini lines 1,900 Kč. Brazilian (complete intimate area) 3,900 Kč. These areas have a shorter growth cycle — 4–6 week inter-session intervals. Legs: Calves 2,900 Kč. Full legs 3,900 Kč. Thighs 1,900 Kč. Packages: Area combinations 3,500–5,500 Kč — structure not published; confirmed by enquiry. **The session experience:** A cooling gel is applied. The diode laser handpiece is moved systematically over the treatment area. The integrated cooling system (contact cooling plate or air cooling) protects the epidermis surface while thermal energy penetrates to the follicle. Sensation ranges from mild warmth to a brief elastic snap at each pulse, depending on the area's hair density and skin sensitivity. No topical anaesthesia is required for most body areas; a cooling cream can be arranged for sensitive zones. **Post-session care:** Redness and follicular swelling (resembling goosebumps) resolves within 1–4 hours. Treated hairs shed over 1–3 weeks — this is the damaged hair shaft being expelled. Avoid hot environments, intensive exercise, and sun exposure for 48 hours post-session. SPF 50+ on treated areas is mandatory. **Contraindications:** Active tan or self-tan (high burn risk), darker Fitzpatrick types (IV–VI — settings adjustment required; individual assessment needed), photosensitising medications, pregnancy, active skin infection in the treatment zone.