755nm Alexandrite Clinical Profile
The 755nm Alexandrite wavelength is characterized by its extremely high absorption coefficient for melanin. This makes it the absolute gold standard for treating superficial pigmentation and achieving rapid hair removal in lighter skin types.
The Physics of 755nm Alexandrite
At 755nm, the laser energy is preferentially absorbed by melanin over hemoglobin or water. Because the absorption is so aggressive, the pulse durations must be carefully managed to allow for thermal relaxation of the epidermis, typically requiring active epidermal cooling (cryogen or contact).
Primary Clinical Indications
- Hair Removal (Fine/Light Hair)
- Pigmented Lesions
- Sun Spots
Frequently Asked Questions
Is Alexandrite safe for dark skin?
No. The 755nm wavelength's high affinity for melanin means it cannot safely distinguish between epidermal melanin and follicular melanin in darker skin types (Fitzpatrick V-VI), leading to a high risk of burns or hyperpigmentation.
What is the best use for an Alexandrite laser?
It is most effective for hair removal on Fitzpatrick I-III skin types, particularly for fine or light hair that Nd:YAG cannot effectively target.