Alexandrite laser: how it works, suitability and limitations

What 755 nanometres means

The alexandrite laser uses light at a wavelength of 755 nanometres. Pigment in the hair absorbs energy; the resulting heat can affect the follicle in a way that reduces growth. Skin also contains pigment, so settings and cooling must be appropriate for the area being treated.

For the GentleMax Pro, Candela assigns 755 nm to skin types I–III and 1064 nm to skin types IV–VI. This is manufacturer guidance, not blanket approval for an individual. Naturally dark skin and a recent suntan need to be assessed differently.

Comparison with other methods

Alexandrite and diode lasers are different laser technologies; IPL uses intense pulsed light with a filtered spectrum. The term ‘gold standard’ does not guarantee that a method is better for every skin and hair type. Claims about fixed penetration depths or consistently fewer sessions are of little help without reference to the specific device and person.

• Ask about the exact device and experience with your skin type.
• Ask what results and risks to expect for your treatment area.
• Very light, red, grey or white hair is often unsuitable for pigment-based laser treatment.

Results and treatment planning

Several sessions are needed because hair growth and responses vary over time. We cannot promise a fixed reduction such as 80 or 90 per cent without individual progress data. Hair may grow back after a course of treatment, and maintenance sessions may be needed.

The GentleMax Pro’s DCD cooling helps protect the skin surface. It does not rule out redness, burns or changes in pigmentation. During your consultation, we discuss suitability, alternatives, preparation and likely costs.