Alexandrite vs Nd:YAG Laser Hair Removal
Two useful wavelengths with different strengths — and a choice that should follow skin and hair, not a marketing slogan.
755 nm Alexandrite is absorbed strongly by melanin and can be highly effective where dark hair contrasts with lighter, untanned skin. 1064 nm Nd:YAG is less strongly absorbed at the surface and penetrates more deeply, so it is often favoured for darker phototypes. Neither is universally “best”.
Strong melanin targeting where contrast is favourable
Alexandrite’s shorter wavelength is strongly absorbed by melanin. In an appropriate patient this can make follicular heating efficient, especially for coarse, dark hair against lighter, untanned skin. The same strong melanin interaction reduces the margin for epidermal heating when skin pigment is higher or when a tan is present.
A split-body blinded study in Fitzpatrick II–III axillae found its tested single 755 nm protocol produced greater reduction than the tested dual-wavelength protocol at 12 months. That is useful device-specific evidence, not proof that 755 nm should be used for every person or body site.
A wider surface-skin safety margin
Nd:YAG at 1064 nm is absorbed less by epidermal melanin and reaches more deeply. In a randomized trial of Fitzpatrick IV–VI skin, long-pulsed Nd:YAG outperformed the IPL system tested for axillary reduction at six-month follow-up. Participants reported more pain and inflammation on the laser side, though the effects recorded were temporary.
This makes Nd:YAG important for darker skin, not infallible. Conservative parameters, effective cooling, honest tan history and operator judgement still determine whether treatment should proceed.
Sometimes the useful answer is not either/or
Some systems can deliver both wavelengths or a blend. A randomized study of blended 755/1064 nm energy found a high-Nd:YAG mixture useful in selected darker or tanned skin with lighter hair, balancing hair reduction, epidermal effects and discomfort. A later prospective multicentre study also reported maintained safety and high satisfaction with simultaneous emission, though investigators disclosed manufacturer relationships.
Blending is a tool, not a guarantee of superiority. The ideal ratio and settings remain patient-, device- and area-specific.
What actually changes the choice
- Skin phototype and current tan: higher epidermal pigment generally favours a longer wavelength and more conservative settings.
- Hair colour and calibre: dark, coarse hair is the most useful target; very light hair may not respond whichever wavelength is used.
- Body area: follicle depth and growth cycle differ.
- Previous response: shedding, regrowth, side effects and discomfort inform later settings.
- Device and operator: wavelength is only one part of the treatment system.
The Motus AY at Rejuvena provides both 755 nm Alexandrite and 1064 nm Nd:YAG. Consultation and patch testing determine how that capability is used.
Reviewed by Dr Nick
Dr Nick, Medical Director — GMC 6072251. This guide was clinically reviewed on 25 August 2026. It explains general evidence and cannot replace an assessment of your skin, hair, medicines and medical history.
Research used for this guide
- Single 755 nm versus dual 755/1064 nm hair removal — split-body blinded trial in Fitzpatrick II–III axillae
- Long-pulsed Nd:YAG versus IPL in dark skin — randomized controlled trial in Fitzpatrick IV–VI skin
- Hair removal with blended 755/1064 nm energy — randomized study comparing blend ratios and single wavelengths
- Simultaneous Nd:YAG and Alexandrite emission for hair reduction — prospective multicentre study with declared conflicts of interest
Study protocols, devices and patient groups differ. Percentages from one trial should not be read as a personal result guarantee.