Laser hair removal continues to rise in popularity thanks to its long-lasting results, reduced maintenance, and high level of precision. Yet many people considering treatment quickly discover that not all lasers are the same. Two of the most widely used and effective technologies are the Alexandrite laser and the Nd:YAG laser, both of which are used in leading medical-grade systems such as those from Candela.
Understanding how these lasers work, and which skin types and hair colours they’re best suited to, can make a significant difference to your results. This guide breaks down everything you need to know about Alexandrite and Nd:YAG lasers, helping you make an informed decision before your consultation.
Why Laser Type Matters
Different laser wavelengths target the hair follicle in different ways. Choosing the right laser for your skin tone, hair colour, and treatment area ensures:
Better results
Safer treatments
Reduced risk of pigmentation issues
Greater comfort
Fewer sessions overall
Clinics that offer both Alexandrite and Nd:YAG systems, such as those operating with Candela GentleMax Pro, can tailor treatment to the individual, using the most suitable technology for every skin type.
The Basics: How Laser Hair Removal Works
Laser hair removal works by sending a concentrated beam of light to the pigment (melanin) in the hair follicle. This light converts to heat, damaging the follicle and reducing its ability to regrow.
For the treatment to work safely and effectively, the laser wavelength must be appropriate for the client’s skin tone and hair type. This is where Alexandrite and Nd:YAG lasers differ significantly.
Alexandrite Laser: The Gold Standard for Lighter Skin Types
What Is an Alexandrite Laser?
The Alexandrite laser operates at a 755 nm wavelength, making it highly effective for targeting pigmentation in the hair shaft. Its shorter wavelength means it is absorbed efficiently by melanin, allowing the laser to deliver powerful energy directly into the follicle.
Ideal For:
Lighter skin tones (Fitzpatrick I–III)
Dark or medium hair
Fine to coarse hair
Individuals seeking fast treatment sessions
Why It Works So Well on Lighter Skin
Because lighter skin contains less melanin in the epidermis, the laser can focus its energy on the hair follicle without competing with skin pigment. This leads to:
Faster results
Fewer sessions
High levels of precision
Speed and Efficiency
The Alexandrite laser has one of the largest spot sizes among professional systems, especially when delivered through devices like the Candela GentleLase or GentleMax Pro. This allows practitioners to move quickly across the skin, making it ideal for treating:
Legs
Arms
Back
Chest
Underarms
Limitations of Alexandrite Lasers
While extremely effective on lighter skin, the powerful absorption by melanin makes it unsuitable for darker skin tones. On darker skin, the laser risks interacting with epidermal pigment, which can increase the chance of:
Burns
Hyperpigmentation
Hypopigmentation
This is where the Nd:YAG laser becomes essential.
Nd:YAG Laser: The Safest Option for Darker Skin Tones
What Is an Nd:YAG Laser?
The Nd:YAG laser operates at a 1064 nm wavelength, which is far less absorbed by melanin. This longer wavelength penetrates deeper into the skin, bypassing most epidermal pigment and making it highly suitable for darker skin tones.
Ideal For:
Medium to dark skin tones (Fitzpatrick IV–VI)
Thicker, coarser hair
Treating areas prone to ingrown hairs
People with sensitive skin
Why Nd:YAG Is Best for Darker Skin
Darker skin contains more melanin at the surface. A laser that strongly targets melanin—like Alexandrite—can cause overheating of the epidermis. However, the Nd:YAG’s deep-penetrating wavelength minimises this risk.
Benefits include:
Lower risk of pigmentation changes
Greater safety on richly pigmented skin
Effective treatment of coarse hair
Deeper Penetration, Greater Precision
Although Nd:YAG lasers target melanin less efficiently than Alexandrite systems, their deeper penetration makes them excellent for:
Men with thick, coarse hair
Body areas where hair density is high
Treating ingrown hairs caused by shaving
This makes Nd:YAG an excellent choice for beard lines, necks, and intimate areas.
Limitations of Nd:YAG Lasers
Due to the lower melanin absorption, more sessions may be required for full results compared to Alexandrite treatments on light skin. The sensation may feel slightly stronger because of the laser’s depth, though Candela’s cooling technology greatly improves comfort.
Candela Technology: Combining the Best of Both Worlds
Leading clinics use devices such as the Candela GentleMax Pro, which house both Alexandrite and Nd:YAG lasers in one system. This offers key advantages:
1. Complete Skin Type Coverage
From very fair to very dark skin, Candela devices allow practitioners to choose the ideal wavelength for each client.
2. Optimal Flexibility
Some clients may require mixed treatments, for example:
Alexandrite for the legs
Nd:YAG for bikini or beard areas
Alexandrite on the arms but Nd:YAG on more sensitive or tanned areas
This custom approach results in safer treatments and more consistent results.
3. Enhanced Comfort with Dynamic Cooling Device
Candela lasers use a unique Dynamic Cooling Device (DCD) that releases a burst of cryogen milliseconds before each laser pulse. This protects the skin and makes the treatment significantly more comfortable compared to older systems.
4. Clinical-Grade Power
Because Candela lasers are medical-grade, they provide:
Faster sessions
Better hair reduction
Greater reliability
Proven safety
Stronger long-term outcomes
Which Laser Is Best for Your Skin Type?
Fitzpatrick Skin Type I–III (light to medium skin)
Best laser: Alexandrite
These skin types respond exceptionally well to Alexandrite lasers, offering fast, efficient results with fewer sessions.
Fitzpatrick Skin Type IV–VI (medium-dark to dark skin)
Best laser: Nd:YAG
Safest and most effective due to deeper penetration and lower melanin absorption at the surface.
Hair Colour Considerations
Both Alexandrite and Nd:YAG lasers work best on:
Dark brown hair
Black hair
Lasers are less effective on:
Blonde
Grey
Red hair
This is because these shades contain less melanin. In such cases, alternative solutions may be recommended, but only after professional assessment.
Which Laser Hurts More?
Pain levels can vary, but in general:
Alexandrite may feel slightly sharper due to its melanin targeting.
Nd:YAG may feel deeper and warmer because it penetrates further.
Candela’s cooling technology significantly reduces discomfort for both.
How to Choose the Right Clinic
When selecting a clinic for laser hair removal, ensure they offer:
Both Alexandrite and Nd:YAG lasers
Candela medical-grade devices
Highly trained practitioners
Patch testing
A personalised treatment plan
Transparent pricing and consistent follow-ups
This ensures you receive the safest treatment and the best results based on your unique skin and hair profile.
Conclusion
Understanding the difference between Alexandrite and Nd:YAG lasers can help you choose the safest and most effective route to long-lasting hair reduction. Alexandrite is the top choice for lighter skin tones, delivering fast, powerful results. Nd:YAG provides exceptional safety and performance on darker skin tones thanks to its deep-penetrating wavelength.
Clinics using Candela laser technology offer both options in one system, making personalised treatment accessible and ensuring the highest levels of safety and effectiveness for every client.
Whether you’re looking to reduce unwanted body hair, tidy beard lines, or simplify your grooming routine, the right laser can make all the difference.
