Technology
Diode or alexandrite laser: what to choose for a salon
In short
Diode or alexandrite laser: which is better for a salon?
There is no universally best option. Alexandrite at 755 nm is more often chosen for fine, light hair, and the diode at 808 nm for a mixed client flow with different skin types. Everything comes down to the wavelength. At 755 nm, melanin absorbs energy more strongly, so alexandrite suits fine and light but pigmented hair. The same physics calls for caution on dark and tanned skin. At 808 nm, absorption is lower and penetration deeper, so the diode is more universal across skin types. For dark skin, 1064 nm is used. According to pooled study data, alexandrite and diode give a similar short-term result: about 50% hair reduction in the first six months after a course of treatments. Grey, white and red hair responds poorly to any light-based hair removal. The speed and comfort of a treatment depend less on the wavelength than on the spot size, the repetition rate and the cooling. If the flow is mixed, look at laser platforms with several wavelengths. Below is a comparison by skin type, hair and cost of ownership.
How does a diode laser physically differ from an alexandrite laser?
The difference between the technologies is first of all the wavelength. Two properties depend on it: melanin absorption and depth of penetration. They change together. For details, see the article on 755, 808 and 1064 nm.
| Wavelength | Melanin absorption | Depth of penetration | Where it is strong |
|---|---|---|---|
| 755 nm (alexandrite) | High | Less | Fine and light but pigmented hair; light skin types |
| 808 nm (diode) | Medium | Medium | Universal range of skin types |
| 1064 nm | Low | Greater | Dark skin types, deep follicle |
High melanin absorption is both a strength on light hair and a reason for caution on dark skin. One property, two sides.
How to choose the technology for your client flow?
- A lot of fine and light hair. 755 nm is absorbed more strongly by melanin, so it is chosen more often for this type of hair. Grey, white and red hair responds poorly to any light-based hair removal.
- Mixed skin types, including IV–VI. It matters more whether the device has 1064 nm than one ‘correct’ wavelength.
- Clients who tan all year round. 1064 nm heats the melanin in the skin less. But fresh tan is a reason to postpone the treatment on any device. The specialist makes the decision.
The difference in results is smaller than the debate about it. In the Cochrane review of 2006, alexandrite and diode show about 50% hair reduction in the first six months after a course of treatments. A network meta-analysis of 2023 found no significant difference between laser types.
What affects the speed and pain of a treatment?
Speed and pain depend not only on the wavelength. Spot size, frequency, cooling and pulse shape have a stronger effect on them.
- Spot size and pulse repetition rate determine the time needed to treat an area.
- Skin cooling system — comfort and the acceptable settings both depend on it.
- The shape of energy delivery: one powerful pulse or several pulses with pauses.
For more on the third point, see the breakdown of three-pulse energy delivery.
Which costs more to maintain: alexandrite or diode?
In an alexandrite laser, the crystal is pumped with a lamp. Pump lamps are replaced according to the service schedule. Some systems consume cryogen to cool the skin.
A diode laser has no lamps. Its main lifetime component is the diode assembly, with a rated lifetime in pulses. Compare not the type of laser, but the written list of what is replaced and when.
Count three years of ownership.
Where IPLASER fits in
The iPRO MINI hair removal handpieces are not a diode or alexandrite laser, but IPLASER technology. It is IPL with narrow-band filtering and three pulses per flash, the way Innovatione devices have worked since 2013. For how the technology works and how it differs from lasers, see the IPLASER page.
Who this breakdown is not for
- If you are looking for a treatment for yourself. The article is written for those who buy equipment.
- If you need to choose between specific models. This is about classes of technology, not brands.
- If you have a narrow specialisation. For example, if you only work with dark skin types. In that case, the logic of choice is different.
- If only price decides. Then the comparison of technologies is secondary.
What to check before buying
- Gather statistics by skin type. Based on actual records for the past three months.
- Assess the share of fine and light hair. This is the main argument for 755 nm.
- Ask for the full range of wavelengths. Not ‘diode’, but specific figures.
- Clarify the cooling. Type, presence of a temperature sensor, behaviour under client flow.
- Request the three-year cost of ownership. Service and consumable parts.
Questions and answers
Is a diode or an alexandrite laser better?
There is no universally best option. Alexandrite at 755 nm is more often chosen for fine and light but pigmented hair. The diode at 808 nm is more universal across skin types. The choice depends on the mix of your client flow.
What is the difference between 755 nm and 808 nm?
At 755 nm, melanin absorbs energy more strongly, and penetration is shallower. At 808 nm, absorption is lower and penetration deeper, which makes the diode more universal across skin types.
Which wavelength is used for dark skin?
For dark skin types, 1064 nm is used: melanin absorption is lower there, and penetration is deeper.
What matters more for treatment speed?
Spot size and pulse repetition rate, not the wavelength itself.
Is iPRO MINI 755 a diode laser?
No. iPRO MINI works on IPLASER technology: it is IPL with narrow-band filtering and three pulses per flash.
What costs more to maintain?
It depends on the design. In alexandrite lasers, the pump lamps are replaced according to the service schedule, and some systems consume cryogen. In a diode laser, the main lifetime component is the diode assembly. Compare the written list of replacements over three years.
Does laser hair removal work on grey and red hair?
Poorly, on any light-based device. Grey, white, red and very light hair contains little dark pigment that absorbs light. For such hair, other hair removal methods are usually recommended.
This material is for reference only. It describes the properties of the technologies, not the result of a specific treatment. The specialist chooses the parameters. Checked on 14 October 2026.
