**Working principle**:
Laser hair removal uses a laser beam of a specific wavelength to penetrate the surface of the skin and reach the melanin in the hair follicles. The laser energy is absorbed by the melanin in the hair follicles and converted into heat. This heat can destroy the structure of the hair follicles, causing the hair follicles to lose their ability to regenerate, thereby achieving permanent or semi-permanent hair removal. The wavelength, pulse duration and energy density of the laser are usually adjusted according to the patient's skin type, hair color and thickness to ensure the best effect and minimal discomfort.
Advantages of laser hair removal
1. **High precision**: The laser can accurately target the hair follicles without affecting the surrounding skin tissue. It is especially suitable for sensitive areas such as the face, underarms, and bikini line.
2. **Long-lasting effect**: Compared with traditional hair removal methods (such as shaving, plucking, and waxing), laser hair removal has a longer-lasting effect. After several treatments, many people can achieve long-term hair reduction or even permanent hair removal.
3. **Fast speed**: Laser hair removal irradiates a large area each time, and can treat a larger area in a short time. For example, the hair removal process for the underarms or upper lip only takes a few minutes.
4. **Fewer side effects**: Modern laser hair removal devices often come with a cooling system that can reduce the discomfort that may occur during treatment, while protecting the skin and reducing the risk of burns or pigmentation.
5. **Widely applicable**: Laser hair removal is suitable for all skin colors and hair types. Although the results may vary depending on the color combination of skin and hair, by choosing the right laser type and settings, most people can achieve the desired hair removal results.
6. **Reduce hair regrowth**: Even if hair grows again, it will usually become thinner, lighter, and sparser.
**Difference between 940nm laser and other three wavelengths**:
The commonly used wavelengths for laser hair removal are 755nm, 808nm, 940nm and 1064nm. The difference between them lies in their suitability for different hair types and skin tones.
1. **755nm (Alexandrite laser)**: Mainly suitable for light skin and fine hair. It has a shallow penetration depth and is more suitable for treating superficial hair follicles.
2. **808nm (semiconductor laser/diode laser)**: This is a widely used wavelength that is suitable for a variety of skin tones and hair types, especially medium-colored hair. It can penetrate deep into the hair follicles while causing less thermal damage to the skin.
3. **940nm**: This wavelength can penetrate the skin better than other wavelengths, reducing thermal damage to the epidermis and is suitable for people with darker skin tones. It is more effective when treating deeper hair follicles and can reduce the risk of pigmentation.
4. **1064nm (Nd:YAG laser)**: Suitable for people with darker skin tones, it can penetrate deeper into the skin. Due to its deep penetration depth, it is suitable for treating deeper hair follicles, but usually requires higher energy to achieve hair removal results.
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