Which laser modality is typically less effective for darker skin types?

The alexandrite laser is typically less effective for darker skin types because it operates at a wavelength of around 755 nm, which is well absorbed by the pigment melanin in the skin. Darker skin has more melanin, which can absorb the laser light more effectively and lead to a higher risk of adverse effects, such as hyperpigmentation or burns. On the other hand, laser modalities like CO2 and erbium lasers work at different wavelengths and can be adjusted in energy levels to treat various skin types, making them safer for use on darker skin. The diode laser can also be used on darker skin types, but it is generally not as specific or effective on hair removal for people with darker skin when compared to the alexandrite laser. Recognizing the interaction between laser wavelength and skin pigmentation is crucial for selecting the appropriate laser modality for optimal safety and effectiveness.