How does the depth of tissue penetration vary among different laser wavelengths?

The depth of tissue penetration is significantly influenced by the wavelength of the laser light used in therapeutic applications. Longer wavelengths, such as those in the near-infrared range, can penetrate more deeply into tissues because they experience less scattering as they pass through. Scattering occurs when light interacts with particles in the tissue, and shorter wavelengths, like blue or green light, tend to scatter more due to their smaller wavelength size. This increased scattering limits the effective penetration depth of shorter wavelengths.

By contrast, longer wavelengths are better suited for reaching deeper structures such as muscles or joints, making them particularly effective for various therapeutic and treatment applications. In this context, understanding the relationship between wavelength and tissue penetration is crucial for selecting the appropriate laser for specific treatments, ultimately enhancing the effectiveness of laser therapies.