
Tissue Penetration
The tissue penetration depth of lasers depends largely on their wavelength.
Penetration depth is a measure of how deeply light can penetrate into a medium. Knowledge of the penetration depth of tissue at a particular wavelength is even more critical for laser phototherapy guidance. In the wavelength range of 600–1600 nm, scattering prevails over absorption, and light penetrates to a depth of 8–10 mm.