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Penetration depth is a measure of how deep light or any electromagnetic radiation can penetrate into a material. It is defined as the depth at which the intensity of the radiation inside the material falls to 1/e (about 37%) of its original value at (or more properly, just beneath) the surface.

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Jump to Results—effect of beam width on penetration depth - A key contributor to the penetration depth is to the mid-dermal and deeper layers of skin ‎Introduction · ‎Materials and method · ‎Results—effect of wavelength · ‎Discussion.

Figure illustrates results of the reconstruction of the skin penetration depth (le ≈ ld), based on the spectral dependences of the absorption and reduced.

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