Light of different wavelengths has different penetration depths and absorption profiles in skin tissue/melanin.
The clinical efficiency of yellow light will naturally be compared with green solid-state laser. The following clarifies the difference.
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Green light vs yellow light
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Due to its shorter wavelength, green light loses more energy to melanin on its way to the blood cells than yellow light (left panel) does, i.e.
green light does not reach as deep into the dermis. In other words, more yellow light makes it past the epidermis and penetrates deeper
into the dermis than green light (right panel) does.
What happens in the blood vessel?
In the blood vessel the energy of light particles heats up the blood cells. The heat is eventually transferred to the wall of the blood vessel
which denatures at 55-70°C. Denatured blood vessels and other waste products are dissolved and removed by the body's own 'waste management' systems
and the vascular lesion disappears.
