How different Wavelengths work
History of the laser Machine
This chart shows colors of the visible light spectrum, and the associated wavelengths in nanometers. Ranges are traditionally given as: ultraviolet light, 100-400 nm; visible light, 400-750 nm; and infrared, 750 nm-1 mm.
This chart shows common types of lasers, and the major wavelengths associated with them.
Lexel model numbers are given for applicable Gas-Ion and deep UV Gas-Ion Second Harmonic Generation (SHG) lasers.
Wave Lengths in Laser Hair Removal
Laser hair removal is based on the principles of selective photothermolysis: a combination of the appropriate laser wavelength, pulse duration, and fluence. Wavelengths between approximately 700 and 1000 nanometers (nm) are selectively absorbed by melanin; the competing chromophores (oxyhemoglobin and water) absorb less energy at these wavelengths. The picture below shows the absorption of different chromophores in the skin. Therefore, any light source that operates between 700 and 1000 nm is appropriate for targeting melanin in the hair shaft.
The absorption of various chromophores as a function of wavelength. Ruby lasers operate at 694 nm, alexandrite lasers at 755 nm, diode lasers at 800 nm and Nd:YAG lasers at 1064 nm.
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