What is the wavelength of a Ruby laser?

The wavelength of a Ruby laser is indeed 694 nanometers (nm). This specific wavelength falls within the red region of the visible spectrum. Ruby lasers utilize a synthetic ruby crystal as the gain medium, and this wavelength is essential for its application in various fields, including dermatology for laser hair removal.

When targeting hair follicles, the 694 nm wavelength is effective because it is selectively absorbed by the melanin in the hair. This absorption leads to the destruction of hair follicles while minimizing the damage to surrounding skin tissue. The efficacy of the Ruby laser at this specific wavelength makes it a valuable tool in laser hair removal treatments.

In contrast, the other wavelengths mentioned do not pertain to Ruby lasers: the 810 nm wavelength typically relates to diodes or other laser technologies, 10,600 nm is associated with CO2 lasers, which are effective for surgical applications rather than hair removal, and 2,940 nm corresponds to Er:YAG lasers, which are also not related to Ruby lasers. Thus, understanding the specific characteristics and applications of the Ruby laser at 694 nm is crucial for anyone studying laser technologies.