Written Laser Hair Removal Practice Exam

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What is the wavelength of a Ruby laser?

755nm
800nm
694nm
1064nm

The correct answer is: 694nm

The Ruby laser operates at a wavelength of 694nm. This specific wavelength is within the red spectrum of visible light and is produced by the stimulation of a ruby crystal. The characteristics of the 694nm wavelength make it particularly effective for certain types of hair removal, as it targets the melanin in hair follicles, allowing for successful hair reduction. In the context of laser hair removal, it's important to select a laser wavelength that is well absorbed by the hair pigment, and the Ruby laser's wavelength aligns well with this requirement. Other mentioned wavelengths, such as 755nm, 800nm, and 1064nm, belong to different types of lasers (like Alexandrite and Nd:YAG lasers) and have their own specific applications and efficacy regarding hair removal. However, none of these lasers operate at the specific wavelength of 694nm as produced by the Ruby laser.