What is the wavelength of the K-series aiming beam?

The correct wavelength of the K-series aiming beam is 660 nm. This wavelength is in the red spectrum of visible light and is specifically chosen for its ability to provide a clear visual cue for practitioners when targeting the treatment area during laser therapy. The 660 nm wavelength is easily detectable by the human eye, making it beneficial for alignment and ensuring accuracy during the application of the laser. This precision is crucial in therapeutic applications, where targeting specific tissues can significantly impact treatment efficacy.

In contrast, other options represent wavelengths that may be used in different contexts or types of laser applications but do not pertain to the K-series aiming beam specifically.