Ruby laser, also known as ruby rod laser, is a type of laser that produces a red light with a wavelength of 694.3nm. It is predominantly used in industrial applications such as cutting and welding. Synonyms for ruby laser include red laser, ruby rod, ruby laser oscillator, and ruby crystal laser. Some companies may use specific brand names to describe their version of a ruby laser, such as Coherent's Pure Pulse system. While the terminology may vary, the underlying technology remains the same. Ruby lasers are known for their ability to deliver high-energy pulses, making them a valuable tool in manufacturing and scientific research.