The Gold Vapor laser is very similar to The Copper Vapor laser both in structure, and principles of operation. Sometimes, the same system (laser tube and power supply) is used for both lasers. The only change is to replace the solid Copper by a wire of pure Gold.

The wavelength of Gold lasers is Red: 628 [nm].

The main applications of Gold vapor laser are in the experimental cancer treatment of Photo-Dynamic Therapy (PDT), (see section 9.2.2).