<P> Metal - vapor lasers are gas lasers that typically generate ultraviolet wavelengths . Helium - silver (HeAg) 224 nm neon - copper (NeCu) 248 nm and helium - cadmium (HeCd) 325 nm are three examples . These lasers have particularly narrow oscillation linewidths of less than 3 GHz (0.5 picometers), making them candidates for use in fluorescence suppressed Raman spectroscopy . </P> <P> The Copper vapor laser, with two spectral lines of green (510.6 nm) and yellow (578.2 nm), is the most powerful laser with the highest efficiency in the visible spectrum . </P> <Ul> <Li> High volume of active material </Li> <Li> Active material is relatively inexpensive </Li> <Li> Almost impossible to damage the active material </Li> <Li> Heat can be removed quickly from the cavity </Li> </Ul> <Li> High volume of active material </Li>

Advantages of gas laser over solid state laser