Lasers where optical Amplification occurs in a plasma containing excited dimers with an anti-binding electronic ground state.
An excimer Laser is a powerful kind of laser which is nearly always operated in the Ultraviolet spectral region and generates nanosecond pulses. The excimer Gain medium is a gas mixture, typically containing a noble gas and a halogen, apart from helium and/or neon as Buffer gas. An excimer gain medium is pumped with short current Pulses in a high-voltage electric discharge (or sometimes with an Electron beam), which create so-called excimers molecules which represent a bound state of their constituents only in the excited electronic state, but not in the electronic ground state.
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