An external cavity laser having a set atmosphere is disclosed. In an embodiment, the laser system includes a gain medium to emit light in response to an applied current, a wavelength selective reflector configured to resonate the light that is emitted from the gain medium, and a chamber containing a set atmosphere, the chamber being optically connected to the gain medium and the wavelength selective reflector such that the light that is emitted from the gain medium passes through the chamber.

 
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