Abstract
Four transitions from a cw CO2 laser were used to pump pure NH3 and obtain cw lasing in the 12-μm region. The pump frequencies were offset by as much as 1.35 GHz from the absorbing transitions in NH3, and a Raman process was generally responsible for the 12-μm gain. At high pump intensity several watts of 12-μm output were obtained, while threshold operation was achieved with less than 1 W of pump power.
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