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.
© 1986 Optical Society of America
Original Manuscript: December 16, 1985
Manuscript Accepted: February 10, 1986
Published: May 1, 1986
D. F. Kroeker, C. Rolland, J. Reid, and B. K. Garside, "Operation of continuous-wave 12-μm Raman lasers in NH3 with pump offsets as large as 1.35 GHz," Opt. Lett. 11, 300-302 (1986)