A far-infrared laser cavity designed to favor short-wavelength laser lines
was used to generate optically-pumped far-infrared laser radiation. New far
-infrared laser lines were discovered in hydrazine, heavy water, ammonia, a
nd several short-wavelength lines previously discovered in methanol were ob
served. Wavelength, frequency, and relative intensity measurements were per
formed on laser lines in the wavelength range 42.4 to 253.7 mu m. Each far-
infrared frequency measurement was obtained by mixing the far-infrared radi
ation with radiation from two reference CO2 lasers and from a microwave syn
thesizer in a metal-insulator-metal diode.
The pump laser was a high-Q Fabry Perot resonator oscillating on 275 gratin
g-selected laser lines lincluding regular, sequence, and hot band lines.