Abstract
To reduce the linewidth mismatch between the emission lines of a CO 2 -TEA laser and the absorption lines of a low-pressure FIR gain medium a tiltable Ge etalon has been introduced into the TEA resonator. The resulting spectral compression and tunability increase the energy conversion efficiency in a TEA laser pumped CH 3 OH laser by as much as a factor of 37 and has led to the observation of 14 new FIR laser lines.
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