Small signal gain in the CO-air-He laser

The small-signal single-pass gain for 24 individual CO laser lines has been measured for a flowing CO-air-He laser. The vibrational-rotational
P(J)_{\upsilon,\upsilon'}
lines considered were for rotational transitions from
J = 10
to 16 and upper vibrational levels from
\upsilon = 7
to 11. The maximum gain was observed for the
P(15)_{10,9}
laser line, with an average logarithmic energy gain of
2.633 \times 10^{-3}
cm
^-1
.