Spectral characteristics of a CO
2-N
2 laser was studied in the P branch region of 00°1-10°0 vibrational band by using a grating-type infrared spectrometer. A single spectral output, for instance, inP (20) and P (22) branches was observed to vary in time in nearly periodic fashion, while by a simultaneous measurement the total output power exhibited little variation. This phenomenon seems to be attributable to the thermal detuning of the laser resonator due to local heating by various causes in the CO
2-N
2 laser system. Also, the simultaneous oscillation of P (3) branch of 00°1-10°0 band of the N
2O molecule was observed during the CO
2 laser action, when a mixture of CO
2 and N
2 was discharged in the laser tube.
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