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Anomalous gain in an isotopically mixed CO2 laser and application to absolute wavelength calibration

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3 Author(s)
Hewagama, T. ; Maryland Univ., College Park, MD, USA ; Oppenheim, U.P. ; Mumma, Michael J.

Measurements are reported on a grating-tuned CO2 laser, containing an isotopic mixture of 16O12C16 O, 16O12C18O, and 18O 12C18O. The P6 and R 14 lines of 16O12C16O were found to have anomalously high intensities. These anomalies are produced by the near coincidence of the transition frequencies in two distinct isotopes, permitting them to act as a single indistinguishable population. These two lines can be used to identify the rotational quantum numbers in the P and R branch spectra, thereby permitting absolute wavelength calibration to be achieved

Published in:

Quantum Electronics, IEEE Journal of  (Volume:27 ,  Issue: 3 )