Abstract
Frequency calibration of a 1.3-microm diode laser spectrometer was carried out with a simultaneously recording spectrum of the iodine molecule in the visible region using internal second harmonics from the diode laser itself. An absolute accuracy of 0.002 cm(-1) was achieved with the frequency standard spectrum of the iodine molecule in the visible region and frequency markers from an étalon. Several atomic and molecular transitions in the near-infrared region were remeasured using this new frequency reference.
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