A simple but efficient method for stabilizing tunable diode lasers (TDL) has been developed to improve the sensitivity of spectroscopy of low density gas. The same spectral line itself to be measured is broadened by pressure and is used as a frequency discriminator in the loop of stabilization. The frequency tuning range is wide enough to obtain a correct profile of the spectral line. A demonstrative observation has been done on the v 2 asQ(7,6) transition of NH 3 (929 cm -1 ). With the TDL stabilization, the fluctuation of the TDL frequency is reduced to less than 1 MHz in several hours.
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Okude et al. (1987) studied this question.
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