Precision spectroscopy of molecules in the mid-infrared region where the fundamental bands are located is of great interest in fundamental physics. In order to achieve a high accuracy, one can measure the spectroscopy in the Lamb-dip zone with sub-Doppler resolution, where further reduction of the laser linewidth and transit-time broadening is perspective. Here we report a new method to reduce the mid-infrared laser linewidth of an optical parametric oscillator (OPO) by locking the pump and idle lights to a frequency comb, resulting in a narrow linewidth and good long-term stability of the signal laser. In this way, we demonstrate that the measured Lamb dip linewidth can be as narrow as tens of kHz and the transition frequency can be determined to an accuracy of a few kHz.
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