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We report on an ultrastable molecular clock based on the interrogation of the3{\nu} rotational-vibrational combination band at 1563nm of carbon monoxide12C16O. The laser stabilization scheme is based on frequency modulation (FM)saturation spectroscopy in a high-finesse ultra-low expansion (ULE) glassoptical cavity using CO as the molecular reference for longterm stabilizationof the cavity resonance. The NICEOHMS FM modulation method is employed tomaintain a high signal-to-noise ratio and avoid conversion of laser frequencynoise into amplitude noise by the high finesse cavity. We report an AllanDeviation of 1.8x10-12 at 1 second that improves to 3.5x10-14 after 1000seconds of averaging.

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Ultrastable frequency reference at 1.56 {\mu}m using a CO molecular  overtone transition with the noise immune cavity-enhanced optical heterodyne  molecular spectroscopy method