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Ultrasensitive detection of methane, isotopic carbon dioxide, carbonmonoxide, formaldehyde, acetylene and ethylene is performed in the spectralrange 2.5 - 5 \mu m using intracavity spectroscopy in broadband opticalparametric oscillators (OPOs). The OPOs were operated near degeneracy andsynchronously pumped either by a mode-locked erbium (1560 nm) or thulium (2050nm) fiber laser. A large instantaneous bandwidth of up to 800 cm$^{-1}$ allowsfor simultaneous detection of several gases. We observe an effective pathlength enhancement due to coherent interaction inside the OPO cavity andachieve part-per-billion sensitivity levels. The measured spectral shapes arein good agreement with a model that takes into account group delay dispersionacross the broad OPO frequency band.

Intracavity trace molecular detection with a broadband mid-IR frequency comb source