Molecular cavity optomechanical systems have recently emerged as a promising platform for enhancing infrared detection sensitivity, owing to their ability to up-convert low-frequency infrared (IR) photons to visible frequency range. Generally, under red-detuned pumping in such systems, the maximum conversion efficiency of the IR signal can only approach 1. To achieve higher conversion efficiency, we propose a scheme that incorporates gain into the infrared cavity of a molecular cavity optomechanical system comprising two cavities and an ensemble of $N$ molecules. The up-conversion process, which relies on IR absorption and Raman scattering associated with specific vibrational modes, is significantly amplified by the incorporation of gain under the red-detuned conditions. Moreover, our analysis demonstrates that the added noise is maintained near 0.5.

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• Molecular spectra
• Optical parametric oscillators & amplifiers
• Optical sources & detectors
• Optomechanics
• Vibrational states
• Molecules
• Optical spectroscopy