  Frequency up-conversion, enabled by molecular optomechanical coupling, has
recently emerged as a promising approach for converting infrared signals into
the visible range through quantum coherent conversion of signals. However,
detecting these converted signals poses a significant challenge due to their
inherently weak signal intensity. In this work, we propose an amplification
mechanism capable of enhancing the signal intensity by a factor of 1000 or more
for the frequency up-converted infrared signal in a molecular optomechanical
system. The mechanism takes advantage of the strong coupling enhancement with
molecular collective mode and Stokes sideband pump. This work demonstrates a
feasible approach for up-converting infrared signals to the visible range.
