MoTe2 monolayers and bilayers are unique within the family of van der Waals materials since they pave the way toward atomically thin infrared light-matter quantum interfaces, potentially reaching the important telecommunication windows. Here, we report emergent exciton polaritons based on MoTe2 monolayers and bilayers in a low-temperature open microcavity in a joint experiment-theory study [1]. Our experiments clearly evidence both the enhanced oscillator strength and enhanced luminescence of MoTe2 bilayers, signified by a 38% increase of the Rabi splitting and a strongly enhanced relaxation of polaritons to low-energy states. The latter is distinct from polaritons in MoTe2 monolayers, which feature a bottlenecklike relaxation inhibition. Both the polaritonic spin valley locking in monolayers and the spin-layer locking in bilayers are revealed via the Zeeman effect, which we map and control via the light-matter composition of our polaritonic resonances. We further explore a MoTe2-MoSe2 HBL where the moiré exciton-polaritons relax efficiently as in the MoTe2 homobilayer. In a resonant pump-power dependent measurement, we also found that the enhanced optical saturation due to moiré confinement that results in a larger polariton non-linearity as in a type-I heterostructure [2]. Our work paves the way for further research involving cavity- mediated phenomena in MoTe2-based van der Waals heterostructures, including the study of correlated phenomena, Telluride-based dipolaritons, and polariton lasers operated at telecommunication wavelengths.