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When gravitational waves pass through the nuclear star clusters of galacticlenses, they may be microlensed by the stars. Such microlensing can causepotentially observable beating patterns on the waveform due to waveformsuperposition and magnify the signal. On the one hand, the beating patterns andmagnification could lead to the first detection of a microlensed gravitationalwave. On the other hand, microlensing introduces a systematic error in stronglensing use-cases, such as localization and cosmography studies. We show thatdiffraction effects are important when we consider GWs in the LIGO frequencyband lensed by objects with masses $\lesssim 100 \, \rm M_\odot$. We also showthat the galaxy hosting the microlenses changes the lensing configurationqualitatively, so we cannot treat the microlenses as isolated point mass lenseswhen strong lensing is involved. We find that for stellar lenses with masses$\sim 1 \, \rm M_\odot$, diffraction effects significantly suppress themicrolensing magnification. Thus, our results suggest that gravitational waveslensed by typical galaxy or galaxy cluster lenses may offer a relatively cleanenvironment to study the lens system, free of contamination by stellar lenses.We discuss potential implications for the strong lensing science case. Morecomplicated microlensing configurations will require further study.

Stellar-mass microlensing of gravitational waves