We show that quantitative phase imaging (QPI) is a facile method for in-situ shape monitoring during multi-photon laser printing. In-situ QPI requires minimum hardware modifications of a commercial 3D laser printer and takes only a few seconds for data acquisition. We validate the approach by comparing in-situ phase reconstructions with independent ex-situ height measurements. Example applications are polymer refractive-index retrieval, shrinkage measurements, and shape reconstructions of printed microoptical devices such as microlenses and diffractive optical elements. Our research paves the way for routine monitoring of 2.5D printed structures and on-the-fly shape optimization of printed microoptics.
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