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(a) Design of calibration device, with three locations marked. (b) Fluorescence intensity as measured by multiphoton microscopy at locations marked in (a). (c) Images from multiphoton imaging with fabrication at four constant average laser powers, varying linearly from 10.5 mW (top left, peak intensity of 1.34 TW/cm2) to 12.0 mW (bottom right, peak intensity of 1.53 TW/cm2).
