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. 2018 Aug 20;9(9):4359–4371. doi: 10.1364/BOE.9.004359

Fig. 4.

Fig. 4

Schematic of the characterization setup. A custom-designed confocal microscope is coupled to a cooled-CCD spectrometer. The sample (DUT) is held on a precision xy stage equipped with piezoelectric actuators.