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. 2022 Feb 15;13(3):1497–1505. doi: 10.1364/BOE.447558

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Fig. 1. — A schematic illustration for the handheld confocal microscope catheter using Lissajous scanning MEMS mirror. The module consists of collimation and reflection optics, MEMS mirror, and a GRIN lens. The MEMS mirror facilitates HDHF Lissajous scanning by selecting the scanning frequencies near the resonant frequency within the resonant bandwidth, which are indicated by the colored region. The inner mirror has a low Q-factor to provide a board resonant frequency band for flexible frequency selection. The selection of scanning frequencies with high GCD and high total lobe number realizes HDHF Lissajous scanning with over 30 Hz frame rate and over 95.4% fill factor at 256 × 256 pixels image.