TY - JOUR TI - Endoscopic diffraction phase microscopy AB - In this Letter, we present, to our knowledge, the first endoscopic diffraction phase microscopy (eDPM) system. This instrument consists of a gradient-index-lens-based endoscope probe followed by a DPM module, which enables single-shot phase imaging at a single-cell-level resolution. Using the phase information provided by eDPM, we show that the geometric aberrations associated with the endoscope can be reduced by digitally applying a spectral phase filter to the raw data. The filter function is a linear combination of polynomials with weighting optimized to improve resolution. We validate the principle of the proposed method using reflective semiconductor samples and blood cells. This research extends the current scope of quantitative phase imaging applications, and proves its potential for future in vivo studies. AU - Hu, Chenfei AU - Zhu, Shuaishuai AU - Gao, Liang AU - Popescu, Gabriel PB - OSA DA - 2018/07/15 PY - 2018 T2 - Optics Letters J2 - Opt. Lett. JF - Optics Letters JO - Opt. Lett. JA - Opt. Lett. VL - 43 IS - 14 SP - 3373 EP - 3376 KW - Phase measurement KW - Imaging systems KW - Microscopy KW - Aberration compensation KW - Adaptive optics KW - Diffraction limit KW - Imaging systems KW - Phase imaging KW - Spatial frequency KW - Tomography UR - http://ol.osa.org/abstract.cfm?URI=ol-43-14-3373 DO - 10.1364/OL.43.003373 ER -