小中大【回复】
confocal hole and the slit width were fixed at 200 μm, 632.8 nm He–Ne laser, 10X objective lens (N.A.数值孔径 = 0.25 WD工作距离 = 10.6 mm)
spatial resolution 3um, The power at the sample was ~ 6.8 mW, 光栅600 groove/mm holographic grating, 曝光时间1s 扫描次数3次