中国物理B ›› 2007, Vol. 16 ›› Issue (6): 1624-1631.doi: 10.1088/1009-1963/16/6/023
冯政德1, 赵维谦2, 邱丽荣2
Zhao Wei-Qian(赵维谦)a)† , Feng Zheng-De(冯政德)b), and Qiu Li-Rong(邱丽荣)a)
摘要: A shaped annular beam tri-heterodyne confocal microscope has been proposed to improve the anti-environmental interference capability and the resolution of a confocal microscope. It simultaneously detects far-, on-, and near-focus signals with given phase differences by dividing the measured light path of the confocal microscope into three sub-paths (signals). Pair-wise real-time heterodyne subtraction of the three signals is used to improve the anti-environmental interference capability, axial resolution, and linearity; and a shaped annular beam super-resolution technique is used to improve lateral resolution. Theoretical analyses and preliminary experiments indicate that an axial resolution of about 1 nm can be achieved with a shaped annular beam tri-heterodyne confocal microscope and its lateral resolution can be better than 0.2 $\mu $m for $\lambda =632.8$~nm, the numerical aperture of the lens of the microscope is NA $=0.85$, and the normalized radius $\varepsilon =0.5$.
中图分类号: (Optical communication systems, multiplexers, and demultiplexers?)