Shaping ring light-beam differiential confocal sensor with high space resolution capability
A technology with high spatial resolution and ring beam, which is applied in the direction of instruments, optical devices, and measuring devices, can solve the problems of three-dimensional fine structure micro-steps, micro-grooves, integrated circuit line width, and surface topography that cannot be accurately resolved. Achieve the effect of improving lateral resolution, improving signal-to-noise ratio, and reducing energy loss
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[0028] The structure and working principle of the high spatial resolution shaping annular beam differential confocal sensor of the present invention will be described in detail below in conjunction with the embodiments and accompanying drawings:
[0029] The structure of the high spatial resolution shaping annular beam differential confocal sensor in this embodiment is as follows figure 2 As shown, it includes: a laser 1, a beam expander 2 sequentially placed at the emitting end of the laser, a spatial filtering pinhole 3, a binary optical device 6 with circular phase distribution, and an adjustable diaphragm for adjusting the normalized radius of the incident ring light 7. Polarization beam splitter 13, a quarter wave plate 14 placed on the transmission light path of the polarization beam splitter, microscopic objective lens Z direction displacement tracking sensor 19, microscopic objective lens 15, microscopic objective lens Z direction micro displacement drive system 18, P...
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