Three-dimensional dammann array generator
A Damman array and generator technology, applied in the field of three-dimensional Damman array generators, can solve the problems of three-dimensional light spot effect damage, three-dimensional grating period number and pixel number cannot reach enough, and high numerical aperture focusing cannot be applied.
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[0027] The present invention will be further described below in conjunction with embodiment and accompanying drawing, but should not limit protection scope of the present invention with this,
[0028] 1. Theoretical design
[0029] 1. The physical model of the three-dimensional focusing light field of the high numerical aperture objective lens
[0030] For example figure 1 The high numerical aperture objective shown focuses the light field, establishing a cylindrical coordinate system. Among them, the direction of the optical axis is along the z-axis direction, and the transverse polar axis of the cylindrical coordinates is in figure 1 In the plane shown, the coordinate origin is at the geometric focal point 501 of the aberration-absorbing focusing objective lens 500 . Under the Debye approximation, the three-dimensional focusing field of the aberration-absorbing focusing objective lens 500 near the focal point can be expressed as
[0031] E ...
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