Focal-depth expanding method and device based on phase and polarization
An expansion method and polarized light technology, which is applied in the field of focusing methods and devices for expanding the depth of focus, can solve the problems of increasing system cost and poor effect, and achieve the effect of improving beam quality, uniform intensity, and saving system cost
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[0047] The present invention will be described in detail below with reference to the drawings and embodiments, but the present invention is not limited to this.
[0048] Such as figure 1 The device shown for achieving focal depth expansion includes: a light source 1, a polarization converter 2, a first beam splitter 3, a 0 / π circular phase plate 4, a second beam splitter 5, and a first mirror 6. The second reflecting mirror 7 and the apochromatic focusing lens 8, the expanded focal depth spot obtained after focusing appears near the working plane 9 of the apochromatic focusing lens 8.
[0049] Among them, the polarization converter 2 is a Radial-Azimuthal Polarization Converter from ARCoptix, Sweden, and the first mirror 6 and the second mirror 7 are metal film mirrors that can maintain the same polarization characteristics of the incident light and the reflected light.
[0050] The light source 1 emits a collimated and parallel working beam, which is converted into cylindrical polar...
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