The invention relates to an analytical description method of annular structured light, and belongs to the technical field of optics The method comprises the steps: enabling laser to pass through an axicon-lens light beam transformation system to obtain annular light; obtaining geometric optical parameters of the axicon-lens light beam transformation system; and finally obtaining the intensity distribution of the annular light According to the method, the intensity distribution of the annular light on a rear focal plane of a lens in the axicon-lens combination can be directly calculated, anda numerical integration method is not needed According to the required annular light intensity distribution requirement, the geometric optical parameters of the axicon, the lens and the combination of the axicon and the lens are adjusted, and then light path design can be completed

Analytical description method of annular structured light

This optical device (1a) is provided with a first lens group (21), an axicon lens (10), and a second lens group (22). A laser beam is incident on the first lens group (21). The laser beam that passes through the first lens group (21) is incident on the axicon lens (10). The laser beam that passes through the axicon lens (10) is incident on the second lens group (22). The first lens group (21) forms a first Bessel beam (A) and a first ring beam (B), and forms a focal surface (f) at which the ring width of the first ring beam (B) is the smallest. The second lens group (22) forms a second ring beam (C) the ring width of which is substantially constant along an optical axis, and forms a second Bessel beam (D).

Fujimoto Shingo

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