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Optical system of annular light spot

An optical system and ring-shaped spot technology, which is applied in optics, optical components, laser welding equipment, etc., can solve the problems of low conversion efficiency and damage of ring-shaped beams, and achieve the effect of not easy to diffract, high energy conversion rate, and easy to realize

Pending Publication Date: 2020-06-26
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has a certain damage threshold, and due to energy loss and beam diffraction, the conversion efficiency of the ring beam is not high

Method used

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  • Optical system of annular light spot
  • Optical system of annular light spot
  • Optical system of annular light spot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The schematic diagram of the variable annular spot optical system provided by the first embodiment of the present invention is as follows figure 1 As shown, the whole system is divided into collimation unit, phase modulation unit and focusing unit. The laser beam is collimated into parallel light through the lens group of the collimation unit, and then enters from the plane end of the helical phase plate in the phase modulation unit, and emerges as a ring beam, whose topological charge is equal to that of the helical phase plate. Finally, the light spot with annular energy distribution is obtained by focusing through the lens group in the focusing unit.

[0047] like figure 2 Shown is a schematic structural diagram of the spiral phase plate in the variable annular spot optical system of the present invention. The spiral phase plate is an optical element in the prior art. In the prior art, the spiral phase plate is made into steps for the convenience of processing sha...

Embodiment 2

[0057] The schematic diagram of the variable annular spot system provided by the second embodiment of the present invention is as follows Figure 10 As shown, the laser beam passes through the collimation unit and the phase modulation unit, then passes through two scanning galvanometers, and finally passes through the focusing objective lens. mark.

[0058] The optical path of embodiment 2 and the energy distribution of the light field on the focusing plane are consistent with those of embodiment 1. Since the annular light spot produced by the spiral phase plate has high stability, the characteristics of annular distribution can still be maintained at the position away from the focal point. During the high-speed moving marking process of the galvanometer scanning, the circular energy output can be well maintained. Compared with the application of the embodiment 1 in the vertical space, the application of the embodiment 2 is mainly in the horizontal space.

[0059] In general,...

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Abstract

The invention belongs to the field of laser processing, and discloses an annular light spot optical system. The system comprises a collimation unit, a phase modulation unit and a focusing unit which are sequentially arranged along a light path. The phase modulation unit comprises at least one spiral phase plate positioned in the light path; a laser beam can be added with a spiral phase factor to realize phase modulation through a spiral phase plate in an optical path, so the energy distribution of the laser beam is changed into annular distribution. Furthermore, the spiral phase plates can bearranged on the rotating shaft, and the states in the light path and outside the light path are switched by rotating around the rotating shaft, so variable annular light spots can be realized by switching the spiral phase plates. By improving the components of the optical system and the matching action mode among the components, the annular light spot with concentrated energy distribution at the edge, larger diameter and longer focal depth can be obtained, the size of the light spot is further adjustable, and the optical system is suitable for various laser processing fields such as laser cutting and the like.

Description

technical field [0001] The invention belongs to the field of laser processing, and more specifically relates to an optical system of a ring-shaped spot. Background technique [0002] In the spot of ordinary Gaussian energy distribution, most of the energy is concentrated in the center, while the energy of the spot in the circular energy distribution is distributed around, and the energy in the center is low. The light spot of this kind of energy distribution has great advantages in the fields of laser cutting, marking, cladding and micro-processing. [0003] When using a Gaussian energy distribution spot for laser processing, ablation and other phenomena may occur if the center energy is too high, and due to insufficient energy at the edge, when performing deep processing such as laser cutting, the deeper the processing depth, the more insufficient energy at the edge , resulting in uneven cut sections. These problems can be effectively solved by using the spot with annular...

Claims

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Application Information

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IPC IPC(8): G02B27/09B23K26/06
CPCB23K26/06B23K26/0648G02B27/0927G02B27/0938
Inventor 秦应雄葛佳琪昌思怡张怀智唐霞辉
Owner HUAZHONG UNIV OF SCI & TECH
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