Double-piece aspheric mirror ZOOM optical system

Abstract

The invention discloses a double-piece aspheric mirror ZOOM optical system which comprises an aspheric positive meniscus mirror, an aspheric biconvex mirror and a protective mirror. The system is novel in structural design, and a full aspheric mirror optical system is adopted. Based on the advantages of few aspheric mirrors and good aberration elimination effect, based on the zoom characteristic of a zoom lens to a focusing light spot and the focusing characteristic of a focusing compensation lens to a focusing point, based on aberration-eliminating diffraction limit image quality under a large numerical aperture and based on the relation between the coating damage threshold value and the mirror surface light spot size and reduction of the thermal lens effect, continuous adjustment of thefocusing light spot size, the divergence angle size and the focus position is achieved through position matching adjustment of the focusing compensation mirror and the zoom lens. The system is suitable for high-power optical fiber laser cutting application, and is particularly compatible with the cutting speed and quality of thin, medium and thick plates.

Description

technical field [0001] The invention relates to the technical field of high-power fiber laser cutting, in particular to a ZOOM optical system of double-piece aspheric mirrors. Background technique [0002] Laser processing technology covers various laser processing technologies such as laser cutting, welding, quenching, drilling, micromachining, etc., and utilizes the basic characteristics of the interaction between laser and matter. Due to the advantages of non-contact between laser beam and processing materials, processing speed and quality, laser processing technology is an irreplaceable high-tech. [0003] At present, laser cutting occupies the main position of the entire laser processing industry, among which fiber output laser cutting is the most important. Fiber output lasers include fiber lasers and semiconductor fiber-coupled lasers. Due to the flexibility of fibers and good coupling output to near-infrared beams, the market share of fiber output lasers has become ...

AI Technical Summary

Problems solved by technology

In foreign countries, the lens of the high-power continuous zoom beam expander system usually adopts an aspheric lens solution. The more common ones such as Precitec, HighYAG, etc. are 4-piece aspheric lens systems. There are also 3-piece aspheric lens solutions in China, and the overall price is very expensive. In addition to the greater thermal lens effect, since at least one lens surface in the middle of the optical path system has a very small spot size, the corresponding coating requirements are also very high, which increases the risk of use, and undoubtedly increases the difficulty of processing and coating.

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