The appearance of square core fiber -- improving the beam power density, solving the problem of pattern matching and spot homogenization

From May 16 to 18, 2023, the 19th "China Optics Valley" International Optoelectronics Expo and Forum was held in China Optics Valley Science and Technology Exhibition Center. Wuhan Changyingtong Optoelectronic Technology Co., Ltd. is an important participant in the field of optoelectronics. During the exhibition, Dr. Lian Zhenggang, general manager of R&D center, gave a wonderful speech on the square core optical fiber of the company at the new product launch event.

With the extensive application of laser in industry, information, medicine, business, scientific research, military and other fields, the laser industry appears vigorous development. In the industrial field, fiber laser in laser cutting, welding, additive manufacturing and other materials processing market has always maintained a leading position. In view of the following three problems still exist in laser application: (1) improve the power - beam combination. Lack - the right size, the right NA, the right structure of the fiber to match. (2) Pattern matching of the output spot of semiconductor laser. In the face of different types of laser such as semiconductor laser, the particularity of pattern structure requires the core structure matching the output mode. (3) Mode shaping, smoothing of light spots, etc., the mode of square-core fiber fills the core evenly, forming a homogenizing effect, independent of the incident light position.

Chang Ying Tong has developed square core fiber optics, which provide effective solutions to key problems such as fiber bundling, semiconductor laser mode matching and spot homogenization. First of all, square core fiber solves some problems of fiber bundling. The traditional circular fiber has problems of uneven beam superposition and energy loss when bundling, but square core fiber realizes tight stack of fiber and efficient output through its special square section design, improves the power density and transmission efficiency of the beam, and makes the beam bundling more stable and uniform.

Secondly, square-core fiber solves the problem of mode matching in semiconductor laser. The output mode of semiconductor laser is usually Gaussian, but the traditional circular fiber output mode does not match with it, resulting in low energy conversion efficiency. Square-core fiber has the characteristics matching the output mode of semiconductor laser, which can perfectly capture and transmit laser energy, improve energy conversion efficiency, and ensure high-quality beam output.

Finally, square core fiber solves the problem of spot homogenization. In some applications, the laser energy needs to be evenly distributed on the spot to ensure the consistency and stability of the machining effect. The traditional circular fiber has the problem of uneven spot distribution, but the square-core fiber can realize the uniform distribution of spot energy, provide stable and even beam output, and meet the requirements of spot homogenization through its special structural design.

A research report from Trent University in the Netherlands shows that compared with circular core fibers, square core fibers have obvious advantages of homogenizing light spots, and are not subject to the location of incident light, so it is easier to achieve high quality coupling efficiency. In summary, square core fiber has three advantages: (1) the "best" geometric precision - core size error < 0.5μm; (2) Localization rate is "the highest" - square core optical fiber products, including domestic equipment, raw materials and so on, are developed and manufactured based on self-help intellectual property rights produced in the country; (3) The "most" widely used - in the domestic head laser manufacturers to complete the verification, product performance is excellent and stable; At the same time, it can provide customized products and services.

In this speech, Dr. Lian Zhenggang gave full play to his expert advantages and actively interacted and communicated with guests from all walks of life. The whole atmosphere was warm. The new product release and technology display at the Wuhan Optical Expo further consolidated Changyingtong Company's leading position in the field of optoelectronics. The successful application of square core fiber will inject new vitality into the development of laser technology and help related industries achieve a higher level of innovation and results.

In the future, Changyingtong will continue to devote itself to the innovation and production of special fiber technology, and launch more innovative and high-performance products, such as rectangular core and octagonal core fiber, so as to provide more efficient and reliable solutions for laser applications.

Source: Changyingtong Optoelectronics