A novel fiber collimator with the rod lens for coherent beam combination of fiber laser array

Shuyue He; Yanxing Ma; Gen Luo; Zilun Chen; Pengfei Ma; Rongtao Su; Pu Zhou; Lei Si

doi:10.1117/12.2647201

10 May 2023 A novel fiber collimator with the rod lens for coherent beam combination of fiber laser array

Shuyue He, Yanxing Ma, Gen Luo, Zilun Chen, Pengfei Ma, Rongtao Su, Pu Zhou, Lei Si

Proceedings Volume 12554, AOPC 2022: Advanced Laser Technology and Applications; 1255418 (2023) https://doi.org/10.1117/12.2647201
Event: Applied Optics and Photonics China 2022 (AOPC2022), 2022, Beijing, China

Abstract

Coherent beam combination of fiber lasers is considered to be a promising technology to obtain high-brightness laser. In tiled-aperture coherent beam combination, in order to obtain the best combination effect, a high fill factor is required for the beam array output from the fiber collimators. Thus, the collimator array must be closely arranged and each single-mode Gaussian beam must be truncated, which brings great difficulties to design a fiber collimator. We propose a scheme of fiber collimator based on rod lens, which compares to the fiber collimator with the thin lens, has the following advantages. Firstly, rod lenses for beam collimation can be arranged in an array without a frame to get a high fill factor of fiber collimators. Secondly, the single-mode Gaussian beam from fiber can be truncated in any proportion to get a good result of coherent beam combination. Thirdly, almost all of the laser energy output from a fiber include the stray light with the large NA is emitted into space outside the collimator by the rod lens. Fourth, the structure of fiber collimator with the rod lens is simple, which makes it easy to build a large number of fiber lasers array. In this paper, we have developed a rod lens collimator and carried out the preliminary experiments, the results show that the rod lens collimator can emit a collimated beam with the good beam quality, and all stray light with the large NA in the collimator can be exported to space.

Citation Download Citation

Shuyue He, Yanxing Ma, Gen Luo, Zilun Chen, Pengfei Ma, Rongtao Su, Pu Zhou, and Lei Si "A novel fiber collimator with the rod lens for coherent beam combination of fiber laser array", Proc. SPIE 12554, AOPC 2022: Advanced Laser Technology and Applications, 1255418 (10 May 2023); https://doi.org/10.1117/12.2647201

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KEYWORDS

Collimators

Fiber lasers

Coherent beam combination

Collimation

Near field

CCD cameras

Microlens

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