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PAN Guo-tao, YAN Yu-feng, YU Xin, ZHANG Lei, SUN Kuo, BAI Su-ping, SUN Hong-shen. Design of optical system for quality evaluation of large rectangular aperture laser beam[J]. Chinese Optics. doi: 10.37188/CO.2021-0130
Citation: PAN Guo-tao, YAN Yu-feng, YU Xin, ZHANG Lei, SUN Kuo, BAI Su-ping, SUN Hong-shen. Design of optical system for quality evaluation of large rectangular aperture laser beam[J]. Chinese Optics. doi: 10.37188/CO.2021-0130

Design of optical system for quality evaluation of large rectangular aperture laser beam

doi: 10.37188/CO.2021-0130
Funds:  Supported by Science and technology Development Project of Jilin Province (No. 20200401054GX); Youth Fund of Changchun University of Science and Technology (No. XQNJJ-2019-01); “13th Five-Year” Science and Technology Project of Education Department of Jilin Province (No. JJKH20200756KJ); The 111 project of China (No. D21009)
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  • Adaptive optical correction technology can effectively improve the beam quality of solid slab lasers, but with the increase of laser output power, the output beam aperture and the system volume gradually increase, which makes the design of adaptive optical correction systems difficult. Therefore, under the premise of meeting the requirements of conjugate detection in the adaptive optical correction system, it is of certain research significance to optimize the size parameters of the detection system as a whole, and realize the detection of multiple parameters such as wavefront phase and beam quality. In this paper, we achieve the multi-parameter detection of a 160 mm×120 mm rectangular beam emitted by a slab laser when the overall size of the system is 350 mm×180 mm×220 mm (length × width × height). According to the technical requirements of large detection apertures, there are limitations in tube length and long exit pupil distance. Firstly, the dual-Gaussian initial structure was used to eliminate the aberration. Combined with the aspheric surface technology, the design scheme of splitting detection after high-ratio beam compression was adopted to achieve the simultaneous detection and evaluation of multiple parameters. Secondly, the initial parameters of the system were determined based on the principles of telephoto imaging and conjugate imaging. Thirdly, the simulation model of the detection system was established to analyze the imaging quality and the tolerance of the system, which were carried out to provide the basis for the construction of the experiment. Finally, the experiments were built to verify the design results. Results indicate that the conjugate wavefront detection, light intensity uniformity detection and beam quality evaluation of a 160 mm × 120 mm rectangular beam can be realized under the object-image conjugation and size constraint conditions. In the experiment, the β factor of the measured beam is 1.24 times the diffraction limit, and the uniformity is 73.8 %, which meets the technical requirements.
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