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Shanghai Optical Machinery Institute has made progress in the formation mechanism of high-power laser nonlinear thermal image
[ Instrument network instrument research and development ] Recently, the High Power Laser Physics Joint Laboratory of Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences has made progress in the study of Kerr effect induced nonlinear thermal imaging effects in high power laser transmission. The team researched and discovered a new phenomenon of multi-peak thermal imaging with the steep dependence of defect edges, and explored the mechanism behind it and the critical conditions for the formation of multi-peaks. Relevant results were published on Optics Express.
The thermal image is a local light field enhancement effect caused by the nonlinear self-focusing effect, and its peak intensity can reach several to tens of times the average light intensity, which is a key factor limiting the output capability of high-power lasers. Existing thermal imaging studies have shown that a single defect will produce a thermal image on the downstream conjugate plane of the nonlinear medium, and under the condition of multiple defects or cascaded nonlinear media, there may even be an on-axis multimodal thermal image. The position distribution law of the thermal image and the degree of light field enhancement are an important basis for the safety design of the driver, and it is extremely important for the prediction and avoidance of the thermal image in the system link.
The research team found that even under the action of a single piece of nonlinear medium, a single defect can produce a bimodal thermal image under certain conditions. Whether a bimodal structure can be produced and the peak intensity show a strong dependence on the sharpness of the defect edge. The research team used the super-Gaussian model to simulate the edge steepness of the defect. The simulation analysis results show that the hard-edge diffraction is the main reason for the formation of the bimodal thermal image. The bimodal thermal image determined by the defect size and the super-Gaussian order is given. Critical conditions for image formation. The discovery of bimodal thermal imaging induced by a single defect has a profound impact, because the intensity of the bimodality is sufficient to cause damage to the optical element, and the existence of the second peak behind the conjugate plane is a potential threat that has been overlooked. This work provides a new dimension for the research of nonlinear thermal imaging. The research results have important guiding significance for the defect assessment of optical components in high-power laser systems, system layout design, and terminal load capacity improvement.
Related research is supported by the National Natural Science Foundation of China, the Shanghai Natural Science Foundation of China, the Youth Innovation Promotion Association of the Chinese Academy of Sciences, and the Chinese Academy of Sciences Strategic Pilot Project (Class A).