Mr. Yingjie Song Profile

Yingjie Song

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Proceedings Article | 10 May 2023 Paper

Optical system design of sheet-beam energy homogenization based on total reflection integral cavity

Yingjie Song, Zhen Yang, Jianlong Zhang, Yong Zhang

Proceedings Volume 12554, 125541C (2023) https://doi.org/10.1117/12.2651956

KEYWORDS: Homogenization, Beam shaping, Optical design, Combustion, Zemax, Optical simulations, Laser induced fluorescence, Optoelectronics, Laser applications

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Planar laser-induced fluorescence (PLIF) has been widely used in the two-dimensional (2D) accurate measurements of important combustion parameters due to its high spatiotemporal resolution. One of the problems encountered by PLIF technology is that the current beam shaping technology cannot get a sheet beam that meets the measurement requirements. In order to solve this problem, a new sheet-forming homogenization optical system with long focal-depth is proposed and designed based on total reflection integral cavity. By making the incident Gaussian beam reflected multiple times in the integral cavity, the output beam of single direction homogenization can be obtained. The beam is then passed through a beam expansion collimation system and compressed in the other direction. Finally, the shaping sheet-beam with high uniformity is realized. Based on this principle, the ZEMAX is used to simulate the optical system operating at 283.553nm, and it is found that the effect of the final beam shaping is mainly affected by the entry pupil deviation of the incident laser, the integral cavity length and the angle between two reflecting surfaces of an integrating cavity. After optimizing design parameters, a sheet-beam energy homogenization optical system based on total reflection integral cavity is designed. Finally, the homogeneity evaluation factor is introduced to calculate the homogeneity of output beam quantitatively and it is found that the uniformity of the beam is more than 90%. The sheet-beam can better meet the practical requirements of PLIF measurement.

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