【摘要】 激光扩束系统在多领域应用广泛，为满足变倍扩束需求，文章采用机械补偿式三组元结构，以BK7和F2材料双胶合透镜组搭建了能提高像质的2～6.4×光学系统。运用Zemax软件，设定了632.8nm激光光源，对组元焦距、初始距离、组元半径进行了优化设计。设计时选取8个扩束比，系统总长控制在250mm内，优化了各种像差，结果表明系统具有出色的成像能力，场曲畸变等像差控制良好；激光发散角在0.05°左右，具有好的准直性；公差对扩束效果影响小；光程差为0.1波长左右，表明不同路径的光线能够保持良好的相位一致性。该系统实现了变倍扩束，成像质量满足要求。更多还原

【Abstract】 Laser beam expansion systems are widely used in various fields. To achieve variable magnification beam expansion, this study employs a three-component mechanically compensated design, incorporating a double-cemented lens group made of BK7 and F2 glass to enhance image quality in a 2～6.4× optical system. Using Zemax software, the system is optimized with a 632.8 nm laser source, refining the focal lengths, initial spacing, and radii of the optical components. Eight expansion ratios are selected, with the total system length constrained within 250 mm. Various aberrations are optimized, and the results demonstrate excellent imaging performance with well-controlled field curvature and distortion. The laser divergence angle is less than 0.05°, indicating good collimation. Tolerance analysis shows minimal impact on beam expansion performance, while the optical path difference of approximately 0.1 wavelength confirms high phase consistency across different light paths. The proposed system successfully achieves variable magnification beam expansion with imaging quality meeting design requirements.更多还原