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为解决核物理工程、表面热处理、激光加工、激光通信中传输激光束的均匀性问题,提出采用三角楔柱透镜改善线激光均匀性的新方法,并在ZEMAX开发环境下建立了整形光路系统的理论模型。利用所建立的模型,分析了整形柱透镜在不同半径、斜面夹角、透镜介质折射率等参数下光束的均匀性。研究表明:在远场条件下,通过改变整形柱透镜的参数,能够得到能量分布均匀的线激光。在实际应用中,可以采用1个半圆柱和2个相同三角楔胶合成型的简单工艺。进一步模拟发现,两种整形系统所得到的均匀度和线宽一致。 相似文献
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A super-focusing device composed of a focusing objective and a hyperlens is proposed to focus an incident plane wave into the deep subwavelength dimension. In the device, the objective converts the incident plane wave into a convergent one. The half cylindrical hyperlens can support high wave vector k modes propagating towards its core. So the convergent wave can be focused into an ultrasmall spot beyond the diffraction limit. The layout is proposed for the super-focusing device and its characteristics are investigated theoretically. Numerical simulations verify that the focused beams are confined in a spot with a diameter of 16.3 nm in the focal plane of the focusing objective with a numerical aperture of 0.6, which corresponds to a super-resolution spot of λ0/23 (λ0 is the wavelength in vacuum). The simulations confirm the effectiveness of the proposed device. 相似文献
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设计出变焦投影物镜,能满足相同光学引擎、相同屏幕位置下不同屏幕尺寸的需要。考虑到所设计的系统为大相对孔径、中等视场和小变焦比,从变焦理论出发,采用正组补偿的机械补偿法,对变倍组进行合理的倍率选段,求出了高斯解;然后分组元选用合理的初始结构,利用ZEMAX光学设计软件进行优化设计,解决了变焦系统畸变难以控制的问题,并使用调制传递函数对整个系统进行了综合评价。设计结果表明:该变焦投影物镜系统的光学性能和成像质量均满足设计指标要求,能应用于101.6~177.8cm的大屏幕电视。 相似文献