提出了一种采用并行激光直写技术的数字化全息透镜制作方法,先对离轴全息透镜进行理论模拟,得到条纹分布的数字图像,根据激光直写系统的光学参数,对生成的全息透镜模拟图像进行缩放处理,然后分块拼接曝光,实验得到了尺寸为3.1 mm×3.1 mm的正方形离轴全息透镜,最小条纹周期为1.1μm,在532 nm激光照射下,透镜焦距为6.2 mm,最大空频处一级衍射光的衍射角为5.9°。本方法为制作全息透镜提供了一种有效地新方法。
A digital method of fabricating holographic lens based on parallel laser direct writing technology was introduced. After theoretically simulating off-axis holographic lens, the digital image of holographic strips was got. According to the optical parameters of the parallel laser direct writing system, the simulated image of holographic lens was scaled down and exposed based on merging technology. An off-axis holographic lens with the area of 3. 1 mm × 3.1 mm was got. The minimum space period is 1.1 μm. The focal length is 6.2 mm and the first diffractive angle is 5.9% at the wavelength 532 nm. This is an effective new method for fabricating holographic lens.