计算机光学元件的算法及实验研究

【作者】 董梅峰；

【导师】 李慎；

【作者基本信息】 电子科技大学 ， 光学， 2004， 硕士

【摘要】 在激光的实际应用中,根据不同的要求,人们常常需要将激光束光强分布加以整形。例如整形为矩形、圆形等。传统光学元件难以实现这种转换,而用计算全息图效率太低。由于计算机光学元件能充分有效地产生任意形状的光波波面,所以,本文主要涉及到研究计算机光学元件的理论设计、计算机模拟、实验研究。本文主要基于几何理论和标量理论来设计计算机光学元件表面的浮雕高度,文中用几何理论推导出了把高斯光束整形为正方框形光束、矩形光束、线形光束的计算机光学元件表面的浮雕公式;通过计算机辅助设计,计算得到了计算机光学元件表面上的浮雕高度,设计出了计算机光学元件。计算机模拟结果与预期得到的衍射图样相符合;文中还讨论了设计参数对成像质量的影响规律。同时,本文还用标量理论设计了把高斯光束整形为正方框形光束的16阶的计算机光学元件,文中主要是参考GS(Gerchberg-Saxton)算法,并在此基础上进行了改进;通过计算机模拟,得到了计算机光学元件表面的浮雕图。计算机模拟得到的结果与预期衍射图样相符合;文中还设计了把高斯光束整形为矩形、人形、鸟形以及多圆环形分布的光束的计算机光学元件,模拟结果与预期结果相符合。文中对上述两种设计理论得到的模拟结果进行了比较,得出有一定参考价值的结论,对今后设计计算机光学元件具有指导性意义。文章的第五章进行了实验验证,取得了令人满意的实验结果,同时也证明了设计方法和理论推导的正确性。更多还原

【Abstract】 In the laser’s actual application, according to the different request, people usually need to shape the intension of laser beam. For example, shaping the laser beam to rectangle or circular etc. The traditional optical elements are difficult to realize these kinds of conversion, and the efficiency of the calculation hologram is too low. Because of the computer optical elements can shape the laser beam to arbitrary shape, so, in this paper we mainly study the designation and the experimentation of the computer optical elements.This paper we design the relief height of the computer optical elements mainly based on the geometrical theory and the scalar quantity diffractive theory. Based on the geometrical theory, we achieved the height of phase relief that can shape the laser beam to square frame 、rectangle shape、line shape; With the computer simulation and drawing program, the diffraction patterns are got in this paper, the results agreed with the anticipated diffraction patterns; in this paper we also discussed the affects to the diffraction patterns by change the parameters.This paper also designs the computer optical elements of 16 level based on the scalar quantity diffractive theory. We mainly reference to the algorithm of GS(Gerchberg-Saxton)and improve it. With the computer simulation and drawing program, the diffraction patterns are got in this paper, the results agreed with the anticipated diffraction patterns; in the paper we also design the computer optical elements that can shape the laser beam to rectangle shape、the sportsman shape、the bird shape and so on. The simulation results agreed with the anticipated diffraction patterns.In the paper we compared the simulation results of the computer optical elements based on the two different theories, and summarized the advantage and disadvantage of the two different theories. That will bring Leading meaning to the designation of the computer optical elements.In chapter 5 we proved the accuracy of the design theories and the theoretical deduces by the experimentation.更多还原