| 林勇,胡家升.实现长焦深的衍射光学元件设计方法[J].,2010,(1):152-156 |
| 实现长焦深的衍射光学元件设计方法 |
| Method for design of diffractive optical elements with long focal depth |
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| DOI：10.7511/dllgxb201001028 |
| 中文关键词: 光学设计 衍射光学元件 长焦深 |
| 英文关键词: optical design diffractive optical elements (DOE) long focal depth\@ |
| 基金项目:国家自然科学基金资助项目60877003. |
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| 摘要点击次数: 1101 |
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| 中文摘要: |
| 提出了一种设计长焦深小焦斑衍射光学元件的方法．该方法采用ZEMAX光学设计程序，利用能量守恒原理求解目标函数，并综合考虑焦斑大小保持不变的要求，对目标函数进行了修正，通过修正后的函数来约束输出光束在焦深范围内的轴上位置，从而完成衍射光学元件的相位优化，并求得相应的工艺参数．该元件不但可以使激光束具有长焦深和小焦斑，而且还具有可加工性．焦深范围能达到2 mm，焦深范围内光斑半径在5.32~10.48 μm变化，与相同参数的传统光学元件相比，焦深增加了8倍，焦斑半径变化很小，而普通光学元件在此范围内最大焦斑半径达到102.9 μm．该方法为长焦深元件的设计、加工与制造提供了可行方案． |
| 英文摘要: |
| A method of the design of diffractive optical elements (DOE) with long focal depth and small focus dot is presented. The ZEMAX software was used in the method .The objective function was firstly deduced from the energy conservation principle. And then, the function was further revised to satisfy the requirement of small focus dot within long focal depth and constrain the axial position of output beam to optimize the phase of DOE. A DOE was designed by using the obtained objective function, and the corresponding parameters were obtained. Experimental results prove the effectiveness of the proposed method. The focal depth of the designed DOE is 2 mm, which is 8 times of that of a traditional optical element. The focus spot radius varies between 5.32 and 10.48 μm, considerably smaller than the spot radius of a conventional element, which is up to 102.9 μm in the same range. It is testified a valid approach for the design and manufacture of diffractive optical elements with long focal depth. |
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