High-precision laser beam shaping using binary-amplitude DLP spatial light modulators
High-precision laser beam shaping using binary-amplitude DLP spatial light modulators
复制标题
使用二元振幅 DLP 空间光调制器进行高精度激光束整形
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
D. Heinzen
中科院分区：
文献类型：
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作者：
M. Becker;Jinyang Liang;R. Kohn;D. Heinzen
具有精确控制强度分布的激光束对于光学和光学物理的许多领域至关重要。我们从现实世界的激光中产生这样的光束：直接从激光和扩束望远镜获得的准高斯光束，无需空间过滤。我们的应用是在量子模拟器中形成玻色-爱因斯坦凝聚态的光学驻波晶格。这需要受控的幅度和平坦的相位，并且光束不受像素抖动或刷新周期的时间调制。我们描述了图案设计算法的开发，并展示了高精度光束整形器的性能，以制作具有类似低空间频率内容的平顶光束和其他空间轮廓。数字微镜器件 (DMD) 通过包含针孔低通滤波器的望远镜进行成像。使用误差扩散算法根据输入光束轮廓设计初始 DMD 像素图案。该模式根据输出图像测量结果进行迭代细化。我们演示了形成各种光束轮廓，包括平顶光束和具有一维线性强度变化的光束，均具有方形和圆形横截面。产生的光束相对于目标轮廓的均方根 (RMS) 误差小于 0.25%，并且相位接近平坦。
Laser beams with precisely controlled intensity profiles are essential for many areas of optics and optical physics. We create such beams from real-world lasers: quasi-Gaussian beams obtained directly from a laser and beam-expanding telescope without spatial filtering. Our application is to form optical standing-wave lattices for Bose-Einstein condensates in quantum emulators. This requires controlled amplitude and flat phase, and that the beam be free of temporal modulation from either pixel dithering or refresh cycles. We describe the development of the pattern design algorithms and demonstrate the performance of a high precision beam shaper to make flattop beams and other spatial profiles with similarly low spatial frequency content. The digital micromirror device (DMD) was imaged through a telescope containing a pinhole low-pass filter. An error diffusion algorithm was used to design the initial DMD pixel pattern based on the input beam profile. This pattern was iteratively refined based on output image measurements. We demonstrate forming a variety of beam profiles including flattop beams and beams with 1-D linear intensity variation, both with square and circular cross-sections. Produced beams had less than 0.25% root-mean-square (RMS) error with respect to the target profile and nearly flat phase.