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首页> 外文会议>SPIE Conference on Emerging Digital Micromirror Device Based Systems and Applications >High Precision Laser Beam Shaping Using Binary-Amplitude DLP Spatial Light Modulators
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High Precision Laser Beam Shaping Using Binary-Amplitude DLP Spatial Light Modulators

机译：使用二进制幅度DLP空间光调制器的高精度激光束整形

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摘要

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.
机译：具有精确控制的强度配置文件的激光束对于许多光学和光学物理学领域至关重要。我们从现实世界的激光器创造出这样的梁：直接从激光和光束扩张望远镜获得的准高斯光束而没有空间滤波。我们的应用是在量子仿真器中形成用于Bose-Einstein凝聚物的光学站波格。这需要受控的幅度和平相，并且光束不受像素抖动或刷新周期的时间调制。我们描述了模式设计算法的开发，并展示了高精度光束整形器的性能，以使堆积光束和具有类似的空间频率内容的其他空间分布。数字微镜器件（DMD）通过包含针孔低通滤波器的望远镜对成像。误差扩散算法用于基于输入光束轮廓设计初始DMD像素图案。基于输出图像测量值迭代地精制这种模式。我们展示了各种梁轮廓，包括扁平梁和具有1-D线性强度变化的横梁，两者都是方形和圆形横截面。产生的光束相对于目标曲线和几乎平坦的阶段具有小于0.25％的根均方（RMS）误差。

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