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Thermal stability of wavefront shaping using a DMD as a spatial light modulator
Optics Express ( IF 3.2 ) Pub Date : 2021-12-01 , DOI: 10.1364/oe.442284
Benjamin Rudolf 1, 2 , Yang Du 1 , Sergey Turtaev 1 , Ivo T. Leite 1, 3 , Tomáš Čižmár 1, 2, 4
Affiliation  

Computer-controlled spatial modulation of coherent light has enabled multiple new ways of imaging through complex media. MEMS-based digital micromirror devices (DMDs) employed as spatial light modulators present considerably higher display frame rates compared to the popular alternative based on liquid crystal technology. For a progress beyond laboratory conditions, the digital hologram projected with a DMD needs to remain time-invariant after the wavefront correction. The thermal load of the DMD when operating at the highest display frame rates is one of the main sources of wavefront deviations that significantly impacts the imaging performance over time. In this work, we studied the wavefront deviations induced by temperature variation of the DMD, and show that they correspond to low-order aberrations which can be represented by Zernike polynomials up to the second order. Further, we study their influence on the focussing quality using wavefront shaping on two popular model systems – a highly-scattering diffuser and a multimode optical fibre – and verify a rapid degradation as the DMD temperature departs from the initial calibration temperature. By actively controlling and stabilizing the temperature of the DMD with a thermoelectric cooler, we demonstrate that the stability of high-speed DMD-based wavefront shaping systems can be greatly extended in time, without the need for recalibration.

中文翻译:

使用 DMD 作为空间光调制器的波前整形的热稳定性

计算机控制的相干光空间调制使通过复杂介质成像的多种新方法成为可能。与基于液晶技术的流行替代方案相比,用作空间光调制器的基于 MEMS 的数字微镜器件 (DMD) 具有更高的显示帧速率。对于超出实验室条件的进展,使用 DMD 投影的数字全息图需要在波前校正后保持时不变。DMD 在以最高显示帧速率运行时的热负载是波前偏差的主要来源之一,随着时间的推移会显着影响成像性能。在这项工作中,我们研究了 DMD 温度变化引起的波前偏差,并证明它们对应于低阶像差,可以由高达二阶的泽尼克多项式表示。此外,我们在两个流行的模型系统(高散射漫射器和多模光纤)上使用波前整形研究了它们对聚焦质量的影响,并验证了当 DMD 温度偏离初始校准温度时会出现快速退化。通过使用热电冷却器主动控制和稳定 DMD 的温度,我们证明了基于高速 DMD 的波前整形系统的稳定性可以大大延长,而无需重新校准。我们在两个流行的模型系统(高散射漫射器和多模光纤)上使用波前整形研究了它们对聚焦质量的影响,并验证了当 DMD 温度偏离初始校准温度时会出现快速退化。通过使用热电冷却器主动控制和稳定 DMD 的温度,我们证明了基于高速 DMD 的波前整形系统的稳定性可以大大延长,而无需重新校准。我们在两个流行的模型系统(高散射漫射器和多模光纤)上使用波前整形研究了它们对聚焦质量的影响,并验证了当 DMD 温度偏离初始校准温度时会出现快速退化。通过使用热电冷却器主动控制和稳定 DMD 的温度,我们证明了基于高速 DMD 的波前整形系统的稳定性可以大大延长,而无需重新校准。
更新日期:2021-12-06
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