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Speckle Suppression by Controlling the Coherence in Laser Based Projection Systems

机译：通过控制基于激光的投影系统的相干性来抑制斑点

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摘要

In this paper, the relationship between the coherence and the speckle contrast in a laser-based projection display system is studied with the consideration of human visual percept. By using a varifocal liquid-crystal lens and a monochromatic charge-coupled device (CCD), a system which is used for simulating a human eye is set up to record the speckle pattern. An efficient method for controlling the spatial coherence by using a dielectric elastomeric actuator (DEA) is demonstrated. We find that there is a limitation for eliminating the speckle contrast in the laser projection system when only the method of reducing the spatial coherence is used. When the distance between the observer and the screen is sufficiently large (), the speckle contrast can be eliminated well () by reducing the spatial coherence and the observer do not observe the speckle phenomenon. When the viewing distance is smaller than 3 m, however, the observer will feel the speckle all of the time. To further reduce the speckle contract, a method of wavelength modulation is used to reduce the temporal coherence while the spatial coherence is well reduced. The speckle contrast is reduced to 4% at the viewing distance of 1 m by reducing both the temporal and spatial coherence of the laser.
机译：在本文中，研究了基于激光的投影显示系统中相干性和斑点对比度之间的关系，并考虑了人类的视觉感知。通过使用可变焦距液晶透镜和单色电荷耦合器件（CCD），建立了用于模拟人眼的系统来记录斑点图案。演示了一种通过使用介电弹性体致动器（DEA）控制空间相干性的有效方法。我们发现，当仅使用减小空间相干性的方法时，消除激光投影系统中的斑点对比度存在局限性。当观察者和屏幕之间的距离足够大时（），可以通过减小空间相干性来很好地消除斑点对比度（），并且观察者不会观察到斑点现象。但是，当观看距离小于3 m时，观察者会一直感觉到斑点。为了进一步减小斑点收缩，使用波长调制的方法来减小时间相干性，同时很好地减小空间相干性。通过减少激光的时间和空间相干性，在1 m的观察距离处斑点对比度降低到4％。

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