光学学报, 2020, 40 (1): 0111016, 网络出版: 2020-01-06
激光通过不同厚度的强散射介质的聚焦 下载: 1414次
Focusing of Laser Through Strong Scattering Media with Different Thicknesses
成像系统 散射 聚焦 相位调制 散射介质厚度 光强增长因子 imaging systems scattering focusing phase modulation thickness of scattering medium enhancement factor of intensity
摘要
通常情况下,激光光束经过散射介质后会产生无序的散斑。基于波前相位调制技术,利用连续序列算法结合四步相移法对入射激光的波面进行相位调制,使其通过散射介质在目标位置处形成聚焦。实验着重研究激光经过不同厚度的强散射片样品的聚焦,讨论散射介质的厚度与聚焦点光强增长因子的关系。实验结果表明,透过的散射介质越厚,聚焦光斑尺寸越小,目标位置处聚焦点的光强增长因子也越小。
Abstract
In general, disordered speckles occur when a laser beam passes through a scattering medium. Based on wavefront phase modulation technology, we apply a continuous sequential algorithm combined with a four-step phase-shifting technology to phase modulation of the wavefront of the incident laser so that it can focus on the target position when the laser passes through the scattering medium. The experiments primarily investigate the focusing of the laser passing through the strong scattering-medium samples with different thicknesses, and discuss the influence of the scattering-medium thickness upon the enhancement factor of intensity at the focal point. The experimental results show that with the increase in the thickness of the scattering medium, the size of the focal spot and the enhancement factor of intensity of the focal point at the target position decrease.
李琼瑶, 扎西巴毛, 陈子阳, 蒲继雄. 激光通过不同厚度的强散射介质的聚焦[J]. 光学学报, 2020, 40(1): 0111016. Qiongyao Li, Bamao Zhaxi, Ziyang Chen, Jixiong Pu. Focusing of Laser Through Strong Scattering Media with Different Thicknesses[J]. Acta Optica Sinica, 2020, 40(1): 0111016.