Aberration correction for SLM-generated Bessel beams propagating through tilted interfaces
Aberration correction for SLM-generated Bessel beams propagating through tilted interfaces
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DOI：
10.1016/j.optcom.2020.126213
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发表时间：
2020-11
影响因子：
2.4
通讯作者：
He Cheng;Chun Xia;S. Kuebler;Xiaoming Yu
中科院分区：
文献类型：
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作者：
He Cheng;Chun Xia;S. Kuebler;Xiaoming Yu
众所周知，当输入光以倾斜角度入射时，轴棱镜形成像差的贝塞尔光束，并且可以通过向轴棱镜添加椭圆度来消除该像差。目前的工作表明，当光束路径中存在附加的倾斜光学窗口时，该方法不能沿贝塞尔光束的整个景深恢复。这种情况在高级应用中越来越常见，其中样品可能驻留在两个载玻片之间、真空室内或气密性外壳中。介绍了一种改进的方法，即利用空间光调制器上的单个位相图来产生贝塞尔光束，同时补偿倾斜入射(相当于倾斜的轴锥)引起的像差和附加倾斜光学窗口引起的像差。波束质量指标被用来量化新方法的有效性。这项工作将贝塞尔光束的适用性扩展到其他制造、成像和信号处理模式。
It is known that an axicon forms an aberrated Bessel beam when the input light is incident at an oblique angle, and the aberration can be removed by adding ellipticity to the axicon. The present work shows that the approach does not recover the Bessel beam along its entire depth of field when an additional tilted optical window is present in the beam path. This situation is increasingly common in advanced applications, where the sample may reside between two glass slides, within a vacuum chamber, or in a gas-tight enclosure. An improved method is introduced in which a single phase map on a spatial light modulator is used to generate the Bessel beam and compensate for both the aberration caused by oblique incidence (equivalent to the tilted axicon) and that due to an additional tilted optical window. Beam-quality metrics are used to quantify the effectiveness of the new method. This work extends the applicability of Bessel beams to other modes of fabrication, imaging, and signal processing.