Mr. Kefeng Tu Profile

Kefeng Tu

at Hefei Univ of Technology

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Proceedings Article | 19 December 2022 Poster + Paper

Multi-channel acousto-optic modulator based on crossed trapezoid array electrodes

Liang Li, Yonglin Yin, Kefeng Tu, Yucong Wang, Kunying Li, Zi Wang, Guoqiang Lv

Proceedings Volume 12318, 123182B (2022) https://doi.org/10.1117/12.2643635

KEYWORDS: Electrodes, Acoustics, Bragg cells, Transducers, Acousto-optics, Diffraction, Crystals, Fourier transforms, Collimation, Wave propagation

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ulti-channel acousto-optic modulator is an acousto-optical device with multiple transducers modulated in parallel, which main applications are in microfabrication and direct writing lithography. Crosstalk has been a key problem in multi-channel acousto-optical devices due to the proximity of the channels and the diffraction of the acoustic waves. Acoustic crosstalk is caused by a certain dispersion angle of the sound beam in the process of spatial propagation, resulting in the sound field of the acousto-optical action medium in a certain propagation distance overlap. Ultrasonic transducer is an important element of the sound energy emission, which generates sound waves through the inverse piezoelectric effect. The shape of the electrodes on the transducer controls the area where the piezoelectric crystal vibrates, further affecting the distribution of the sound field. Therefore, the shape of the electrodes can be changed to improve the collimation of the acoustic beam and thus effectively reduce the acoustic crosstalk problem between channels. Rectangular electrodes are used by most conventional multi-channel acousto-optic modulator. The rectangular electrodes have more acoustic field side lobes, which can cause acoustic crosstalk between sensors and thus affect the quality of the diffracted beam. In this paper, crossed trapezoid array electrodes shape is proposed, for improving the crosstalk problem of multi-channel acousto-optical devices. From the spectral analysis, the crossed trapezoid array electrodes can effectively suppress the side lobes of the acoustic field and improve the collimation of the beam, thus reducing the acoustic beam crosstalk between channels. Simulation and experiments show that multi-channel acousto- optic modulator with crossed trapezoid array electrodes can effectively solve the acoustic beam crosstalk problem between channels and enhance the performance of multi-channel acousto-optic devices.

Proceedings Article | 9 October 2021 Paper

Full-color holographic Maxwellian near-eye display with extended eyebox

Zi Wang, Kefeng Tu, Xu Zhang, Guoqiang Lv, Qibin Feng, Hai Ming, Anting Wang

Proceedings Volume 11898, 118980N (2021) https://doi.org/10.1117/12.2601481

KEYWORDS: Holography, Spatial light modulators, Holograms, Augmented reality, Wavefronts, Optical filters, Eye, Display technology

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Recently, the development of augmented reality (AR)/ virtual reality (VR) has brought new life to holographic display. Holographic Maxwellian display technology, also known as holographic retinal projection display (RPD), is considered as a promising AR near-eye display technology. It can provide consistently sharp two-dimensional images within a range of depth of field without being affected by human eye focusing. Several recent works of holographic Maxwellian near- eye display are introduced. Firstly, we have proposed a hybrid holographic Maxwellian near-eye display based on spherical wave and plane wave reconstruction to extend the depth of field. Secondly, we have proposed a lensless full- color holographic Maxwellian near-eye display with horizontal eyebox expansion using a single spatial light modulator (SLM). Thirdly, we have proposed a conjugate wavefront encoding method to efficiently expand the eyebox for the holographic Maxwellian near-eye display.

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