Simulation and representation turbulent wavefront according to transformation Gaussian lasers into patterned light fields by diffractive micro-optics elements

Yong Qu; Xinyu Zhang; Hongshi Sang; Changsheng Xie

doi:10.1117/12.2034699

23 August 2013 Simulation and representation turbulent wavefront according to transformation Gaussian lasers into patterned light fields by diffractive micro-optics elements

Yong Qu, Xinyu Zhang, Hongshi Sang, Changsheng Xie

Author Affiliations +

Proceedings Volume 8911, International Symposium on Photoelectronic Detection and Imaging 2013: Micro/Nano Optical Imaging Technologies and Applications; 89110S (2013) https://doi.org/10.1117/12.2034699
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China

Abstract

A design method of diffractive micro-optics elements based on the diffractive integral theory for simulating and representing the turbulent wavefront in infrared wavelength region, and the fabrication technologies mainly consisted of electron beam photolithography and low-cost anisotropic wet etching, are developed in this paper. We simulate the diffraction propagation process according to the Rayleigh-Sommerfeld (RS) diffractive theory or the angular spectrum diffraction theory. The modified Gerchberg-Saxton (GS) algorithm for modeling and simulation so as to easily realize the iterative transmission process from the input plane to the output, which is employed as the design optimization algorithm of diffractive micro-optics elements, is investigated. Several elements are fabricated quickly through a low cost semiconductor technological process. Infrared diffractive optical elements produced by the method are mainly used to form complex far field patterns related with atmospheric flow such as typical turbulence. The elements can transfer common Gaussian beams into desired patterns correspondent to atmospheric turbulence through creating fine phase microstructures with needed size and depth or height over the surface of the elements. The fine surface morphologies of the elements, which originate from the simple planar patterns in photomask and further etched into the wafer, are created by the software based on the phase distribution designed. The diffractive micro-optics elements for generating several typical light field patterns have been fabricated quickly. Experiments show that the method can achieve several special light field simulations. Future work will mainly include a more realistic model for light field generation in atmospheric turbulence.

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Yong Qu, Xinyu Zhang, Hongshi Sang, and Changsheng Xie "Simulation and representation turbulent wavefront according to transformation Gaussian lasers into patterned light fields by diffractive micro-optics elements", Proc. SPIE 8911, International Symposium on Photoelectronic Detection and Imaging 2013: Micro/Nano Optical Imaging Technologies and Applications, 89110S (23 August 2013); https://doi.org/10.1117/12.2034699

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KEYWORDS

Diffraction

Wavefronts

Turbulence

Micro optics

Diffractive optical elements

Etching

Atmospheric propagation

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