Compensation for the phase-type spatial periodic modulation of the near-field beam at 1053 nm

Yaru Gao; Dean Liu; Aihua Yang; Ruyu Tang; Jianqiang Zhu

doi:10.1117/12.2284954

24 October 2017 Compensation for the phase-type spatial periodic modulation of the near-field beam at 1053 nm

Yaru Gao, Dean Liu, Aihua Yang, Ruyu Tang, Jianqiang Zhu

Proceedings Volume 10457, AOPC 2017: Laser Components, Systems, and Applications; 104572V (2017) https://doi.org/10.1117/12.2284954
Event: Applied Optics and Photonics China (AOPC2017), 2017, Beijing, China

Abstract

A phase-only spatial light modulator is used to provide and compensate for the spatial periodic modulation (SPM) of the near-field beam at the near infrared at 1053nm wavelength with an improved iterative weight-based method. The transmission characteristics of the incident beam has been changed by a spatial light modulator (SLM) to shape the spatial intensity of the output beam. The propagation and reverse propagation of the light in free space are two important processes in the iterative process. The based theory is the beam angular spectrum transmit formula (ASTF) and the principle of the iterative weight-based method. We have made two improvements to the originally proposed iterative weight-based method. We select the appropriate parameter by choosing the minimum value of the output beam contrast degree and use the MATLAB built-in angle function to acquire the corresponding phase of the light wave function. The required phase that compensates for the intensity distribution of the incident SPM beam is iterated by this algorithm, which can decrease the magnitude of the SPM of the intensity on the observation plane. The experimental results show that the phase-type SPM of the near-field beam is subject to a certain restriction. We have also analyzed some factors that make the results imperfect. The experiment results verifies the possible applicability of this iterative weight-based method to compensate for the SPM of the near-field beam.

Citation Download Citation

Yaru Gao, Dean Liu, Aihua Yang, Ruyu Tang, and Jianqiang Zhu "Compensation for the phase-type spatial periodic modulation of the near-field beam at 1053 nm", Proc. SPIE 10457, AOPC 2017: Laser Components, Systems, and Applications, 104572V (24 October 2017); https://doi.org/10.1117/12.2284954

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