Near-diffraction-limited flattop laser beam adaptively generated by stochastic parallel gradient descent algorithm

作者：Ma, Haotong; Liu, Zejin^*; Xu, Xiaojun; Wang, Sanhong; Liu, Changhai

来源：Optics Letters, 2010, 35(17): 2973-2975.

DOI：10.1364/OL.35.002973

We demonstrate the adaptive generation of a near-diffraction-limited flattop laser beam in the near field based on the stochastic parallel gradient descent algorithm and dual-phase-only liquid crystal spatial light modulators (LC-SLMs). One LC-SLM redistributes the intensity, and the other compensates the wavefront of the output beam. The experimental results show that approximately 69% of the power is enclosed in a region with less than 6% rms intensity variation. The 5 mm diameter near-diffraction-limited output beam retains a flattop intensity distribution without significant diffraction peaks for a working distance of more than 30 cm.

• 出版日期2010-9-1
• 单位中国人民解放军国防科学技术大学