基于空间光调制器构建二维任意形状的87Rb原子阵列

Construction of two-dimensional arbitrary shape 87Rb atomic array based on spatial light modulator

超冷原子系统是一个纯净的、高度可控的量子体系,可对凝聚态物理、高能物理、天体物理和化学反应等领域的重要物理问题进行量子模拟.构造不同构型的光晶格是模拟多样化的复杂量子系统的一个重要前提.本文采用权重Gerchberg-Saxton算法生成多种形状的光晶格全息图,利用液晶型空间光调制器和高分辨率光学系统,把全息图(动量空间)变换到实空间构造出多种形状的二维晶格阵列,包括简单的三角、六角、正方晶格和更为复杂的蜂巢晶格等,并实现对87Rb超冷原子二维晶格阵列的装载,晶格的最小间距为3μm.这种方法具有通用性强、操控灵活的优势,将有助于拓展光晶格中超冷原子量子模拟的应用.

The ultra-cold atomic system is a clean and highly controllable quantum system,which can be used for quantum simulation of important physical problems in many fields such as condensed matter physics,high-energy physics,astrophysics,and chemical reactions.The constructions of optical lattices with different configurations are an important prerequisite for simulating diverse complex quantum systems,especially solid materials.In this work,we use weighted Gerchberg-Saxton algorithm to generate holograms.By using liquid crystal spatial light modulator and high-resolution imaging system,holograms(in momentum space)are transformed into images in real space for constructing various two-dimensional(2D)optical trap arrays,such as simple triangular,hexagonal,square lattice and more complex honeycomb lattice.We load 87Rb ultra-cold atoms into the 2D optical trap arrays with a minimal spacing of 3μm in between.This method is versatile and flexible,which is helpful in expanding the application scope of quantum simulation with optical lattices.