中文摘要：

提出了激光以一定角度入射液芯光纤（LCOF）产生空心光束（HLB）的方法。利用Zemax软件对产生系统建模，理论分析了HLB的暗斑尺寸Dss和光束宽度随传播距离、LCOF的长度与芯径的变化规律，并以CS2作为芯液材料，用630nm半导体激光器对部分理论结果进行了实验验证。研究表明，通过改变激光入射角度可获得Dss可调的HLB，其Dss和光束宽度几乎不受LCOF长度的影响，但与芯径大小有关。该方法操作简便、成本低、Dss调整范围大，可满足不同应用领域的需求。

英文摘要：

A method of producing a hollow laser beam （HLB） by directing the laser beam at a certain angle into a liquid core optical fiber （LCOF） is presented. The dependences of dark spot size Dss and beam width of the HLB on the propagation distance, and the length and core diameter of the LCOF are theoretically analyzed by modeling the generation system using Zemax. Using CS2 as core-liquid material, a part of theoretical result is experimentally demonstrated with 630 nm semiconductor laser. The results show that HLBs with adjustable Dss are obtained by changing the incident angle of the laser beam. Dss and beam width of the HLB are independent of the LCOF length, while related to its core diameter. This method has advantages of convenient operation, low cost and wide adjustable range of Dss. It can satisfy the needs of different applications.