Departamento de Optica, Facultad de Ciencias Físicas, Universidad Complutense de Madrid, 28040, Madrid, Spain.
Opt Lett. 2010 Mar 1;35(5):652-4. doi: 10.1364/OL.35.000652.
We present an approach to generate paraxial laser beams with arbitrary spatial distribution in the femtosecond time regime. The proposed technique is based upon a pair of volume phase holographic gratings working in parallel arrangement. It exploits the spatial coherence properties of the incoming laser beam in a compact and robust setup that mitigates angular and spatial chirp. The gratings were recorded in a photopolymerizable glass with a high optical damage threshold and a large optical throughput. Setup performance is studied and experimentally demonstrated by generating Laguerre-Gaussian femtosecond pulses.
我们提出了一种在飞秒时间域中生成具有任意空间分布的傍轴激光束的方法。所提出的技术基于一对工作在平行排列的体相位全息光栅。它利用了入射激光束的空间相干性，在一个紧凑且稳健的设置中减轻了角度和空间啁啾。光栅是在具有高光学损伤阈值和大光学透过率的光聚合玻璃中记录的。通过生成拉盖尔-高斯飞秒脉冲来研究和实验演示了该设置的性能。
