Zhou Zhi-Yuan, Li Yan, Ding Dong-Sheng, Jiang Yun-Kun, Zhang Wei, Shi Shuai, Shi Bao-Sen, Guo Guang-Can
1] Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, Anhui 230026, China [2] Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China [3].
1] Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, Anhui 230026, China [2] Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
Sci Rep. 2014 Jul 10;4:5650. doi: 10.1038/srep05650.
Light beams with extraordinary spatial structures, such as the Airy beam (AB), the Bessel-Gaussian beam (BGB) and the Laguerre-Gaussian beam (LGB), are widely studied and applied in many optical scenarios. We report on preparation of light beams with controllable spatial structures through sum frequency generation (SFG) using two Gaussian pump beams in a quasi-phase matching (QPM) crystal. The spatial structures, including multi-ring-like BGB, donut-like LGB, and super-Gaussian-like beams, can be controlled periodically via crystal phase mismatching by tuning the pump frequency or crystal temperature. This phenomenon has not been reported or discussed previously. Additionally, we present numerical simulations of the phenomenon, which agree very well with the experimental observations. Our findings give further insight into the SFG process in QPM crystals, provide a new way to generate light with unusual spatial structures, and may find applications in the fields of laser optics, all-optical switching, and optical manipulation and trapping.
具有特殊空间结构的光束，如艾里光束（AB）、贝塞尔 - 高斯光束（BGB）和拉盖尔 - 高斯光束（LGB），在许多光学场景中得到了广泛研究和应用。我们报道了在准相位匹配（QPM）晶体中使用两束高斯泵浦光束通过和频产生（SFG）制备具有可控空间结构光束的方法。通过调节泵浦频率或晶体温度，利用晶体相位失配可以周期性地控制包括多环状BGB、甜甜圈状LGB和超高斯状光束在内的空间结构。该现象此前尚未见报道或讨论。此外，我们给出了该现象的数值模拟结果，与实验观测结果非常吻合。我们的研究结果进一步深入了解了QPM晶体中的SFG过程，提供了一种产生具有异常空间结构光的新方法，并可能在激光光学、全光开关以及光学操控与捕获等领域找到应用。
