Li Xinghua, Gao Yuxuan, Lin Yixin, Fang Wannian, Zhang Jinjing, Wang Zhiguo, Zhang Yanpeng
Opt Lett. 2020 May 15;45(10):2930-2933. doi: 10.1364/OL.393566.
We use a conventional linear Airy beam to prepare a nonlinear Airy beam via four-wave mixing (FWM) and six-wave mixing (SWM) processes in an atomic vapor. We find that its ballistic trajectory is a result of the competition between the transverse self-acceleration and nonlinear phase shift, and the intensity of Airy beam's sub lobes or main lobe is suppressed due to destructive interference of the FWM and SWM processes. By controlling the nonlinear overlap area of the linear Airy beam and two Gaussian beams, we find that the Airy beam's profile varies from one-dimensional (1D) to two-dimensional (2D). The profile evolution process can be applied to create a new (to our knowledge) type of nonlinear filter. In addition, we also observe the Airy beam's pattern in momentum space with electromagnetically induced transparency (EIT) in an atomic vapor. Our research results open up new possibilities for manipulating Airy beams that cannot be achieved with a conventional Airy beam.
我们利用传统的线性艾里光束，通过原子蒸汽中的四波混频（FWM）和六波混频（SWM）过程来制备非线性艾里光束。我们发现其弹道轨迹是横向自加速与非线性相移之间竞争的结果，并且由于FWM和SWM过程的相消干涉，艾里光束子瓣或主瓣的强度受到抑制。通过控制线性艾里光束与两束高斯光束的非线性重叠区域，我们发现艾里光束的轮廓从一维（1D）变为二维（2D）。这种轮廓演化过程可用于创建一种新的（据我们所知）非线性滤波器类型。此外，我们还在原子蒸汽中利用电磁诱导透明（EIT）观察到了动量空间中的艾里光束图案。我们的研究结果为操控传统艾里光束无法实现的艾里光束开辟了新的可能性。
