Chriki Ronen, Barach Gilad, Tradosnky Chene, Smartsev Slava, Pal Vishwa, Friesem Asher A, Davidson Nir
Opt Express. 2018 Feb 19;26(4):4431-4439. doi: 10.1364/OE.26.004431.
A rapid and efficient all-optical method for forming propagation invariant shaped beams by exploiting the optical feedback of a laser cavity is presented. The method is based on the modified degenerate cavity laser (MDCL), which is a highly incoherent cavity laser. The MDCL has a very large number of degrees of freedom (320,000 modes in our system) that can be coupled and controlled, and allows direct access to both the real space and Fourier space of the laser beam. By inserting amplitude masks into the cavity, constraints can be imposed on the laser in order to obtain minimal loss solutions that would optimally lead to a superposition of Bessel-Gauss beams forming a desired shaped beam. The resulting beam maintains its transverse intensity distribution for relatively long propagation distances.
提出了一种利用激光腔的光学反馈来形成传播不变形状光束的快速高效全光学方法。该方法基于改进的简并腔激光器（MDCL），它是一种高度非相干腔激光器。MDCL具有大量可耦合和控制的自由度（我们系统中有320,000个模式），并允许直接访问激光束的实空间和傅里叶空间。通过在腔内插入振幅掩模，可以对激光施加约束，以获得最小损耗解，从而最佳地导致贝塞尔 - 高斯光束叠加形成所需的形状光束。所得光束在相对较长的传播距离内保持其横向强度分布。
