Mauclair C, Cheng G, Huot N, Audouard E, Rosenfeld A, Hertel I V, Stoian R
Laboratoire Hubert Curien, UMR 5516 CNRS, Université Jean Monnet, 42000 Saint Etienne, France.
Opt Express. 2009 Mar 2;17(5):3531-42. doi: 10.1364/oe.17.003531.
Femtosecond laser processing of bulk transparent materials can generate localized positive changes of the refractive index. Thus, by translation of the laser spot, light-guiding structures are achievable in three dimensions. Increasing the number of laser processing spots can consequently reduce the machining effort. In this paper, we report on a procedure of dynamic ultrafast laser beam spatial tailoring for parallel photoinscription of photonic functions. Multispot operation is achieved by spatially modulating the wavefront of the beam with a time-evolutive periodical binary phase mask. The parallel longitudinal writing of multiple waveguides is demonstrated in fused silica. Using this technique, light dividers in three dimensions and wavelength-division demultiplexing (WDD) devices relying on evanescent wave coupling are demonstrated.
飞秒激光对块状透明材料进行加工能够产生折射率的局部正向变化。因此，通过移动激光光斑，可在三维空间中实现光导结构。增加激光加工光斑的数量可相应减少加工工作量。在本文中，我们报道了一种用于光子功能并行光写入的动态超快激光束空间整形方法。通过使用具有时间演化周期性二元相位掩模对光束波前进行空间调制来实现多光斑操作。在熔融石英中演示了多个波导的并行纵向写入。利用该技术，展示了三维光分路器以及基于倏逝波耦合的波分复用（WDD）器件。
