Microaxicons for ultrashort wave packets II MAXWELL II

麦克斯韦二号项目正在开发压电或热驱动的非球面微镜阵列。我们将由柏林MAX-Born-Institute(MBI)的合作伙伴就它们在超短激光脉冲上的应用进行评估。基本元素是一个圆锥形结构--一个轴锥--这也导致了这个项目的名字。此外，还将研究螺旋形反射镜以及任意非球面和非对称形状在自适应光束整形方面的能力。在第一个项目阶段，麦克斯韦I，我们已经探索了这类器件的各种驱动和制造技术。在激光照射下，我们可以产生具有典型扩展焦区的自适应贝塞尔光束和具有变角轨道动量的空心光束。在麦克斯韦II中，这些概念将相应地小型化并使阵列兼容。这对于压电驱动来说尤其适用。到目前为止，热驱动的外部加热和冷却集成到系统中，以允许快速和单独地控制阵列的每个元素。为非传统的光学设置评估任意镜面形状(粗糙的、非对称的)的可能性和局限性研究也生产类似的透射式光学设备而不是纯粹的反射式光学设备的可能性。总共将开发、制造、评估和移交给MBI进行进一步分析的七个光学系统，其中至少四个在一个阵列中，并使用超短激光脉冲进行进一步分析。

Arrays of piezoelectrically or thermally actuated aspheric micro mirrors are being developed in the MAXWELL II project. They will be evaluated by our partners from the Max-Born-Institute (MBI) in Berlin with regard to their application on ultrashort laser pulses. The basic element is a conical structure -an axicon- which also led to the name of the project. In addition, spiral shaped mirrors and arbitrarily aspheric and non-symmetric shapes will also be investigated with view to their capabilities in adaptive beam shaping.In a first project phase, MAXWELL I, we have already explored diverse actuation and fabrication techniques for such devices. Illuminated with laser light we could generate adaptive Bessel beams with their typical extended focal zone as well as hollow beams with variable angular orbital momentum.In MAXWELL II these concepts shall beconsequently miniaturized and made array compatible. This holds especially true for the piezoelectric actuation.the so far external heating and cooling of the thermal actuation integrated into the system to allow for fast and individual control of each element of an array.the possibilities and limits of arbitrary mirror shapes (asperic, non-symmetric) evaluated for unconventional optical set-upsthe possibility of also producing similar transmissive optical devices instead of purely reflective ones investigated.In total, seven optical systems, at least four of which in an array, shall be developed, manufactured, evaluated and handed over to MBI for further analysis with ultrashort laser pulses.