Control systems for adaptive optical systems in high power laser resonators

高功率激光谐振腔自适应光学系统的控制系统

• 批准号: 257920601
• 负责人: Professor Dr. Thomas Graf
• 金额: --
• 依托单位: Institut für Systemdynamik (ISYS)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/257920601?language=en
• 关键词: Control; systems; adaptive; optical; power

The proposed research project aims at generalizing the existing concepts for continuous wave lasers towards a transversal beam shaping of mode-locked oscillators. For realizing a stable, pulsed laser beam, a coherent superposition of different longitudinal electromagnetic modes is necessary. In addition, nonlinear optical effects are needed – for instance by means of semiconductor saturable absorbers. This circumstance results in intensity-dependent set points. The proposed research project aims as compensating for these effects using intra-cavity deformable mirrors in order to enlarge the power-range of stable mode-locking. For achieving this goal, a model-based control design of the adaptive resonator is proposed. Thus, the complex and coupled dynamics of the mode-locked laser resonators has to be modeled in a transient way. Especially the dynamics of the optically addressed deformable mirror (OADM) give rise to advanced late lumping control approaches. Finally, the different actuator concepts – spherical pneumatic mirrors as well as an OADM – are combined in order to influence the (temporal) shape of the laser pulses. The chosen methods allow a deeper understanding of mode-locked lasers and aim a meeting the demand of compensation schemes in pulsed lasers.

拟议的研究项目旨在将现有的连续波激光器概念推广到锁模振荡器的横向光束整形。为了实现稳定的脉冲激光束，不同纵向电磁模式的相干叠加是必要的。此外，还需要非线性光学效应-例如通过半导体可饱和吸收体。这种情况导致强度相关的设定点。本研究计画旨在利用腔内可变形反射镜来补偿这些效应，以扩大稳定锁模的功率范围。为了实现这一目标，提出了一种基于模型的自适应谐振器的控制设计。因此，锁模激光器谐振腔的复杂和耦合的动力学必须以瞬态方式建模。特别是光寻址变形镜（OADM）的动力学特性引起了先进的后期集总控制方法。最后，将不同的致动器概念（球形气动镜以及OADM）结合起来，以影响激光脉冲的（时间）形状。所选的补偿方法使人们对锁模激光器有了更深入的了解，同时也满足了脉冲激光器补偿方案的要求。