CEP stabilized high power ultrashort pulse laser system

CEP稳定高功率超短脉冲激光系统

• 批准号: 506452342
• 金额: --
• 依托单位: Friedrich-Schiller-Universität Jena
• 依托单位国家: 德国
• 项目类别: Major Research Instrumentation
• 财政年份: 2022
• 资助国家: 德国
• 起止时间: 2021-12-31 至 无数据
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/506452342?language=en
• 关键词: CEP; stabilized; power; ultrashort; pulse

Ultra-short pulse lasers with pulse durations in the range of 100 fs are now established in many research laboratories and have become indispensable tools. However, only extremely short pulse durations of less than 10 fs allow the time-resolved analysis of atomic or molecular processes such as chemical reactions or thermalization processes or to influence them in a selective manner.This opens up numerous possibilities to study and control the interaction of ultrashort light pulses with nanostructures, molecules and even individual atoms. However, for these so-called few cycle pulses, a description of the pulses based only on the envelope is no longer sufficient. Instead, the electric field and the absolute phase (so-called carrier envelope phase - CEP) are crucial for the light-matter interaction.For this reason, a carrier envelope phase (CEP)-stabilized ultrashort pulse laser system will be installed at the Abbe Center of Photonics in Jena, providing both high pulse energies and high average powers as well as the possibility of temporal and spectral pulse shaping. The system will enable several research groups to perform different investigations and applications. In particular, the following topics will be addressed:1. Investigations on the influence of CEP and spectral as well as temporal pulse properties on photoinduced tunneling effects, ultrafast switching and nonlinear optical effects (such as efficient frequency conversion) in large area resonant nanostructures. This requires phase-stabilized light pulses in the NIR (about 800 nm) with a pulse length smaller than 10 fs. The repetition rate must be adjustable from single shot to at least 50 kHz to distinguish between slow thermal and fast electronic effects.2. The CEP stabilized, temporally and spectrally shaped pulses shall be used to control chemical reactions in gases and photocatalytic systems. In the laser system an additional probe pulse is generated that allows the temporally and spatially resolved quantitative analysis of reaction products by CARS-spectroscopy (CARS – coherent Anti-Stokes Raman Scattering). The detection of all possible intermediates requires a spectral width of the pump pulse greater than 4200 cm-1. The temporally synchronized probe pulse at a significant shorter wavelength (515 nm) has a spectral width smaller than 10 cm-1, which defines the spectral resolution of the measurement.3. In 2D-materials fundamental research on spatio-temporal dynamics of free charge carriers by means of pump-probe experiments shall be performed. Typical thermalization times of these systems are in the range of the pulse duration of the applied system (ca. 10fs). By varying the CEP, the correlation of the geometric symmetry of the structures with the temporal symmetry of the pulse will be investigated.

脉冲持续时间在 100 fs 范围内的超短脉冲激光器现已在许多研究实验室中建立，并已成为不可或缺的工具。然而，只有小于 10 fs 的极短脉冲持续时间才能对原子或分子过程进行时间分辨分析。例如化学反应或热化过程，或以选择性的方式影响它们。这为研究和控制超短光脉冲与纳米结构、分子甚至单个原子的相互作用提供了多种可能性。对于这些所谓的少周期脉冲，仅基于包络的脉冲描述已不再足够，相反，电场和绝对相位（所谓的载波包络相位 - CEP）对于光与物质的相互作用至关重要。为此，耶拿阿贝光子学中心将安装载波包络相位（CEP）稳定的超短脉冲激光系统，提供高脉冲能量和高平均功率，以及时间和光谱脉冲整形的可能性.系统将使多个研究小组能够进行不同的研究和应用，特别是以下主题：1.研究CEP和光谱以及时间脉冲特性对光致隧道效应、超快开关和非线性光学效应的影响。大面积共振纳米结构中的高效频率转换）需要脉冲长度小于 10 fs 的相位稳定光脉冲。至少 50 kHz，以区分慢速热效应和快速电子效应。2. 应使用 CEP 稳定的时间和光谱整形脉冲来控制气体和光催化系统中的化学反应。通过 CARS 光谱（CARS - 相干反斯托克斯拉曼散射）对反应产物进行时间和空间分辨定量分析 所有可能的中间体的检测需要泵浦脉冲的光谱宽度大于4200 cm-1。波长显着缩短（515 nm）的时间同步探测脉冲的光谱宽度小于 10 cm-1，这定义了测量的光谱分辨率。3。应通过泵浦探针实验进行自由电荷载流子的时间动力学，这些系统的典型热化时间在所应用系统的脉冲持续时间范围内（约 100 秒）。通过改变 CEP，将研究结构的几何对称性与脉冲的时间对称性的相关性。