CEP stabilized high power ultrashort pulse laser system

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的极短脉冲宽度才能对原子或分子过程（如化学反应或热化过程）进行时间分辨分析，或者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开辟了许多可能性。然而，对于这些所谓的少周期脉冲，仅基于包络的脉冲描述不再足够。由于电场和绝对相位（载波包络相位）对光-物质相互作用至关重要，因此将在耶拿的阿贝光子学中心安装一个载波包络相位（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。该系统将使几个研究小组能够进行不同的调查和应用。具体而言，将讨论以下主题：1。研究CEP和光谱以及时间脉冲特性对大面积共振纳米结构中的光致隧道效应、超快开关和非线性光学效应（如高效频率转换）的影响。这需要在NIR（约800 nm）中具有小于10 fs的脉冲长度的相位稳定的光脉冲。重复频率必须可调，从单次拍摄到至少50 kHz，以区分慢热和快速电子效应。2. CEP稳定、时间和光谱整形脉冲应用于控制气体和光催化系统中的化学反应。在激光系统中，产生额外的探测脉冲，其允许通过CARS光谱（汽车-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的定量分析。所有可能的中间体的检测需要大于4200 cm-1的泵浦脉冲的光谱宽度。时间同步探测脉冲在一个显着较短的波长（515 nm）具有小于10 cm-1的光谱宽度，这定义了测量的光谱分辨率。3.在二维材料中，应通过泵浦-探测实验对自由电荷载流子的时空动力学进行基础研究。这些系统的典型热化时间在所应用的系统的脉冲持续时间的范围内（约1000毫秒）。10fs）。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。

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.