Femtosecond kHz laser/amplifier system with optical parametric amplifier (OPA), pumped through the main unit and usable only through this.

“超快光谱与生物物理学”工作组的研究方向为凝聚态快、超快分子动力学。我们对生物相关分子和相应的模型系统以及金属配体配合物中的反应性和非反应性光诱导过程特别感兴趣。在分子水平上理解电子激发后基质结合发色团在皮秒和亚皮秒时间尺度上的竞争失活过程，是在生物医学（荧光标记、光遗传学）和技术领域（催化、发光、磁性）等应用中使用基于此的反应和过程机制的基础。为了在飞秒时间范围内研究高时间分辨率的光致初级过程，应用并进一步发展了超快“泵浦/探针”激光光谱学方法。其中包括用于记录电子动力学的可见光和邻近光谱范围内的时间分辨吸收光谱，用于记录超快振动和结构动力学的中红外时间分辨吸收光谱，以及用于描述固体样品中电子动力学的可见光谱范围内的时间分辨反射率光谱。作为一种补充方法，上述红外光谱法是必不可少的。因此，本应用程序的目标是采购飞秒千赫兹激光/放大器系统与光学参量放大器作为旧设备的替代品。获得可用测量结果所需的总时间现在增加了约2-5倍，并且绝对不再合理。这种装置在任何方面都不再符合目前能够取得具有国际竞争力的科学成果的仪器技术标准。这样做的后果之一是，我们在DFG合作研究中心、DFG研究基金和莱茵兰-普法尔茨州研究中心的框架内进行的红外光谱测量目前无法再以期望和所需的强度进行。工作组正在进行的和计划中的科学项目需要能够调谐到宽光谱范围（紫外-近红外）的激发脉冲，具有足够大的脉冲能量，特别是在紫外范围。为此，提出了一种用于飞秒千赫兹激光/放大系统的光参量放大器，该光参量放大器被抽运通过放大系统并且只能通过它使用。

The research of the working group "Ultrafast spectroscopy and biophysics" lies in the field of fast and ultrafast molecular dynamics in condensed phase. We are particularly interested in reactive and non-reactive photoinduced processes in biologically relevant molecules and corresponding model systems, as well as in metal-ligand complexes. The understanding of the competing deactivation processes of a matrix-bound chromophore on the pico- and sub-picosecond time scale after electronic excitation on the molecular level is the basis for the use of the reaction and process mechanisms based on this for applications e.g. in biological-medical (fluorescence markers, optogenetics) and in technical fields (catalysis, luminescence, magnetism).Ultrafast methods of "pump/probe" laser spectroscopy are applied and further developed in order to investigate the light-induced primary processes with high time-resolution into the femtosecond time-range. These include time-resolved absorption spectroscopy in the visible and adjacent spectral ranges for recording electronic dynamics, time-resolved absorption spectroscopy in the mid-infrared for recording ultrafast vibrational and structural dynamics and time-resolved reflectivity spectroscopy in the visible spectral range for describing electronic dynamics in solid samples. As a complementary method, the mentioned infrared spectroscopy is indispensable. Therefore, the object of this application is the procurement of a femtosecond kilohertz laser/amplifier system with an optical parametric amplifier as a replacement for an old device. The total time required to obtain usable measurement results has now increased by a factor of about 2-5 and is absolutely no longer justifiable. The device no longer corresponds in any way to the current standard of apparatus technology with which internationally competitive scientific results could be achieved. One of the consequences of this is that our infrared-spectroscopic measurements within the framework of the DFG Collaborative Research Centre, DFG Research Grant and Research Centre of the State of Rhineland-Palatinate can currently no longer be carried out with the desired and required intensity. The ongoing and planned scientific projects of the working group require excitation pulses that can be tuned to a wide spectral range (ultraviolet - near infrared), with sufficiently large pulse energy, especially in the ultraviolet range. Therefore, an optical parametric amplifier is proposed for the femtosecond kilohertz laser/amplifier system, which is pumped through the amplifier system and can only be used through it.