Vogel Tim, Mansourzadeh Samira, Saraceno Clara J
Opt Lett. 2024 Aug 15;49(16):4517-4520. doi: 10.1364/OL.532219.
We present the highest, to the best of our knowledge, average power from a laser-driven single-cycle THz source demonstrated so far, using optical rectification in the tilted pulse front geometry in cryogenically cooled lithium niobate, pumped by a commercially available 500 W ultrafast thin-disk ytterbium (Yb) amplifier. We study repetition rate-dependent effects in our setup at 100 and 40 kHz at this high average power, revealing different optimal fluence conditions for efficient conversion. The demonstrated sources with multi-100 mW average power at these high repetition rates combine high THz pulse energies and high repetition rate and are thus ideally suited for nonlinear THz spectroscopy experiments with significantly reduced measurement times. The presented result is a first benchmark for high average power THz time-domain spectroscopy systems for nonlinear spectroscopy, driven by very high average power ultrafast Yb lasers.
据我们所知，我们展示了迄今为止由激光驱动的单周期太赫兹源产生的最高平均功率。该源采用倾斜脉冲前沿几何结构中的光整流技术，在低温冷却的铌酸锂中实现，由市售的500 W超快薄片镱（Yb）放大器泵浦。我们在这个高平均功率下，研究了在100 kHz和40 kHz重复频率下装置中重复频率相关的效应，揭示了高效转换的不同最佳能量密度条件。在这些高重复频率下展示的具有多100 mW平均功率的源，结合了高太赫兹脉冲能量和高重复频率，因此非常适合用于显著减少测量时间的非线性太赫兹光谱实验。所呈现的结果是由非常高平均功率的超快Yb激光器驱动的用于非线性光谱的高平均功率太赫兹时域光谱系统的首个基准。
