High power mode comb from a non-collinear optic parametric oscillator

非共线光学参量振荡器的高功率模式梳

• 批准号: 206327953
• 负责人: Professor Dr. Uwe Morgner
• 金额: --
• 依托单位: Institut für Quantenoptik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/206327953?language=en
• 关键词: power; mode; comb; non; collinear

For decades optic parametric oscillators (OPOs) are well known for producing femtosecond pulses with narrow bandwidth, acceptable average output powers, and wide tunability. In this project, we will explore novel concepts to access the few‐cycle pulse duration regime for the first time. Non‐collinear pumping geometry allows for ultra broadband gain bandwidth (we then call it NOPO). Adding a Kerr‐based fast saturable absorber in a second focus in combination with double‐chirped mirror based broadband dispersion management gives rise to the first few‐cycle pulses from an OPO. The main challenge will be the control of the intracavity pulse shaping dynamics to keep the ultrabroad spectrum in a long pulse for maximum gain extraction; our approach is based on ideas well elaborated in the context of fiber oscillators. In contrast to comparable laser oscillators, here the output power is only limited by the power of the pump laser due to the absence of thermal lensing effects. By pumping with a home‐built thin‐disk based femtosecond high power laser, we will approach the multi‐Watt level of average output power. The stable pulse train from the NOPO forms a broadband mode comb, which will be subject of in‐depth investigations regarding its coherence properties and timing jitter respectively. This very new concept for high power mode combs allows for efficient frequency conversion into remote wavelength regions, especially the near UV.

几十年来，光学参量振荡器 (OPO) 因产生具有窄带宽、可接受的平均输出功率和宽可调性的飞秒脉冲而闻名。在这个项目中，我们将首次探索新颖的概念来访问少周期脉冲持续时间范围。非共线泵浦几何结构可实现超宽带增益带宽（我们称之为 NOPO），并在第二个焦点中添加基于克尔的快速饱和吸收器，并与基于宽带的双啁啾镜相结合。色散管理产生了 OPO 的前几个周期脉冲，主要挑战是控制腔内脉冲整形动力学，以将超宽频谱保持在长脉冲中，以实现最大增益提取；与光纤振荡器相比，由于不存在热透镜效应，因此输出功率仅受泵浦激光器功率的限制。基于飞秒高功率激光器，我们将接近数瓦级别的平均输出功率，NOPO 的稳定脉冲序列形成宽带模式梳，将分别对其相干特性和定时抖动进行深入研究。这种高功率模式梳的全新概念可以有效地将频率转换到远程波长区域，尤其是近紫外区域。