论文标题
单模式输出通过控制模式的飞秒多模纤维激光器中的时空非线性
Single mode output by controlling the spatiotemporal nonlinearities in mode-locked femtosecond multimode fiber lasers
论文作者
论文摘要
纤维模式锁定激光器的性能受到限制，这是由于单模纤维芯的空间限制引起的高非线性。为了大大增加飞秒脉冲的脉冲能，在振荡器之外获得扩增。最近，已提出时空模式锁定是通往纤维激光器的新途径。但是，光束质量要么是高脉冲能量和/或低脉冲能量。在这里，我们提出了一种直接在具有接近单模输出光束的模式的多模纤维振荡器中直接达到每个脉冲的高能的方法。我们的方法依赖于通过非线性KERR效应的空间自光束清洁，我们演示了具有M2 <1.13梁曲线的多模纤维振荡器，最多24 NJ Energe和低于100 FS压缩持续时间。报道的方法可以用较大的核心尺寸纤维进行进一步的功率扩展，并且可以使需要具有市售光纤的高功率超短激光器的应用。
The performance of fiber mode-locked lasers is limited due to the high nonlinearity induced by the spatial confinement of the single-mode fiber core. To massively increase the pulse energy of the femtosecond pulses, amplification is obtained outside the oscillator. Recently, spatiotemporal mode-locking has been proposed as a new path to fiber lasers. However, the beam quality was either highly multimode and/or with low pulse energy. Here we present an approach to reach high energy per pulse directly in the mode-locked multimode fiber oscillator with a near single-mode output beam. Our approach relies on spatial self-beam cleaning via the nonlinear Kerr effect and we demonstrate a multimode fiber oscillator with M2<1.13 beam profile, up to 24 nJ energy and sub-100 fs compressed duration. The reported approach is further power scalable with larger core sized fibers and could benefit applications that require high power ultrashort lasers with commercially available optical fibers.
