Johnson Allan S, Amuah Emmanuel B, Brahms Christian, Wall Simon
ICFO - The Institute of Photonics Sciences, The Barcelona Institute of Science and Technology, 08860, Castelldefels, Barcelona, Spain.
School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, EH14 4AS, UK.
Sci Rep. 2020 Mar 13;10(1):4690. doi: 10.1038/s41598-020-61620-z.
Tuneable ultrafast laser pulses are a powerful tool for measuring difficult-to-access degrees of freedom in materials science. In general these experiments require the ability to address resonances and excitations both above and below the bandgap of materials, and to probe their response at the timescale of the fastest non-trivial internal dynamics. This drives the need for ultrafast sources capable of delivering 10-15 fs duration pulses tuneable across the entire visible (VIS) and near infrared (NIR) range, 500- 3000 nm, as well as the characterization of these sources. Here we present a single frequency-resolved optical gating (FROG) system capable of self-referenced characterization of pulses with 10 fs duration across the entire VIS-NIR spectral range. Our system does not require auxiliary beams and only minor reconfiguration for different wavelengths. We demonstrate the system with measurements of pulses across the entire tuning range.
可调谐超快激光脉冲是材料科学中测量难以获取的自由度的有力工具。一般来说，这些实验需要能够激发材料带隙上下的共振和激发，并在最快的非平凡内部动力学时间尺度上探测其响应。这就推动了对能够产生持续时间为10 - 15飞秒、在整个可见光（VIS）和近红外（NIR）范围（500 - 3000纳米）内可调谐的超快光源的需求，以及对这些光源的表征。在此，我们展示了一种单频分辨光学门控（FROG）系统，该系统能够在整个VIS - NIR光谱范围内对持续时间为10飞秒的脉冲进行自参考表征。我们的系统不需要辅助光束，并且针对不同波长仅需进行少量重新配置。我们通过对整个调谐范围内的脉冲进行测量来演示该系统。
