Goldberger David, Schmidt David, Barolak Jonathan, Ivanic Bojana, Durfee Charles G, Adams Daniel E
Opt Express. 2021 Sep 27;29(20):32474-32490. doi: 10.1364/OE.433752.
Ultrafast pulse-beam characterization is critical for diverse scientific and industrial applications from micromachining to generating the highest intensity laser pulses. The four-dimensional structure of a pulse-beam, ~(,,,), can be fully characterized by coupling spatiospectral metrology with spectral phase measurement. When temporal pulse dynamics are not of primary interest, spatiospectral characterization of a pulse-beam provides crucial information even without spectral phase. Here we demonstrate spatiospectral characterization of pulse-beams via multiplexed broadband ptychography. The complex spatial profiles of multiple spectral components, ~(,,), from modelocked Ti:sapphire and from extreme ultra-violet pulse-beams are reconstructed with minimum intervening optics and no refocusing. Critically, our technique does not require spectral filters, interferometers, or reference pulses.
超快脉冲光束表征对于从微加工到产生最高强度激光脉冲的各种科学和工业应用至关重要。脉冲光束的四维结构(,,, )可以通过将空间光谱计量与光谱相位测量相结合来全面表征。当时间脉冲动力学不是主要关注点时，即使没有光谱相位，脉冲光束的空间光谱表征也能提供关键信息。在此，我们通过多路复用宽带叠层成像展示了脉冲光束的空间光谱表征。利用最少的中间光学元件且无需重新聚焦，重建了来自锁模钛宝石和极紫外脉冲光束的多个光谱分量(,, )的复杂空间分布。至关重要的是，我们的技术不需要光谱滤波器、干涉仪或参考脉冲。
