近日，奥地利维也纳工业大学的Andrius Baltuška及其研究团队与瑞士保罗谢勒研究所的Xinhua Xie等人合作并取得一项新进展。经过不懈努力，他们利用放大飞秒脉冲爆发获得高光谱分辨率受激拉曼光谱。相关研究成果已于2024年2月29日在国际知名学术期刊《光：科学与应用》上发表。

该研究团队提出了一种新的受激拉曼散射(SRS)光谱方法，该方法通过使用放大的偏移相位控制的飞秒脉冲爆发，来实现高光谱分辨率和高速光谱采集。研究人员通过求解耦合非线性薛定谔方程来研究该方法，并通过将分子氮中的SRS作为模型化合物进行数值表征来验证该方法。研究发现，该方法的光谱分辨率由爆发内脉冲数与爆发间脉冲间隔的逆乘积共同决定。

通过无运动扫描偏移相位，SRS频谱得以轻松获取，这一过程伴随着拉曼位移频率的扫描。由于具备高光谱分辨率和快速无运动扫描的优势，这一技术为众多基于SRS的应用场景提供了新的可能性，如气体传感和化学分析等。

附：英文原文

Title: Hyper spectral resolution stimulated Raman spectroscopy with amplified fs pulse bursts

Author: Hu, Hongtao, Flry, Tobias, Stummer, Vinzenz, Pugzlys, Audrius, Zeiler, Markus, Xie, Xinhua, Zheltikov, Aleksei, Baltuska, Andrius

Issue&Volume: 2024-02-29

Abstract: We present a novel approach for Stimulated Raman Scattering (SRS) spectroscopy in which a hyper spectral resolution and high-speed spectral acquisition are achieved by employing amplified offset-phase controlled fs-pulse bursts. We investigate the method by solving the coupled non-linear Schrdinger equations and validate it by numerically characterizing SRS in molecular nitrogen as a model compound. The spectral resolution of the method is found to be determined by the inverse product of the number of pulses in the burst and the intraburst pulse separation. The SRS spectrum is obtained through a motion-free scanning of the offset phase that results in a sweep of the Raman-shift frequency. Due to high spectral resolution and fast motion-free scanning the technique is beneficial for a number SRS-based applications such as gas sensing and chemical analysis.

DOI: 10.1038/s41377-023-01367-0

Source: https://www.nature.com/articles/s41377-023-01367-0