Yang Chengshuai, Cao Fengyan, Qi Dalong, He Yilin, Ding Pengpeng, Yao Jiali, Jia Tianqing, Sun Zhenrong, Zhang Shian
State Key Laboratory of Precision Spectroscopy, School of Physics and Electronics Science, East China Normal University, Shanghai 200062, China.
Phys Rev Lett. 2020 Jan 17;124(2):023902. doi: 10.1103/PhysRevLett.124.023902.
The spatial, temporal, and spectral information in optical imaging play a crucial role in exploring the unknown world and unencrypting natural mysteries. However, the existing optical imaging techniques can only acquire the spatiotemporal or spatiospectral information of the object with the single-shot method. Here, we develop a hyperspectrally compressed ultrafast photography (HCUP) that can simultaneously record the spatial, temporal, and spectral information of the object. In our HCUP, the spatial resolution is 1.26 lp/mm in the horizontal direction and 1.41 lp/mm in the vertical direction, the temporal frame interval is 2 ps, and the spectral frame interval is 1.72 nm. Moreover, HCUP operates with receive-only and single-shot modes, and therefore it overcomes the technical limitation of active illumination and can measure the nonrepetitive or irreversible transient events. Using our HCUP, we successfully measure the spatiotemporal-spatiospectral intensity evolution of the chirped picosecond laser pulse and the photoluminescence dynamics. This Letter extends the optical imaging from three- to four-dimensional information, which has an important scientific significance in both fundamental research and applied science.
光学成像中的空间、时间和光谱信息在探索未知世界和揭开自然奥秘方面发挥着至关重要的作用。然而，现有的光学成像技术只能通过单次拍摄方法获取物体的时空或空间光谱信息。在此，我们开发了一种超光谱压缩超快摄影（HCUP）技术，它能够同时记录物体的空间、时间和光谱信息。在我们的HCUP中，水平方向的空间分辨率为1.26线对/毫米，垂直方向为1.41线对/毫米，时间帧间隔为2皮秒，光谱帧间隔为1.72纳米。此外，HCUP以仅接收和单次拍摄模式运行，因此它克服了主动照明的技术限制，能够测量非重复或不可逆的瞬态事件。利用我们的HCUP，我们成功测量了啁啾皮秒激光脉冲的时空-空间光谱强度演化以及光致发光动力学。本论文将光学成像从三维信息扩展到了四维信息，这在基础研究和应用科学中都具有重要的科学意义。
