High-frequency enhanced ultrafast compressed active photography
高频增强超快压缩主动摄影
高周波増強超高速圧縮能動撮影
고주파 강화 초고속 압축 능동 촬영
Fotografía activa de compresión ultrarápida mejorada de alta frecuencia
Haute fréquence améliorée ultra - rapide compression active photographie
Высокочастотная усовершенствованная ультрабыстрая сжатая активная фотография
Yizhao Meng ¹, Yu Lu ¹, Pengfei Zhang ¹, Yi Liu ¹, Fei Yin ², Lin Kai ¹, Qing Yang ², Feng Chen ¹
¹ State Key Laboratory for Manufacturing System Engineering and Shaanxi Key Laboratory of Photonics Technology for Information, School of Electronic Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China
中国 西安 西安交通大学电子与信息学部电子科学与工程学院 机械制造系统工程国家重点实验室 陕西省信息光子技术重点实验室
² School of Mechanical Engineering, Xi'an Jiaotong University, Xi’an 710049, China
中国 西安 西安交通大学机械工程学院
Single-shot ultrafast compressed imaging (UCI) is an effective tool for studying ultrafast dynamics in physics, chemistry, or material science because of its excellent high frame rate and large frame number. However, the random code (R-code) used in traditional UCI will lead to low-frequency noise covering high-frequency information due to its uneven sampling interval, which is a great challenge in the fidelity of large-frame reconstruction.
Here, a high-frequency enhanced compressed active photography (H-CAP) is proposed. By uniformizing the sampling interval of R-code, H-CAP capture the ultrafast process with a random uniform sampling mode. This sampling mode makes the high-frequency sampling energy dominant, which greatly suppresses the low-frequency noise blurring caused by R-code and achieves high-frequency information of image enhanced.
The superior dynamic performance and large-frame reconstruction ability of H-CAP are verified by imaging optical self-focusing effect and static object, respectively. We applied H-CAP to the spatial-temporal characterization of double-pulse induced silicon surface ablation dynamics, which is performed within 220 frames in a single-shot of 300 ps. H-CAP provides a high-fidelity imaging method for observing ultrafast unrepeatable dynamic processes with large frames.
