Megahertz-rate shock-wave distortion cancellation via phase conjugate digital in-line holography.

摘要: Holography is a powerful tool for three-dimensional imaging. However, in explosive, supersonic, hypersonic, cavitating, or ionizing environments, shock-waves and density gradients impart phase distortions that obscure objects the field-of-view. Capturing time-resolved information these environments also requires ultra-high-speed acquisition. To reduce increase imaging rates, we introduce an conjugate digital in-line holography (PCDIH) technique. In this concept, coherent beam passes through shock-wave distortion, reflects off mirror, propagates back shock-wave, thereby minimizing from delays. By implementing method using pulse-burst laser setup at up to 5 million-frames-per-second, holograms of ultra-fast events are now possible. This technique applied holographic laser-spark plasma-generated enable tracking explosively generated hypersonic fragments. Simulations further advance our understanding physical processes experiments demonstrate PCDIH techniques capturing dynamics. Shock-waves supersonic Here, authors report where reflected thus correcting