Single-shot real-time video recording of a photonic Mach cone induced by a scattered light pulse

Abstract

Lossless-encoding compressed ultrafast photography captures a movie of a photonic Mach cone at 100 billion frames per second.

Ultrafast imaging of light scattering dynamics using second-generation compressed ultrafast photography

“…The cone edge is seen as two light tails extending from the tip of the propagating laser pulse in the source tunnel, forming a V-shaped wedge. The semivertex angle, directly measured in these temporal frames, is ~45 degrees, which agrees with the theoretical value [38]. It is worth noting that the video-recorded light pattern shows an asymmetric spatial intensity distribution, which is probably attributable to unequal couplings of the non-uniform scattering in the source tunnel to the upper and lower display panels.…”

Compressed 3D Image Information and Communication Security

“…Now, the maximum imaging speed of CCD or CMOS technology can be up to 10 7 frames per second . However, if the dynamical event occurs in the range of nanoseconds or picoseconds, the compressed ultrafast photography (CUP) technique can provide a suitable method to simultaneously measure, encrypt, and compress the transient scene, where the image encryption and data compression are performed in the optical measurement, which differs from the previously mentioned method by the computer. So far, the CUP technique can capture a time‐evolving transient event at a rate of 10 11 frames per second.…”

Optimizing codes for compressed ultrafast photography by the genetic algorithm

“…In the traditional method, the optimal codes are based on the smallest mutual coherence between the representing and measurement matrices [9][10][11][12], which should be a normal 2D matrix. However, in some applications, such as in a snapshot spectral imager [15] or in CUP [4,7], the measurement matrix is pseudo. Therefore, it cannot be expressed as a normal 2D matrix.…”

“…Similar to traditional photography, the CUP technique is receive-only and does not need specialized active illumination, which is different from some previous ultrafast imaging techniques, such as sequentially timed all-optical mapping photography [5] or serial timeencoded amplified imaging [6]. By now, the CUP technique has been successfully applied to measure some fundamental ultrafast optical phenomena [4,7], such as laser pulse reflection and refraction, photon racing in two media, and photonic Mach cone. In addition, the CUP technique has also been further extended and was successfully used for dynamic volumetric imaging x; y; z by leveraging the time-of-fight information [8] and color ultrafast imaging x; y; t; λ by using a dichroic mirror to separate the signals into two color channels [4].…”