Single-shot, space- and time-resolved measurement of rotational wavepacket revivals in H<inf>2</inf> and D<inf>2</inf>
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Femtosecond laser induced alignment and periodic recurrences of room temperature hydrogen and deuterium molecules are measured in a single shot for the first time, using single-shot supercontinuum spectral interferometry (SSSI). The measurements are also performed in oxygen and some other common linear molecular gases. Employing time-dependent first order perturbation theory, an analytical model of rotational wavepacket revivals is derived, which shows good agreement with the experiment.Keywords:
Supercontinuum
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Tomography of single-particle-resolved detectors is of primary importance for characterizing particle correlations with applications in quantum metrology, quantum simulation and quantum computing. However, it is a non-trivial task in practice due to the unavoidable presence of noise that affects the measurement but does not originate from the detector. In this work, we address this problem for a three-dimensional single-atom-resolved detector where shot-to-shot atom number fluctuations are a central issue to perform a quantum detector tomography. We overcome this difficulty by exploiting the parallel measurement of counting statistics in sub-volumes of the detector, from which we evaluate the effect of shot-to-shot fluctuations and perform a local tomography of the detector. In addition, we illustrate the validity of our method from applying it to Gaussian quantum states with different number statistics. Finally, we show that the response of Micro-Channel Plate detectors is well-described from using a binomial distribution with the detection efficiency as a single parameter.
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Experimental and theoretical comparison of supercontinuum generation for femtosecond and nanosecond pulses with similar peak power level in the same nonlinear media was provided. In the case of femtosecond pumping, we observed a number of peaks and in the case of nanosecond pulses, we observed a continuous spectrum.
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On-axis single shot digital holography using polarization based two sensing channels is described. This study proposes a novel on-axis single shot method that can provide the same reconstruction quality as on-axis multiple shot scheme.
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We propose the novel single shot phase retrieval method using machine learning algorithm for reflective digital holographic microscopy. The feasibility of this method is verified through experiments with fingerprint specimens.
Digital Holographic Microscopy
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A simple and effective single-shot pump-probe technique is reported. Using only two commercial gratings, a large time window of ~ 95.58 ps is spatially encoded in a single probe pulse, and single-shot time-resolved measurements are implemented. The time window exceeds the maximum reported values for single-shot pump-probe techniques using the echelon or angle beam encoding strategy. The phase difference problem in the echelon encoding strategies is also eliminated and a customized echelon is not needed in this technique. The measurements of the ultrafast dynamics of ZnSe at a wavelength of 650 nm verify the effectiveness of this technique.
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Recently two-stage detectors have surged ahead of single-shot detectors in the accuracy-vs-speed trade-off. Nevertheless single-shot detectors are immensely popular in embedded vision applications. This paper brings single-shot detectors up to the same level as current two-stage techniques. We do this by improving training for the state-of-the-art single-shot detector, RetinaNet, in three ways: integrating instance mask prediction for the first time, making the loss function adaptive and more stable, and including additional hard examples in training. We call the resulting augmented network RetinaMask. The detection component of RetinaMask has the same computational cost as the original RetinaNet, but is more accurate. COCO test-dev results are up to 41.4 mAP for RetinaMask-101 vs 39.1mAP for RetinaNet-101, while the runtime is the same during evaluation. Adding Group Normalization increases the performance of RetinaMask-101 to 41.7 mAP. Code is at:https://github.com/chengyangfu/retinamask
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We describe a method for acquiring a three-dimensional shape and its texture using a singe-shot active stereo imaging with randomly structured illumination from a projector based on compressive sensing [1]. The principle and its experimental demonstration are presented.
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