Extension of time window into nanoseconds in single-shot ultrafast burst imaging by spectrally sweeping pulses

2020 ◽  
Vol 59 (17) ◽  
pp. 5210 ◽  
Author(s):  
Hirofumi Nemoto ◽  
Takakazu Suzuki ◽  
Fumihiko Kannari
Keyword(s):  
Time Window ◽  
Single Shot

scholarly journals A single‐shot autocorrelator for the ultraviolet with a variable time window

1990 ◽  
Vol 61 (3) ◽  
pp. 998-1003 ◽  
Author(s):  
S. Szatmári ◽  
F. P. Schäfer ◽  
J. Jethwa
Keyword(s):  
Time Window ◽  
Single Shot ◽  
Variable Time

scholarly journals Phase Diversity Electro-optic Sampling: A new approach to single-shot terahertz waveform recording

2022 ◽  
Vol 11 (1) ◽  
Author(s):  
Eléonore Roussel ◽  
Christophe Szwaj ◽  
Clément Evain ◽  
Bernd Steffen ◽  
Christopher Gerth ◽  
...  
Keyword(s):  
Time Window ◽  
Single Shot ◽  
Accelerator Physics ◽  
Sampling System ◽  
Conceptual Approach ◽  
Mathematical Concepts ◽  
Application Range ◽  
Phase Diversity ◽  
Electro Optic ◽  
Long Time

AbstractRecording electric field evolution in single-shot with THz bandwidth is needed in science including spectroscopy, plasmas, biology, chemistry, Free-Electron Lasers, accelerators, and material inspection. However, the potential application range depends on the possibility to achieve sub-picosecond resolution over a long time window, which is a largely open problem for single-shot techniques. To solve this problem, we present a new conceptual approach for the so-called spectral decoding technique, where a chirped laser pulse interacts with a THz signal in a Pockels crystal, and is analyzed using a grating optical spectrum analyzer. By borrowing mathematical concepts from photonic time stretch theory and radio-frequency communication, we deduce a novel dual-output electro-optic sampling system, for which the input THz signal can be numerically retrieved—with unprecedented resolution—using the so-called phase diversity technique. We show numerically and experimentally that this approach enables the recording of THz waveforms in single-shot over much longer durations and/or higher bandwidth than previous spectral decoding techniques. We present and test the proposed DEOS (Diversity Electro-Optic Sampling) design for recording 1.5 THz bandwidth THz pulses, over 20 ps duration, in single-shot. Then we demonstrate the potential of DEOS in accelerator physics by recording, in two successive shots, the shape of 200 fs RMS relativistic electron bunches at European X-FEL, over 10 ps recording windows. The designs presented here can be used directly for accelerator diagnostics, characterization of THz sources, and single-shot Time-Domain Spectroscopy.

scholarly journals A single-shot third-order autocorrelator for pulse contrast and pulse shape measurements

2001 ◽  
Vol 19 (2) ◽  
pp. 231-235 ◽  
Author(s):  
J. COLLIER ◽  
C. HERNANDEZ-GOMEZ ◽  
R. ALLOTT ◽  
C. DANSON ◽  
A. HALL
Keyword(s):  
Pulse Shape ◽  
Optical Pulse ◽  
Dynamic Range ◽  
Time Window ◽  
Ultrashort Pulses ◽  
Fixed Time ◽  
Second Order ◽  
Single Shot ◽  
Third Order ◽  
Pulse Contrast

We present the design of a single-shot third-order autocorrelator that can be used to measure optical pulse lengths of ultrashort pulses within a fixed time window on a single-shot basis. It has a number of advantages over traditional second-order autocorrelation devices, namely a more direct and accurate measurement of pulse shape, the ability to differentiate temporal activity ahead and behind the pulse, and an increased dynamic range. The design is linear and is, in principle, no more difficult to construct and operate than a second-order autocorrelator.

Feel Thine Own Self – Mood Congruency Evaluation of Emotional State Adjectives

2020 ◽  
pp. 1-17
Author(s):  
Szczepan J. Grzybowski ◽  
Miroslaw Wyczesany ◽  
Jan Kaiser
Keyword(s):  
Mood Induction ◽  
Semantic Analysis ◽  
Emotional State ◽  
Time Window ◽  
Event Related Potential ◽  
Negativity Bias ◽  
Positive Potential ◽  
Semantic Access ◽  
Current Mood ◽  
Component Time

Abstract. The goal of the study was to explore event-related potential (ERP) differences during the processing of emotional adjectives that were evaluated as congruent or incongruent with the current mood. We hypothesized that the first effects of congruence evaluation would be evidenced during the earliest stages of semantic analysis. Sixty mood adjectives were presented separately for 1,000 ms each during two sessions of mood induction. After each presentation, participants evaluated to what extent the word described their mood. The results pointed to incongruence marking of adjective’s meaning with current mood during early attention orientation and semantic access stages (the P150 component time window). This was followed by enhanced processing of congruent words at later stages. As a secondary goal the study also explored word valence effects and their relation to congruence evaluation. In this regard, no significant effects were observed on the ERPs; however, a negativity bias (enhanced responses to negative adjectives) was noted on the behavioral data (RTs), which could correspond to the small differences traced on the late positive potential.

Time Window from Visual Images to Visual Short-Term Memory: Consolidation or Integration?

2004 ◽  
Vol 51 (1) ◽  
pp. 45-51 ◽  
Author(s):  
Yuhong Jiang
Keyword(s):  
Short Term Memory ◽  
Time Window ◽  
Short Interval ◽  
Visual Images ◽  
Short Term ◽  
Temporal Window ◽  
Term Memory ◽  
Visual Short Term Memory ◽  
Probe Task ◽  
Long Time

Abstract. When two dot arrays are briefly presented, separated by a short interval of time, visual short-term memory of the first array is disrupted if the interval between arrays is shorter than 1300-1500 ms ( Brockmole, Wang, & Irwin, 2002 ). Here we investigated whether such a time window was triggered by the necessity to integrate arrays. Using a probe task we removed the need for integration but retained the requirement to represent the images. We found that a long time window was needed for performance to reach asymptote even when integration across images was not required. Furthermore, such window was lengthened if subjects had to remember the locations of the second array, but not if they only conducted a visual search among it. We suggest that a temporal window is required for consolidation of the first array, which is vulnerable to disruption by subsequent images that also need to be memorized.

Analysis on Time Window of Shared Parking in Hospitals Based on Parking Behaviors

CICTP 2017 ◽  
2018 ◽  
Author(s):  
Qin Chen ◽  
Peng He ◽  
Jun Chen ◽  
Qi Yang
Keyword(s):  
Time Window
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