scholarly journals Single-shot distributed temperature and strain tracking using direct detection phase-sensitive OTDR with chirped pulses

2016 ◽  
Vol 24 (12) ◽  
pp. 13121 ◽  
Author(s):  
J. Pastor-Graells ◽  
H. F. Martins ◽  
A. Garcia-Ruiz ◽  
S. Martin-Lopez ◽  
M. Gonzalez-Herraez
Keyword(s):  
Direct Detection ◽  
Single Shot ◽  
Chirped Pulses ◽  
Phase Sensitive

scholarly journals Picosecond-resolution phase-sensitive imaging of transparent objects in a single shot

2020 ◽  
Vol 6 (3) ◽  
pp. eaay6200 ◽  
Author(s):  
Taewoo Kim ◽  
Jinyang Liang ◽  
Liren Zhu ◽  
Lihong V. Wang
Keyword(s):  
Applied Sciences ◽  
Shock Wave ◽  
Dark Field ◽  
Single Shot ◽  
Contrast Imaging ◽  
Ultrafast Imaging ◽  
Dark Field Imaging ◽  
High Contrast Imaging ◽  
Transparent Objects ◽  
Phase Sensitive

With the growing interest in the optical imaging of ultrafast phenomena in transparent objects, from shock wave to neuronal action potentials, high contrast imaging at high frame rates has become desirable. While phase sensitivity provides the contrast, the frame rates and sequence depths are highly limited by the detectors. Here, we present phase-sensitive compressed ultrafast photography (pCUP) for single-shot real-time ultrafast imaging of transparent objects by combining the contrast of dark-field imaging with the speed and the sequence depth of CUP. By imaging the optical Kerr effect and shock wave propagation, we demonstrate that pCUP can image light-speed phase signals in a single shot with up to 350 frames captured at up to 1 trillion frames per second. We expect pCUP to be broadly used for a vast range of fundamental and applied sciences.

scholarly journals Generation and imaging of a tunable ultrafast intensity-rotating optical field with a cycle down to femtosecond region

2020 ◽  
Vol 8 ◽  
Author(s):  
Xuanke Zeng ◽  
Shuiqin Zheng ◽  
Yi Cai ◽  
Hongyu Wang ◽  
Xiaowei Lu ◽  
...  
Keyword(s):  
Repetition Rate ◽  
Rotational Symmetry ◽  
Michelson Interferometer ◽  
Optical Field ◽  
Frame Rate ◽  
Single Shot ◽  
Rotating Speed ◽  
Chirped Pulses ◽  
Laser Systems ◽  
The Difference

A tunable ultrafast intensity-rotating optical field is generated by overlapping a pair of 20 Hz, 800 nm chirped pulses with a Michelson interferometer (MI). Its rotating rate can be up to 10 trillion radians per second ( $\text{Trad}/\text{s}$ ), which can be flexibly tuned with a mirror in the MI. Besides, its fold rotational symmetry structure is also changeable by controlling the difference from the topological charges of the pulse pair. Experimentally, we have successfully developed a two-petal lattice with a tunable rotating speed from $3.9~\text{Trad}/\text{s}$ up to $11.9~\text{Trad}/\text{s}$ , which is confirmed by our single-shot ultrafast frame imager based on noncollinear optical-parametric amplification with its highest frame rate of 15 trillion frames per second (Tfps). This work is carried out at a low repetition rate. Therefore, it can be applied at relativistic, even ultrarelativistic, intensities, which usually operate in low repetition rate ultrashort and ultraintense laser systems. We believe that it may have application in laser-plasma-based accelerators, strong terahertz radiations and celestial phenomena.

scholarly journals Gaussian and Non-Gaussian operations on non-Gaussian state: engineering non-Gaussianity

2014 ◽  
Vol 2 (1) ◽  
Author(s):  
Stefano Olivares ◽  
Alessia Allevi ◽  
Maria Bondani
Keyword(s):  
Coherent State ◽  
Direct Detection ◽  
The State ◽  
Gaussian State ◽  
Classical State ◽  
Phase Sensitive ◽  
Photon Subtraction ◽  
Non Gaussian

AbstractMultiple photon subtraction applied to a displaced phase-averaged coherent state, which is a non-Gaussian classical state, produces conditional states with a non trivial (positive) Glauber-Sudarshan Prepresentation. We theoretically and experimentally demonstrate that, despite its simplicity, this class of conditional states cannot be fully characterized by direct detection of photon numbers. In particular, the non-Gaussianity of the state is a characteristics that must be assessed by phase-sensitive measurements. We also show that the non-Gaussianity of conditional states can be manipulated by choosing suitable conditioning values and composition of phase-averaged states.

scholarly journals Coherent convergent-beam time-resolved X-ray diffraction

2014 ◽  
Vol 369 (1647) ◽  
pp. 20130325 ◽  
Author(s):  
John C. H. Spence ◽  
Nadia A. Zatsepin ◽  
Chufeng Li
Keyword(s):  
Single Shot ◽  
Beam Diameter ◽  
X Ray Diffraction ◽  
Single Particles ◽  
Time Resolved ◽  
X Ray ◽  
Challenges And Opportunities ◽  
Phase Sensitive ◽  
Diffraction Patterns ◽  
Convergent Beam

The use of coherent X-ray lasers for structural biology allows the use of nanometre diameter X-ray beams with large beam divergence. Their application to the structure analysis of protein nanocrystals and single particles raises new challenges and opportunities. We discuss the form of these coherent convergent-beam (CCB) hard X-ray diffraction patterns and their potential use for time-resolved crystallography, normally achieved by Laue (polychromatic) diffraction, for which the monochromatic laser radiation of a free-electron X-ray laser is unsuitable. We discuss the possibility of obtaining single-shot, angle-integrated rocking curves from CCB patterns, and the dependence of the resulting patterns on the focused beam coordinate when the beam diameter is larger or smaller than a nanocrystal, or smaller than one unit cell. We show how structure factor phase information is provided at overlapping interfering orders and how a common phase origin between different shots may be obtained. Their use in refinement of the phase-sensitive intensity between overlapping orders is suggested.

scholarly journals Bracket states for communication protocols with coherent states

2014 ◽  
Vol 12 (02) ◽  
pp. 1461018 ◽  
Author(s):  
Alessia Allevi ◽  
Stefano Olivares ◽  
Maria Bondani
Keyword(s):  
Coherent States ◽  
Direct Detection ◽  
Photon Number ◽  
Fano Factor ◽  
Local Oscillator ◽  
Input State ◽  
Optical Elements ◽  
Symmetry Properties ◽  
Communication Scheme ◽  
Phase Sensitive

We present the generation and characterization of the class of bracket states, namely phase-sensitive mixtures of coherent states exhibiting symmetry properties in the phase-space description. A bracket state can be seen as the statistical ensemble arriving at a receiver in a typical coherent-state-based communication channel. We show that when a bracket state is mixed at a beam splitter with a local oscillator, both the emerging beams exhibit a Fano factor larger than 1 and dependent on the relative phase between the input state and the local oscillator. We discuss the possibility to exploit this dependence to monitor the phase difference for the enhancement of the performances of a simple communication scheme based on direct detection. Our experimental setup involves linear optical elements and a pair of photon-number-resolving detectors operated in the mesoscopic photon-number domain.

Single-shot spectral interferometry with chirped pulses

2001 ◽  
Vol 26 (20) ◽  
pp. 1612 ◽  
Author(s):  
J.-P. Geindre ◽  
P. Audebert ◽  
S. Rebibo ◽  
J.-C. Gauthier
Keyword(s):  
Single Shot ◽  
Spectral Interferometry ◽  
Chirped Pulses
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