1,974 Hits in 3.4 sec

Compressive inverse scattering using ultrashort pulses

Kyung Hwan Jin, Kanghee Lee, Jaewook Ahn, Jong Chul Ye, Charles A. Bouman, Ilya Pollak, Patrick J. Wolfe
2010 Computational Imaging VIII  
The main contribution of this paper is, therefore, to analyze the wideband inverse scattering problem from compressive sensing perspective.  ...  Two distinct imaging strategies have been commonly used: narrow band inverse scattering approaches using a large number of transmitters and receivers, or wideband imaging approaches with smaller number  ...  Narrow band inverse scattering approach has been recently analyzed from compressive sensing perspective, 10, 11 which demonstrates that sparse objects can be reconstructed significantly well using smaller  ... 
doi:10.1117/12.849068 dblp:conf/cimaging/JinLAY10 fatcat:opsif5ot55dujeyt3fots6lx6u


Sun K. Hong, Emily Lathrop, Victor M. Mendez, Jerry Kim
2015 Electromagnetic Waves  
The long duration input pulse into the cavity is created using time-reversal techniques, which allows the waveform to contain the inverse profile of the cavity phase distortion.  ...  When fed back into the cavity, the wave focusing at the output port results in a compressed ultrashort pulse with enhanced peak amplitude.  ...  A passive approach is to use a dispersive waveguide structure, where an input pulse containing the inverse dispersion profile is compressed into a short pulse with enhanced peak power as a result of the  ... 
doi:10.2528/pier15092406 fatcat:daz2j3qkvbazff2wsqi7deivue

Spatiotemporal Coherent Control of Light through a Multiple Scattering Medium with the Multispectral Transmission Matrix

Mickael Mounaix, Daria Andreoli, Hugo Defienne, Giorgio Volpe, Ori Katz, Samuel Grésillon, Sylvain Gigan
2016 Physical Review Letters  
Using a single spatial light modulator, our approach enables the full control of both spatial and spectral properties of an ultrashort pulse transmitted through the medium.  ...  We report broadband characterization of the propagation of light through a multiply scattering medium by means of its Multi-Spectral Transmission Matrix.  ...  This approach allows the temporal compression of an ultrashort pulse at a given position by iteratively optimizing the input wave front [26] [27] [28] , or alternatively by using digital phase conjugation  ... 
doi:10.1103/physrevlett.116.253901 pmid:27391722 fatcat:y5cnmolhunenrdelkjmxpt3aqq

Propagation Technique for Ultrashort Pulses II: Numerical Methods to Solve the Pulse Propagation Equation

Cao Long Van, Hung Nguyen Viet, Marek Trippenbach, Khoa Dinh Xuan
2008 Computational Methods in Science and Technology  
We also numerically investigate an important technique to create ultrashort pulses, which is known as the pulse compression.  ...  It is based on high order soliton propagation in Kerr media when the effect of stimulated Raman scattering is taken into account.  ...  Under the influence of this effect the pulse is time compressed and its width decreases to a lower value. This phenomenon is used in practice in creating the ultrashort pulses.  ... 
doi:10.12921/cmst.2008.14.01.13-19 fatcat:zjkqwofmtngzfatq4s64a2fdim

Page 265 of Applied Physics. A and B Vol. B58, Issue 3 [page]

1994 Applied Physics. A and B  
One synchrotron-based approach would use a rapidly- rotating grazing-incidence mirror and a diffraction grat- ing to compress X-ray pulses by a factor of ~100 [58].  ...  For example, a short, intense laser pulse can be used to ionize a gas to create a cold plasma. Recombination in this plasma can result in population inversion [7].  ... 

Volume-chirped Bragg gratings: monolithic components for stretching and compression of ultrashort laser pulses

Leonid Glebov, Vadim Smirnov, Eugeniu Rotari, Ion Cohanoschi, Larissa Glebova, Oleg Smolski, Julien Lumeau, Christopher Lantigua, Alexei Glebov
2014 Optical Engineering: The Journal of SPIE  
pulses.  ...  CBGs recorded in photo-thermo-refractive glass can be used in the spectral range from 0.8 to 2.5 μm with the diffraction efficiency exceeding 90%, and provide stretching up to 1 ns and compression down  ...  In this technique, low-power ultrashort pulses are stretched ("chirped") in time and space using dispersive optical elements.  ... 
doi:10.1117/1.oe.53.5.051514 fatcat:7bzqbkb7ozgkfgwbi5lnjqmioq

Achieving 50 femtosecond resolution in MeV ultrafast electron diffraction with a double bend achromat compressor [article]

Fengfeng Qi, Zhuoran Ma, Lingrong Zhao, Yun Cheng, Wenxiang Jiang, Chao Lu, Tao Jiang, Dong Qian, Zhe Wang, Wentao Zhang, Pengfei Zhu, Xiao Zou, Weishi Wan, Dao Xiang (+1 others)
2020 arXiv   pre-print
Such an ultrashort and ultrastable electron beam allows us to achieve 50 femtosecond (FWHM) resolution in MeV ultrafast electron diffraction where lattice oscillation at 2.6 THz corresponding to Bismuth  ...  We propose and demonstrate a novel scheme to produce ultrashort and ultrastable MeV electron beam.  ...  In addition to MeV UED, ultrashort and ultrastable electron beam is also essential for external injection in plasma acceleration, THz-driven acceleration, inverse Compton scattering x-ray source, etc.  ... 
arXiv:2003.08046v1 fatcat:rzmmkfu35baolcvzouyhy2d5lm

Single-shot real-time femtosecond imaging of temporal focusing

Jinyang Liang, Liren Zhu, Lihong V. Wang
2018 Light: Science & Applications  
laser pulse in a dynamic scattering medium.  ...  As the only currently available real-time, passive imaging modality with a femtosecond exposure time, T-CUP was used to record the first-ever movie of non-repeatable temporal focusing of a single ultrashort  ...  To solve this problem, compressed sensing is used.  ... 
doi:10.1038/s41377-018-0044-7 pmid:30839588 pmcid:PMC6107054 fatcat:z2hkkapco5ekbk3wbh6zxmmj6m

Ultrashort Pulses [chapter]

Mikhail N., Marcus Babzie
2012 CO2 Laser - Optimisation and Application  
Acknowledgements This work is supported by the US DOE contract DE-AC02-98CH10886 and by the BNL Laboratory Directed R&D (LDRD) grant #07-004.  ...  be possible to employ these phenomena to further compress ultrashort pulses.  ...  In a typical CO 2 laser, an electric discharge is used to create population inversion.  ... 
doi:10.5772/37648 fatcat:ttyko2c3jnd27oy3vye6hufaky

Non-equilibrium ultrashort pulse generation strategies in VECSELs

I. Kilen, S. W. Koch, J. Hader, J. V. Moloney
2017 Optica  
The classical laser gain picture fails, however, when a high peak intensity optical pulse of duration shorter than the intrinsic carrier scattering time interacts with electrons in the conduction and holes  ...  We present the optimization of ultrashort mode-locked pulses in a vertical external cavity surface emitting laser cavity with a saturable absorber mirror by modelling non-equilibrium quantum dynamics of  ...  Among these is a train of 60 fs pulses under a picosecond envelope [3] and single 107 fs pulses that were externally compressed down to 96 fs [15] .  ... 
doi:10.1364/optica.4.000412 fatcat:xejiaxz4uvh4fguq2pq4z2azrm

Remote characterization and dispersion compensation of amplified shaped femtosecond pulses using MIIPS

I. Pastirk, X. Zhu, R. M. Martin, M. Dantus
2006 Optics Express  
We report on the remote characterization and dispersion compensation (pulse compression) of femtosecond pluses using multiphoton intrapulse interference phase scan (MIIPS).  ...  We consider this method for remote characterization and dispersion compensation to be an important step towards the development of reliable applications requiring the propagation of ultrashort pulses to  ...  Once φ(ω) is known, the pulses are automatically corrected by applying the inverse of φ(ω) using the shaper. Typically, the first iteration yields compressed pulses within 20% of the transform limit.  ... 
doi:10.1364/oe.14.008885 pmid:19529268 fatcat:a5dnceqapfffzbhojqr3bd2rhi

Influence of Self-steepening and Higher Dispersion Effects on the Propagation Characteristics of Solitons in Optical Fibers

T. Do Thanh, T.V. Nguyen, D.T. Bui, V. Cao Long
2016 Computational Methods in Science and Technology  
Moreover, we can use third order dispersion to compress pulses as well as changing the frequency.  ...  In this work we use the generalized nonlinear Schrödinger equation to study propagation of ultrashort optical pulses in the presence of Raman scattering and third -order dispersion effects.  ...  However, we can use this phenomenon to compress pulses as well as change the frequency. ∂U ∂ ξ = 1 6 ∂ 3 U ∂ τ 3 + iN |U | 2 U. (8) IV.  ... 
doi:10.12921/cmst.2016.0000063 fatcat:wgrvlddchnabnal7oper7zxafe

Sensitivity of SHG-FROG for the characterization of ultrahigh-repetition-rate telecommunication laser sources

Julien Fatome, Stéphane Pitois, Guy Millot
2004 Optical fiber technology (Print)  
Using a commercially-available optical spectrum analyzer in the SHG-FROG setup, incident pulses with energies of only 125fJ and 190fJ, which correspond to the beat signal and the 1.3ps pulse train, respectively  ...  the sensitivity of second-harmonic generation frequencyresolved optical gating (SHG-FROG) for the complete intensity and phase characterization of both a sinusoidal beat signal and a train of 1.3 ps pulses  ...  Let us remark that the intensity and phase profiles show compressed pulses without pedestal or chirp.  ... 
doi:10.1016/j.yofte.2003.08.001 fatcat:zvxb5m3k2jfo5pwpznalsx5voq

Transmission matrix approaches for nonlinear fluorescence excitation through multiple scattering media

Mickael Mounaix, Duc Minh Ta, Sylvain Gigan
2018 Optics Letters  
Several matrix approaches were developed to control light propagation through multiple scattering media under illumination of ultrashort pulses of light.  ...  We then demonstrate point-scanning imaging of such fluorescent microbeads located after a thick scattering medium, at a depth where conventional imaging would be impossible because of scattering effects  ...  For an ultrashort pulse, it leads to a temporal broadening, in addition to a drastic loss of fluence.  ... 
doi:10.1364/ol.43.002831 pmid:29905700 fatcat:3rfk3daovrf47owf6us7k6fati

Picosecond and femtosecond Fourier pulse shape synthesis

A.M. Weiner, J.P. Heritage
1987 Revue de Physique Appliquée  
We describe picosecond pulses shaped using a fiber and grating pulse compressor and femtosecond pulses shaped using a nondispersive grating compressor. The discussion includes  ...  Abstract. 2014 We review our work on the synthesis of arbitrarily shaped, coherent optical pulses, by spatial filtering in a grating pulse compressor.  ...  We have applied this technique to investigate the phase spectrum of compressed pulses in the presence of intense stimulated Raman scattering (SRS) in a 145-meter fiber [14] .  ... 
doi:10.1051/rphysap:0198700220120161900 fatcat:gid7xts2grgsvdx6xzhacr37nu
« Previous Showing results 1 — 15 out of 1,974 results