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

Pastirk, Igor; Zhu, Xiangwei; Martin, Rebekah M.; Dantus, Marcos

doi:10.1364/oe.14.008885

Cited by 21 publications

(14 citation statements)

References 9 publications

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“…[13][14][15][16][35][36][37][38][39][40][41][42][43][44] On one hand, a 7-hydroxyquinoline molecule can form a cyclically H-bonded complex with two protic solvent molecules such as water and alcohols, so that proton relay from the enolic group to the imino group of 7-hydroxyquinoline occurs along a H-bonded solvent chain in a concerted fashion. 15,16,[42][43][44] On the other hand, those two prototropic groups of 6-hydroxyquinoline (6HQ) are too far from each other to form a cyclic complex with solvent molecules, so that proton transfer from the enolic group to the imino group of 6HQ takes place in a stepwise manner via accumulating cationic or anionic intermediate species.…”

Section: Notesmentioning

confidence: 99%

Anomalous Acid-Base Equilibria in Biologically Relevant Water Nanopools

Park

Yoo²,

Pyo³

et al. 2012

Bulletin of the Korean Chemical Society

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Water plays a crucial role in many principal biological phenomena such as enzymatic catalysis and proton pumping through a membrane protein channel.1-4 Moreover, in biological systems, water is usually contained in a small pocket of a membrane, 5-8 and such confined water, which is generally called a water nanopool, [8][9][10] shows peculiar properties differing considerably from the properties of bulk water. 8-16The confinement effect and the enclosing interfacial surfaces of waterpools are the main factors to determine the properties, such as polarity, viscosity, and H-bonding ability, of water nanopools.5-13 For example, the dielectric constant of a water nanopool has been reported to be much lower than that of bulk water (ε = 78.5)17 but similar to that of an alcohol (ε = 30-40).18,19 On the other hand, biological processes often take place based on proton relay along a hydrogen (H)-bonded chain, [1][2][3][4][20][21][22][23][24] and the dynamics of biological proton relay is determined by the size, the structure, and the motion of a water cluster which is the prime agent in most of biological systems. 3,[13][14][15][24][25][26] Thus, for better understanding of cellular dynamics, it is necessary to investigate the properties of a biologically relevant water nanopool as a biomimetic system of water confined in a cell membrane. In this regard, water nanopools confined in reverse micelles, which are formed by surfactant molecules having polar headgroups pointing inward and dispersed in hydrocarbon solvents, can be good model systems of biological water. 6,18,19,27 It is a unique feature of reverse micelles that they can make nonpolar media to solubilize a large amount of water by encapsulating water molecules in their inner polar cores; 28 reverse micelles are surrounded by a layer of surfactant molecules such as Aerosol-OT (sodium 1,4-bis-2-ethylhexylsulfosuccinate, AOT) and immersed in a nonpolar solvent, so that nanometer-sized droplets of a polar solvent such as water are formed inside. The polar headgroups of surfactant molecules point inward toward a polar solvent pool, and the alkyl chains of the surfactant molecules point outward toward a nonpolar solvent. About 20 surfactant molecules of AOT form a reverse micelle having a diameter of 3.0 nm above the critical concentration of 1 mM in a hydrocarbon solvent such as n-heptane.29 By adding water to the AOT solution, microemulsions of nanometer-sized water droplets surrounded by AOT molecules are formed, and the size of water nanopools confined in AOT reverse micelles increases as the concentration of water increases. In n-heptane, the diameters in nanometers of the waterpools have been reported to be about 0.3w 0 , in which w 0 is the molar ratio of water to AOT. 30The catalytic properties of water nanopools depend strongly on the hydration extent of reverse micelles and on the solvation structure of reactants relevant to the polarity of waterpools confined in reverse micelles. [5][6][7][8]17,18 The peculiar structure of waterpools contained in reverse mi...

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Section: Notesmentioning

confidence: 99%

Anomalous Acid-Base Equilibria in Biologically Relevant Water Nanopools

Park

Yoo²,

Pyo³

et al. 2012

Bulletin of the Korean Chemical Society

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“…MIIPS has been shown to successfully characterize and shape amplified laser pulses ϳ30 m away from the exit aperture of the amplifier [47], a distance only limited by laboratory space. The method can in principle be used with targets placed kilometers away.…”

Section: Accurate Pulse Shapingmentioning

confidence: 99%

Interference without an interferometer: a different approach to measuring, compressing, and shaping ultrashort laser pulses

et al. 2008

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The inherent brevity of ultrashort laser pulses prevents a direct measurement of their electric field as a function of time; therefore different approaches based on autocorrelation have been used to characterize them. We present a discussion, guided by experimental studies, regarding accurate measurement, compression, and shaping of ultrashort laser pulses without autocorrelation or interferometry. Our approach based on phase shaping, multiphoton intrapulse interference phase scan, provides a direct measurement of the spectral phase. Illustrations of this method include new results demonstrating wavelength independence, compatibility with sub-5 fs pulses, and a perfect match for experimental coherent control and biomedical imaging applications.

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“…Among the processes that may affect the propagation of an ultrashort laser pulse, thermal turbulence is likely the most effective in preventing remote control techniques. In fact, contrary to dispersion and Kerr-related effects, distortions induced by turbulence cannot be avoided by a sensible choice of the pulse characteristics, or precompensated, 8,9 due to their random nature. Pointing variation and wavefront distortions ͑speckles͒ of nanosecond or cw laser beams induced by atmospheric turbulence have been extensively studied.…”

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confidence: 99%

Effects of atmospheric turbulence on remote optimal control experiments

Extermann

Béjot

Bonacina

et al. 2008

Applied Physics Letters

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Distortions of ultrashort laser pulses propagating through turbulence are investigated both experimentally and numerically. As expected, a strong correlation is found between temporal distortions and local intensity on the speckle pattern. We suggest that the localization of distortions in low-intensity regions may favor remote control strategies based on nonlinear interactions with respect to those based on linear schemes

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

Cited by 21 publications

References 9 publications

Anomalous Acid-Base Equilibria in Biologically Relevant Water Nanopools

Anomalous Acid-Base Equilibria in Biologically Relevant Water Nanopools

Interference without an interferometer: a different approach to measuring, compressing, and shaping ultrashort laser pulses

Effects of atmospheric turbulence on remote optimal control experiments

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