Spatio-temporal and -spectral coupling of shaped laser pulses in a focusing geometry

Coughlan, Matthew A.; Plewicki, Mateusz; Levis, Robert J.

doi:10.1364/oe.18.023973

Cited by 8 publications

(11 citation statements)

References 29 publications

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“…The pulse front tilt has been measured experimentally by Coughlan et al [8] with scanning spectral interferometry. The spatio-temporal pulse structure has also been manipulated with a spectral pulse shaper placed before the angularly dispersive optics [21,22]. Much of the space-time structure of focused spatially-chirped beams can be calculated in the spatio-spectral domain.…”

Section: Frequency-space Analysis and Double Abcd Propagationmentioning

confidence: 99%

Intuitive analysis of space-time focusing with double-ABCD calculation

et al. 2012

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We analyze the structure of space-time focusing of spatially-chirped pulses using a technique where each frequency component of the beam follows its own Gaussian beamlet that in turn travels as a ray through the system. The approach leads to analytic expressions for the axially-varying pulse duration, pulse-front tilt, and the longitudinal intensity profile. We find that an important contribution to the intensity localization obtained with spatial-chirp focusing arises from the evolution of the geometric phase of the beamlets.

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Section: Frequency-space Analysis and Double Abcd Propagationmentioning

confidence: 99%

Intuitive analysis of space-time focusing with double-ABCD calculation

et al. 2012

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“…This can be intuitively inferred from the anisotropy of the OPD change due to bending along only one axis. In other words, the large bending-induced inter-core group delays focus the various frequencies within the spectral width of the pulse into different spatial spots; this effect is reminiscent of the time-space coupling as observed in temporal pulse shapers [28,29]. With this one observes a bending-induced distortion of the focal spot in Figs.…”

Section: Methodsmentioning

confidence: 85%

Bending-induced inter-core group delays in multicore fibers

Tsvirkun¹,

Sivankutty²,

Bouwmans³

et al. 2017

Opt. Express

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We examine the impact of fiber bends on ultrashort pulse propagation in a 169-core multicore fiber (MCF) by numerical simulations and experimental measurements. We show that an L-shaped bend (where only one end of the MCF is fixed) induces significant changes in group delays that are a function of core position but linear along the bending axis with a slope directly proportional to the bending angle. For U- and S-shaped bends (where both ends of the MCF are fixed) the induced refractive index and group delay changes are much smaller than the residual, intrinsic inter-core group delay differences of the unbent MCF. We further show that when used for point-scanning lensless endoscopy with ultrashort pulse excitation, bend-induced group delays in the MCF degrade the point-spread function due to spatiotemporal coupling. Our results show that bend-induced effects in MCFs can be parametrized with only two parameters: the angle of the bend axis and the amplitude of the bend. This remains valid for bend amplitudes up to at least 200 degrees.

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“…Cl 4+ was observed in CH 2 BrCl spectra taken on System I with reduced-energy TL pulses producing as little as ∼ 50% of the laser intensity reported in Table I (not shown). These results suggest that the maximum intensity produced on System II is no more than ∼ 50% of the intensity produced on System I, which is significantly less than the ∼ 80% of the System I intensity expected based on the experimental parameters in Tables I and II. The discrepancy in actual focal intensity between the two laser systems may have contributions from small differences in the spatial chirp of the output beam from the respective pulse shapers 19,23 . The experimental re-sults presented below conducted on System II will be discussed within the context of the difference in the laser intensities observed on Systems I and II.…”

Section: A Comparison Of Relative Laser Intensitymentioning

confidence: 99%

“…In this case, photonic reagent transfer requires specifying or calibrating the control settings on the second pulse shaper to reproduce the original spectral phase. Characterization of the corresponding output shaped pulses, for example via FROG 17 , SPIDER 18 , or SEA TADPOLE 19 , could verify production of the same output shaped pulse. However, coupling of the spatial and temporal profiles of the laser pulse arising from distortion introduced by the optical elements of the shaper can result in distinct spatial pulse profiles, even for nominally the same temporally shaped pulse [20][21][22] .…”

Section: Introductionmentioning

confidence: 99%

Laboratory transferability of optimally shaped laser pulses for quantum control

Tibbetts

Rabitz

2014

The Journal of Chemical Physics

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Optimal control experiments can readily identify effective shaped laser pulses, or "photonic reagents," that achieve a wide variety of objectives. An important additional practical desire is for photonic reagent prescriptions to produce good, if not optimal, objective yields when transferred to a different system or laboratory. Building on general experience in chemistry, the hope is that transferred photonic reagent prescriptions may remain functional even though all features of a shaped pulse profile at the sample typically cannot be reproduced exactly. As a specific example, we assess the potential for transferring optimal photonic reagents for the objective of optimizing a ratio of photoproduct ions from a family of halomethanes through three related experiments. First, applying the same set of photonic reagents with systematically varying second- and third-order chirp on both laser systems generated similar shapes of the associated control landscape (i.e., relation between the objective yield and the variables describing the photonic reagents). Second, optimal photonic reagents obtained from the first laser system were found to still produce near optimal yields on the second laser system. Third, transferring a collection of photonic reagents optimized on the first laser system to the second laser system reproduced systematic trends in photoproduct yields upon interaction with the homologous chemical family. These three transfers of photonic reagents are demonstrated to be successful upon paying reasonable attention to overall laser system characteristics. The ability to transfer photonic reagents from one laser system to another is analogous to well-established utilitarian operating procedures with traditional chemical reagents. The practical implications of the present results for experimental quantum control are discussed.

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Spatio-temporal and -spectral coupling of shaped laser pulses in a focusing geometry

Cited by 8 publications

References 29 publications

Intuitive analysis of space-time focusing with double-ABCD calculation

Intuitive analysis of space-time focusing with double-ABCD calculation

Bending-induced inter-core group delays in multicore fibers

Laboratory transferability of optimally shaped laser pulses for quantum control

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