Two-color pump-probe interferometry of ultra-fast light-matter interaction

Hayasaki, Yoshio; Fukuda, Shin; Hasegawa, S.; Juodkazis, Saulius

doi:10.1038/s41598-017-10709-z

Cited by 31 publications

(18 citation statements)

References 33 publications

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“…The use of an SLM is highly beneficial since the convenient switch between arbitrary phase profiles makes it possible to combine our diagnostic with pump–probe techniques where structured beams are involved. These structured beams indeed have a number of applications, such as high aspect ratio micro-nano structuring 58 – 62 , laser welding 63 among many others, and opens up new perspectives for studying laser-dielectric interaction in the ultrafast regime 3 , 64 , 65 . The efficiency of SLMs is conventionally higher than 50% depending on the spatial frequency of the grating used.…”

Section: Discussionmentioning

confidence: 99%

“…sub-100 fs). This is the case for instance for laser wakefield acceleration 1 , amplification in laser-excited dielectrics 2 , ultrafast ionization and plasma formation 3 , THz radiation 4 , 5 , high harmonic generation 6 , new material synthesis via laser-induced microexplosion 7 or laser nanoscale processing 8 , 9 . The initial concepts of ultrafast imaging based on repetitive pump–probe measurements 10 – 15 have been recently complemented by a large number of different schemes allowing the imaging of non-reproducible events.…”

Section: Introductionmentioning

confidence: 99%

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In-situ diagnostic of femtosecond laser probe pulses for high resolution ultrafast imaging

et al. 2021

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Ultrafast imaging is essential in physics and chemistry to investigate the femtosecond dynamics of nonuniform samples or of phenomena with strong spatial variations. It relies on observing the phenomena induced by an ultrashort laser pump pulse using an ultrashort probe pulse at a later time. Recent years have seen the emergence of very successful ultrafast imaging techniques of single non-reproducible events with extremely high frame rate, based on wavelength or spatial frequency encoding. However, further progress in ultrafast imaging towards high spatial resolution is hampered by the lack of characterization of weak probe beams. For pump–probe experiments realized within solids or liquids, because of the difference in group velocities between pump and probe, the determination of the absolute pump–probe delay depends on the sample position. In addition, pulse-front tilt is a widespread issue, unacceptable for ultrafast imaging, but which is conventionally very difficult to evaluate for the low-intensity probe pulses. Here we show that a pump-induced micro-grating generated from the electronic Kerr effect provides a detailed in-situ characterization of a weak probe pulse. It allows solving the two issues of absolute pump–probe delay determination and pulse-front tilt detection. Our approach is valid whatever the transparent medium with non-negligible Kerr index, whatever the probe pulse polarization and wavelength. Because it is nondestructive and fast to perform, this in-situ probe diagnostic can be repeated to calibrate experimental conditions, particularly in the case where complex wavelength, spatial frequency or polarization encoding is used. We anticipate that this technique will enable previously inaccessible spatiotemporal imaging in a number of fields of ultrafast science at the micro- and nanoscale.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

In-situ diagnostic of femtosecond laser probe pulses for high resolution ultrafast imaging

et al. 2021

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“…Challenges are mounting to determine (n,k) from small focal regions and to resolve their fast changes in time. Holographic imaging of the light-matter interaction region is used for the amplitude and phase determination from transmission along pump-probe propagation [79][80][81] or by probing perpendicular to the pump beam [82]. In both cases, the exact determination of (n,k) is not possible due to one probe beam.…”

Section: Current and Future Challengesmentioning

confidence: 99%

“…New imaging techniques based on multidimensional characterization of events changing in 3D volume, time, and spectrum are emerging and can solve previously encountered obstacles of characterization of micro-volumes via pump-probe interferometric techniques [82,86]. With the recent developments in imaging technologies to observe fast transient events in five dimensions [88] and rapidly converging (<5 iterations) phase retrieval approaches [89] using a single camera shot, we believe that it will be possible to obtain additional information about the rapid events occurring in a small volume in space, without the use of bulky time resolved interferometry.…”

Section: Advances In Science and Technology To Meet Challengesmentioning

confidence: 99%

Roadmap on Digital Holography-Based Quantitative Phase Imaging

et al. 2021

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Quantitative Phase Imaging (QPI) provides unique means for the imaging of biological or technical microstructures, merging beneficial features identified with microscopy, interferometry, holography, and numerical computations. This roadmap article reviews several digital holography-based QPI approaches developed by prominent research groups. It also briefly discusses the present and future perspectives of 2D and 3D QPI research based on digital holographic microscopy, holographic tomography, and their applications.

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“…Process dynamics in glasses with polarizable matrix in the presence of mobile charges (i.e. fused silica) was often discussed on ultrafast scales in terms of carrier rapid evolution and exciton trapping 14 , 15 , with less information on material long term evolution 16 , 17 . Electronic relaxation drives and, at the same time, is strongly dependent on the transient material evolution and particularly on its structural form, notably its passage via rigid or soft structural deformation phases.…”

Section: Introductionmentioning

confidence: 99%

Multiscale electronic and thermomechanical dynamics in ultrafast nanoscale laser structuring of bulk fused silica

Somayaji

Bhuyan

Bourquard

et al. 2020

Sci Rep

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We describe the evolution of ultrafast-laser-excited bulk fused silica over the entire relaxation range in one-dimensional geometries fixed by non-diffractive beams. Irradiation drives local embedded modifications of the refractive index in the form of index increase in densified glass or in the form of nanoscale voids. A dual spectroscopic and imaging investigation procedure is proposed, coupling electronic excitation and thermodynamic relaxation. Specific sub-ps and ns plasma decay times are respectively correlated to these index-related electronic and thermomechanical transformations. For the void formation stages, based on time-resolved spectral imaging, we first observe a dense transient plasma phase that departs from the case of a rarefied gas, and we indicate achievable temperatures in the excited matter in the 4,000–5,500 K range, extending for tens of ns. High-resolution speckle-free microscopy is then used to image optical signatures associated to structural transformations until the evolution stops. Multiscale imaging indicates characteristic timescales for plasma decay, heat diffusion, and void cavitation, pointing out key mechanisms of material transformation on the nanoscale in a range of processing conditions. If glass densification is driven by sub-ps electronic decay, for nanoscale structuring we advocate the passage through a long-living dense ionized phase that decomposes on tens of ns, triggering cavitation.

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Two-color pump-probe interferometry of ultra-fast light-matter interaction

Cited by 31 publications

References 33 publications

In-situ diagnostic of femtosecond laser probe pulses for high resolution ultrafast imaging

In-situ diagnostic of femtosecond laser probe pulses for high resolution ultrafast imaging

Roadmap on Digital Holography-Based Quantitative Phase Imaging

Multiscale electronic and thermomechanical dynamics in ultrafast nanoscale laser structuring of bulk fused silica

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