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    Nonlinear temporal cleaning of ultrashort laser pulses in multipass cells
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    Abstract:
    We explore the possibility of integrating third-order nonlinear optical filtering techniques in a multipass cell architecture in order to achieve simultaneous temporal compression and cleaning of ultrashort laser pulses.
    DOI: 10.1049/ic:20070413 ISBN: 978-3-8007-3042-1 Location: Berlin, Germany Conference date: 16-20 Sept. 2007 Format: PDF We present a pulse splitting mechanism by third-order dispersion in the normal dispersion regime, which leads to the excitation of new frequency components on the red side of the pulse spectrum. (2 pages) Inspec keywords: optical dispersion; high-speed optical techniques; nonlinear optics; optical pulse shaping Subjects: Nonlinear optics and devices; Ultrafast optical techniques; Nonlinear optics
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    Molecular movies : ultrafast measurements on structural dynamics of crystals and technology developments in ultrafast science Ultrafast science is an exciting physics field, enabling us to observe atoms moving within matter upon photo-excitation. Using electron 'probe' pulses and laser 'pump' pulses, we monitor dynamics in remarkable short time scales (10-15/s) with microscopic precision (10-11/m). We investigate an ultrafast insulator-to-metal transition in TSe2 and TaSe2 crystals.
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    The field of ultrafast optical science, including the generation, amplification and manipulation of ultrashort laser pulses (∽ 1 ps or less), has seen dramatic growth in the recent years. Ultrafast lasers have found diverse applications from probing ultrafast, transient chemical reactions to inertial confinement nuclear fusion studies. Materials processing such as laser drilling and cutting is one of the promising potential applications of ultrafast lasers. Ultrashort laser pulses have opened up many new possibilities in laser-matter interaction and materials processing. The extreme short pulse width makes it easy to achieve very high peak laser intensity with low pulse energies. The laser intensity can reach 1014–– 1015 W/cm2 with a pulse < 1 mJ when a sub-picosecond pulse is focused to a spot size of a few tens of micrometers. The extremely high intensity and short laser-matter interaction times lead to a highly non-equilibrium state in the material under irradiation, where electrons are driven to much higher temperatures than ions. The short duration means that the hydrodynamic motion of the matter under laser irradiation can be ignored, and there is essentially no fluid dynamics to consider during the laser-matter interaction.
    Picosecond
    State of matter
    Pulse duration
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    The accurate measurement of ultrafast pulses is extremely important in both academic and industrial fields. Revealing fast- and slow-varying pulse information simultaneously still remains a considerable challenge in ultrafast science. We propose a novel ultrafast measurement method, termed the "optical chirplet transform for observing pulse ultrafast structures (OCTOPUS)", to measure the spectrotemporal transient information on pulses. This approach slices a measured pulse into a series of orthogonal chirplet bases and transforms it into the corresponding Fourier-transform-limited pulse (FTLP) through a phase editing process, in which a programmable waveshaper iteratively achieves the mirror image of the measured pulse's phase spectrum relative to the theoretical FTLP. As a result, the ultrafast pulse field is accurately reconstructed assisted by phase spectrum retrieval. This method can both reconstruct transient fast-varying pulse fields with higher resolution and accuracy and measure other pulse information such as phase distribution and slow-varying envelope, advancing progress in ultrafast measurement technology.
    Frequency-resolved optical gating
    Transient (computer programming)
    Envelope (radar)
    Van der Waals (vdW) materials hold immense promise for new nanotechnologies. However, more insight into their behavior under non-equilibrium conditions on femtosecond time scales and their support of exotic nonlinear processes is needed. In this talk, we will first discuss our recent studies of ultrafast lattice and spin dynamics in vdW magnets. Here, we uncover unusually strong transient spin-phonon coupling, manifesting as pump helicity-dependencies and dynamic magnetostriction-driven stiffening of coherent phonon modes. In both these cases, these phenomena originate from the pronounced modulation of exchange interactions through the distortion of the lattice. We will then turn to nonlinear optical processes, namely harmonic conversion and optical parametric amplification driven by twisted light. Here, we show both the efficient harmonic scaling of orbital angular momentum and the free tuning of wavelength and topological charge of vortex beams, both supported by atomically thin semiconductors. Our work points to new ways to exploit femtosecond and structured illumination to extend the versatility of vdW materials in the pursuit of new spintronic and optoelectronic applications.
    Ultrafast optics
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    We studied ultrafast nonlinear optical response in NiCo 2 O 4 and NiCo 2 Se 4 . Our unconventional results distinguished, selenide contains compounds will serve as excellent nonlinear optical materials compared to oxides counterpart, which can be used in ultrafast switching.
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    Ultrafast optics
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    Abstract The principles of ultrafast pulse measurements are described. These principles are extended to outline a number of ultrafast experiments which interrogate molecular dynamics in the condensed phase. The response function formalism used to interpret ultrafast measurements is outlined and its application to multipulse spectroscopy is described.
    Formalism (music)
    Dynamics
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    Ultrafast lasers have matured to the point that scientists unfamiliar with ultrafast technology can purchase reliable "plug-and-play" lasers for application in their own areas of expertise. These next-generation sources, which eliminate the need for users to become intimately acquainted with ultrafast optics, have significantly broadened the application base of ultrafast lasers. No-where is this trend more evident than in the application of ultrafast science to biology and medicine.
    Ultrafast optics
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