Exciting the Isomeric Th229 Nuclear State via Laser-Driven Electron Recollision

Physical Review Letters, Journal Year: 2021, Volume and Issue: 127(5)

Published: July 27, 2021

We propose a new approach to excite the isomeric $^{229}\mathrm{Th}$ nuclear state, which has attracted much attention recently as potential ``nuclear clock.'' Our is based on laser-driven electron recollision process, core process of strong-field atomic physics. Bringing together knowledge physics and related physics, we calculate excitation probability. This does not require precise energy state. The well timed may be exploited control coherence Experimental realization within reach using tabletop laser systems.

Language: Английский

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Long seed, short pump: converting Yb-doped laser radiation to multi-µJ few-cycle pulses tunable through 2.5–15 µm

Optics Express, Journal Year: 2022, Volume and Issue: 30(8), P. 13009 - 13009

Published: March 17, 2022

We present a setup for generating broadband (up to 1050 cm-1) and broadly tunable (2.5-15 µm) mid-infrared pulses using an Yb-doped femtosecond laser as the pump source. Our scheme, comprising two parametric amplifiers mixing stage, exploits favorable group velocity matching conditions in GaSe pumped at 2 µm directly produce sub-70 fs throughout tuning range without any additional dispersion compensation, while 30-50 pulse durations are achieved with simple compensation by propagation through thin bulk media. The generated have sub-1% short- long-term energy noise, well stable spectral parameters, delivering 0.5-2 W average mid-IR power. expect source be useful various spectroscopic applications mid-IR.

Language: Английский

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Ultrafast Tm-doped fiber laser system delivering 1.65-mJ, sub-100-fs pulses at a 100-kHz repetition rate

Optics Letters, Journal Year: 2022, Volume and Issue: 47(12), P. 3095 - 3095

Published: May 26, 2022

High-energy, ultrafast, short-wavelength infrared laser sources with high average power are important tools for industrial and scientific applications. Through the coherent combination of four ultrafast thulium-doped rod-type fiber amplifiers, we demonstrate a Tm-doped chirped pulse amplification system compressed energy 1.65 mJ 167 W output at repetition rate 101 kHz. The delivers 85 fs pulses peak 15 GW. Additionally, presents long- short-term stability. To best our knowledge, this is highest short wavelength IR, mJ-class source to date. This result shows potential beam combining techniques in spectral region scalability these systems.

Language: Английский

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Optical Waveform Synthesis and Its Applications

Laser & Photonics Review, Journal Year: 2023, Volume and Issue: 17(4)

Published: Jan. 31, 2023

Abstract The quest for ever‐shorter optical pulses has been ongoing over half a century. Although few‐cycle have generated nearly 40 years, pulse lengths below the single‐cycle limit remained an elusive goal long time. For this purpose, waveform synthesizers, generating high‐energy, high‐average‐power via coherent combination of multiple covering different spectral regions, recently developed. They allow unprecedented control waveforms, spanning extremely broad range from ultraviolet to infrared. Such allows steering strong‐field interactions with increased degrees freedom. When driving high‐harmonic generation, tailored waveforms can produce bright attosecond trains and even isolated tunable spectra up soft X‐ray range. In paper recent progress on parametric hollow‐core fiber synthesizers is discussed. Newly developed seeding schemes; absolute, relative, phase measurement; techniques suitable are described. serial parallel synthesis based Ti:sapphire Ytterbium laser systems their latest applications in generation gaseous solid media, science, wakefield acceleration

Language: Английский

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Controlling laser-dressed resonance line shape using attosecond extreme-ultraviolet pulse with a spectral minimum

Proceedings of the National Academy of Sciences, Journal Year: 2024, Volume and Issue: 121(2)

Published: Jan. 3, 2024

High-harmonic generation from a gas target exhibits sharp spectral features and rapid phase variation near the Cooper minimum. By applying filtering, shaped isolated attosecond pulses can be generated where pulse is split into two in time domain. Using such extreme-ultraviolet (XUV) pulses, we theoretically study transient absorption (ATA) spectra of helium 2 s mathvariant="bold-italic">p autoionizing state which resonantly coupled to dark by time-delayed infrared laser. Our simulations show that asymmetric Fano line shape readily tuned symmetric Lorentzian within delay few tens attoseconds. Such efficient control due destructive interference when it excited strongly XUV pulse. This compared prior experiments tuning resonance would take femtoseconds. We also predicted ATA observed experimentally after propagation medium. results suggest offer opportunity for controlling probing fine narrow resonances on few-ten attoseconds timescale.

Language: Английский

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Stable Ga2O3 soft x-ray detector with ultrahigh responsivity

Applied Physics Letters, Journal Year: 2024, Volume and Issue: 124(18)

Published: April 29, 2024

Soft x-ray detectors play crucial roles in biology, chemistry, and lithography. Current soft suffer from insufficient responsivity (R), excessively large cell area, limited stability. Here, the β-Ga2O3 detector is constructed, effects of varying sensitive layer thickness voltage on detection characteristics device are explored. Meanwhile, mechanism multiplication ionization process photoconductivity gain photoresponse performance analyzed. The obtains R up to 3.05 × 103 A/W under 300 eV irradiation at synchrotron beamline, which about 1.19 104 times higher than that conventional device. Ga2O3 also maintains stable operation long-term multicycle switching. These results indicate an ideal candidate material for detection, has great potential applications such as imaging biological cells.

Language: Английский

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High-power few-cycle Cr:ZnSe mid-infrared source for attosecond soft x-ray physics

Optica, Journal Year: 2020, Volume and Issue: 7(8), P. 981 - 981

Published: June 10, 2020

The development of mid-infrared, high-energy pulses extremely short pulse duration is great importance to the strong-field physics community, as it enables extension high-harmonic cutoff towards keV range photon energies. Here we demonstrate a C mathvariant="normal">r 2 + : mathvariant="normal">Z mathvariant="normal">n mathvariant="normal">S mathvariant="normal">e laser amplifier delivering 7 mJ, 100 fs at 1 kHz repetition rate and 2.4 µm central wavelength with excellent energy stability beam quality. These are post-compressed 39 fs, 6.2 115 GW peak power in novel nonlinear compression scheme. system was used generate coherent soft x-ray radiation up 0.6 covering entire water window, which high for bio-relevant applications. obtained results open wide applications optics, attosecond physics, remote sensing.

Language: Английский

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Generation and characterization of isolated attosecond pulses at 100 kHz repetition rate

Optica, Journal Year: 2021, Volume and Issue: 9(2), P. 145 - 145

Published: Dec. 20, 2021

The generation of coherent light pulses in the extreme ultraviolet (XUV) spectral region with attosecond pulse durations constitutes foundation field science. Twenty years after first demonstration isolated pulses, they continue to be a unique tool enabling observation and control electron dynamics atoms, molecules, solids. It has long been identified that an increase repetition rate sources is necessary for many applications atomic molecular physics, surface science, imaging. Although high harmonic (HHG) at rates exceeding 100 kHz, showing continuum cutoff XUV spectrum, was already demonstrated 2013, number photons per insufficient perform characterization via streaking, let alone pump-probe experiment. Here we report on full HHG driven by near-single-cycle kHz. 10 6 target enables streaking experiments through which are determined consist dominant single pulse. These results open door spectroscopy studies 1 or 2 orders magnitude above current implementations.

Language: Английский

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High power, high repetition rate laser-based sources for attosecond science

Journal of Physics Photonics, Journal Year: 2022, Volume and Issue: 4(3), P. 032001 - 032001

Published: May 31, 2022

Abstract Within the last two decades attosecond science has been established as a novel research field providing insights into ultrafast electron dynamics that follows photoexcitation or photoionization process. Enabled by technological advances in laser amplifiers, turn, powerful engine driving development of sources intense pulses. This article focuses on high repetition rate laser-based delivering energy pulses with duration only few optical cycles, for applications science. In particular, power, parametric chirped pulse amplification system is described, which was developed to drive an pump-probe beamline targeting experiments electron-ion coincidence detection at acquisition rates.

Language: Английский

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Nonlinear pulse compression to sub-two-cycle, 1.3 mJ pulses at 1.9 μm wavelength with 132 W average power

Optics Letters, Journal Year: 2023, Volume and Issue: 48(10), P. 2647 - 2647

Published: April 14, 2023

We report the nonlinear pulse compression of a high-power, thulium-doped fiber laser system using gas-filled hollow-core fiber. The sub-two cycle source delivers 1.3 mJ energy with 80 GW peak power at central wavelength 1.87 μm and an average 132 W. This is, so far, to best our knowledge, highest few-cycle reported in short-wave infrared region. Given its unique combination high power, this is excellent driver for frequency conversion, toward terahertz, mid-infrared, soft X-ray spectral regions.

Language: Английский

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