Towards a petawatt-class few-cycle infrared laser system via dual-chirped optical parametric amplification

Fu, Yuxi; Midorikawa, Katsumi; Takahashi, Eiji J.

doi:10.1038/s41598-018-25783-0

Cited by 37 publications

(13 citation statements)

References 50 publications

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“…The DC-OPA system can provide wavelength tunable laser pulses from 1.2 to 4 µm with pulses compressed to close to TL durations of 1.2-1.6 µm and 3-4 µm with TW class peak power. In this experiment, the central wavelength of the DC-OPA was tuned to 1.55 µm, which is an air transmission window, with a duration of 45 fs (FWHM) and a pulse energy of up to 80 mJ [23]. The high-energy pulses were loosely focused by an f = 2 m lens (CaF 2 ) with an anti-reflection coating.…”

Section: Resultsmentioning

confidence: 99%

“…In this paper, we demonstrate a robust approach to generate over nJ/pulse energy HHs in the water window soft X-ray, using our recently developed TW-class MIR femtosecond laser system with a maximum pulse energy of 100 mJ in the wavelength tuning range of 1.2-2.4 µm [23,24] using a dual-chirped optical parametric amplification (DC-OPA) scheme [25]. By combining a meterlong loose focusing geometry, a neutral gas medium, and a low gas pressure, we achieved optimum phase matching and high conversion efficiency [26] in the soft X-ray region.…”

Section: Introductionmentioning

confidence: 99%

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Energy scaling of water window high-order harmonic generation for single-shot soft X-ray spectroscopy and live-cell imaging

Fu,

Nishimura,

Shao

et al. 2020

Preprint

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Full coherent soft X-ray attosecond pulses are now available through high-order harmonic generation (HHG); however, its insufficient output energy hinders various applications, such as attosecondscale soft X-ray nonlinear experiments, the seeding of soft X-ray free-electron lasers, attosecondpump-attosecond-probe spectroscopies, and single-shot imaging. In this paper, towards the implementation of these exciting studies, we demonstrate a soft X-ray harmonic beam that is more than two orders of magnitudes stronger up to the water window region compared to previous works. This was achieved by combining a newly developed TW class mid-infrared femtosecond laser and a loosely focusing geometry for HHG in the mid-infrared region for the first time. Thanks to a loosely focusing geometry with a neutral medium target, we achieve a high conversion efficiency, a low beam divergence, and a significantly reduced medium gas pressure. As the first application of our nano-joule level water window soft X-ray harmonic source, we demonstrate near edge X-ray absorption fine structure (NEXAFS) experiments with clear fine absorption spectra near the K-and L-edges observed in various samples. The systematic study of a robust energy scaling method on HHG opens the door for demonstrating single-shot absorption spectrum and live cell imaging with a femtosecond time resolution.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Energy scaling of water window high-order harmonic generation for single-shot soft X-ray spectroscopy and live-cell imaging

Fu,

Nishimura,

Shao

et al. 2020

Preprint

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“…However, due to the wave packet spreading in the continuum the efficiency of HHG scales as λ − − (5 6) 12 . HHG by long wavelength pulses has gained attention since the laser technology has evolved and ultrashort, carrier-to-envelop phase (CEP) stable laser pulses at high intensity are available also in the MIR spectral domain 2,[13][14][15][16][17][18][19][20][21] .…”

Section: Generation Of Two Successive Attosecond Pulses In Separate Smentioning

confidence: 99%

Generation of two successive attosecond pulses in separate spectral domains

Kovács

Toşa

2020

Sci Rep

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Modeling Tools and Proposed Experimental Configuration Model. The numerical simulations have been carried out using the extended version of the 3D non-adiabatic model presented in 27. In this framework we first solve the pulse propagation in ionized gas medium and then calculate the atomic dipole induced by the driving field using the strong-field approximation (SFA) 28. The macroscopic harmonic signal is the result of the coherent superposition of the single dipole emissions in each spatial point. The interaction region has cylindrical symmetry in the simulations. Since the model has been described in several papers 27,29-31 , we summarize here the main steps of the calculation.

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“…In our recent work, we successfully generated an IR laser with 100-mJ-class energy, a TW-class peak power IR laser, and a 10 Hz repetition rate [52] using a DC-OPA [53][54][55][56][57]. The nonlinear crystals employed in the DC-OPA system were β-BaB 2 O 4 (BBO) crystals.…”

Section: Tw-class Mir Laser Source Based On Dc-opamentioning

confidence: 99%

Towards GW-Scale Isolated Attosecond Pulse Far beyond Carbon K-Edge Driven by Mid-Infrared Waveform Synthesizer

Yuan

Midorikawa

et al. 2018

Applied Sciences

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We discuss the efficient generation of intense “water window” (0.28–0.54 keV) isolated attosecond pulses (IAPs) using a mid-infrared (MIR) waveform synthesizer. Our numerical simulations clearly indicate that not only a longer-wavelength driving laser but also a weak control pulse in the waveform synthesizer helps extend the continuum cutoff region and reduce the temporal chirp of IAPs in high-order harmonic generation (HHG). This insight indicates that a single-cycle laser field is not an optimum waveform for generating the shortest IAP from the veiwpoints of reducing the attochirp and increasing the efficiency of HHG. By combining a waveform synthesizer technology and a 100 mJ MIR femtosecond pulse based on a dual-chirped optical parametric amplification (DC-OPA) method, a gigawatt-scale IAP (55 as with 10 nJ order) in the water window region can be generated even without attochirp compensation. The MIR waveform synthesizer is highly beneficial for generating a shorter IAP duration in the soft X-ray region because there are no suitable transparent dispersive materials that can be used for compressing the attochirp.

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Towards a petawatt-class few-cycle infrared laser system via dual-chirped optical parametric amplification

Cited by 37 publications

References 50 publications

Energy scaling of water window high-order harmonic generation for single-shot soft X-ray spectroscopy and live-cell imaging

Energy scaling of water window high-order harmonic generation for single-shot soft X-ray spectroscopy and live-cell imaging

Generation of two successive attosecond pulses in separate spectral domains

Towards GW-Scale Isolated Attosecond Pulse Far beyond Carbon K-Edge Driven by Mid-Infrared Waveform Synthesizer

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