High-Brightness High-Order Harmonic Generation by Truncated Bessel Beams in the Sub-10-fs Regime

Nisoli, M.; Priori, E.; Sansone, G.; Stagira, S.; Cerullo, Giulio; Silvestri, S. De; Altucci, C.; Bruzzese, R.; Lisio, C. de; Villoresi, Paolo; Poletto, Luca; Pascolini, M.; Tondello, G.

doi:10.1103/physrevlett.88.033902

Cited by 80 publications

(52 citation statements)

References 21 publications

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“…Thus for TB beams a broad good phase-matching region close to the axis from z=-1.5 to 1.5 mm for "short"-trajectory harmonics can be achieved. This conclusion is consistent with the experimental results of Nisoli et al [141]. For the typical gas-jet length (∼ 1 mm), the phase matching conditions should depend strongly on the position of the gas jet, and for whether it is Type-1 Bessel or Gaussian (w 0 =25 µm) beams.…”

Section: Phase Matching Conditions At the Low Gas Pressuresupporting

confidence: 81%

“…Nisoli et al [141] have shown that the characteristics of HHG using a truncated Bessel As discussed in Sec. 1.3.1, phase matching is a pre-requisite for efficient generation of high harmonics.…”

Section: Phase Matching Conditions At the Low Gas Pressurementioning

confidence: 99%

“…In the following we will show two truncated Bessel (TB) beams from the different optical systems, which have been used by Nisoli et al [141] and…”

Section: D2 Truncated Bessel Beammentioning

confidence: 99%

“…At the exit of the fiber a truncated Bessel (TB) beam is produced instead of a Gaussian beam. Nisoli et al [141] have shown that the spatial properties (divergence and brightness) of the harmonics were greatly improved using a TB beam as the driving laser pulse. To simulate harmonics generated by few-cycle pulses we generalize the propagation code to include situations where the spatial distribution of the generating laser pulse is a TB beam.…”

Section: Introductionmentioning

confidence: 99%

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Theory of Nonlinear Propagation of High Harmonics Generated in a Gaseous Medium

Jin

2013

Springer Theses

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In this thesis, we establish the theoretical tools to investigate high-order harmonic generation (HHG) by intense infrared lasers in a gaseous medium. The macroscopic propagation of both the fundamental and the harmonic fields is taken into account by solving Maxwell's wave equations, while the single-atom (or single-molecule) response is obtained by quantitative rescattering theory. The initial spatial mode of the fundamental laser is assumed either a Gaussian or a truncated Bessel beam. On the examples of Ar, N 2 and CO 2 , we demonstrate that the available experimental HHG spectra with isotropic and aligned target media can be accurately reproduced theoretically even though the HHG spectra are sensitive to the experimental conditions. We show that the macroscopic HHG can be expressed as a product of a macroscopic wave packet and a photorecombination cross section, where the former depends on laser and experimental conditions while the latter is the property of the target only. The factorization makes it possible to retrieve the single-atom or single-molecule structure information from experimental HHG spectra. As for the multiple molecular orbital contribution in HHG, it causes the disappearance of the minimum in the HHG spectrum of aligned N 2 with the increase of laser intensity, and the position of minimum in HHG spectrum of aligned CO 2 depending on many factors is also attributed to it, which could explain why the minima observed in different laboratories may differ. For an important application of HHG as ultrashort light source, we show that measured continuous harmonic spectrum of Xe due to the reshaping of the fundamental laser field can be used to produce an isolated attosecond pulse by spectral and spatial filtering in the far field. For on-going application of using HHG to ionize aligned molecules, we present the photoelectron angular distribution from aligned N 2 and CO 2 in the laboratory frame, which can be compared directly with future experiments. demonstrate that the available experimental HHG spectra with isotropic and aligned target media can be accurately reproduced theoretically even though the HHG spectra are sensitive to the experimental conditions. We show that the macroscopic HHG can be expressed as a product of a macroscopic wave packet and a photorecombination cross section, where the former depends on laser and experimental conditions while the latter is the property of the target only. The factorization makes it possible to retrieve the single-atom or single-molecule structure information from experimental HHG spectra. As for the multiple molecular orbital contribution in HHG, it causes the disappearance of the minimum in the HHG spectrum of aligned N 2 with the increase of laser intensity, and the position of minimum in HHG spectrum of aligned CO 2 depending on many factors is also attributed to it, which could explain why the minima observed in different laboratories may differ. For an important application of HHG as ultrashort light source, we show that measured continu...

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Section: Phase Matching Conditions At the Low Gas Pressuresupporting

confidence: 81%

Section: Phase Matching Conditions At the Low Gas Pressurementioning

confidence: 99%

“…In the following we will show two truncated Bessel (TB) beams from the different optical systems, which have been used by Nisoli et al [141] and…”

Section: D2 Truncated Bessel Beammentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Theory of Nonlinear Propagation of High Harmonics Generated in a Gaseous Medium

Jin

2013

Springer Theses

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show abstract

“…This angle was found by scanning over different angle values although in an experiment it would be easier to scan over the gas pressure. We found an optimal cone angle of 0.44 deg: whilst the technology to generate a SLP is still to be developed, a 5-7 fs PBB may be readily obtained by generating the harmonics in an appropriate hollow-core fibre [38]. Indeed, the modes of these fibres are precisely PBBs and the fundamental-mode cone angle is related to the fibre diameter d by d = 2.4048 · (2c)/ω 0 sin θ 0 .…”

mentioning

confidence: 99%

Carrier-envelope shearing and isolated attosecond pulse generation

et al. 2011

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Generation and Measurement of Intense Phase-Controlled Few-Cycle Laser Pulses

Baltuška

Paulus

Lindner

et al.

Femtosecond Optical Frequency Comb: Principle, Operation, and Applications

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Abstract:Intense, ultrashort waveforms of light can be produced with a predetermined electromagnetic field. These waveforms are essential in many applications of extreme nonlinear optics, most prominently in laser-driven sources of highenergy attosecond radiation. Field reproducibility in each laser shot requires a stable carrier-envelope phase. We analyze different schemes of phase-stable amplification and identify constraints limiting the precision. We describe a phase-stabilized system based on a 20 fs multipass Ti:sapphire amplifier supplemented with a fiber compression stage for producing few-cycle pulses.The amplifier introduces only a slow phase drift and, therefore, can be seeded by a standard phase-stabilized oscillator. The phase stability of the 5 fs, pulses is verified by high harmonic generation, in which different carrierenvelope phases produce distinctly different XUV spectra. The carrierenvelope phase (with a ambiguity) is calibrated from a series of spectra. The calibration allows full characterization of the electric field. The estimated precision of the phase control is better than which reduces the timing jitter between the driving laser pulse and the XUV bursts to ~250 as and enables the generation of stable, isolated attosecond pulses. We demonstrate a more robust phase measurement based on the detection of electron emission from photoionized atoms in opposite directions. This method determines the carrierenvelope phase with the accuracy and without inversion ambiguity. Using the photoionization technique, we demonstrate the Gouy effect for focused few-cycle pulses. This result is of critical importance for any phase-dependent strong-field applications of ultrashort laser pulses.

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High-Brightness High-Order Harmonic Generation by Truncated Bessel Beams in the Sub-10-fs Regime

Cited by 80 publications

References 21 publications

Theory of Nonlinear Propagation of High Harmonics Generated in a Gaseous Medium

Theory of Nonlinear Propagation of High Harmonics Generated in a Gaseous Medium

Carrier-envelope shearing and isolated attosecond pulse generation

Generation and Measurement of Intense Phase-Controlled Few-Cycle Laser Pulses

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