High-order harmonic generation in laser-produced ions using a near-infrared laser

Wahlström, Claes‐Göran; Borgstrom, S; Larsson, Jörgen; Pettersson, Sven-Göran

doi:10.1103/physreva.51.585

Cited by 113 publications

(41 citation statements)

References 17 publications

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“…A large effort has been devoted to increasing the photon number. Early studies have mostly concentrated on optimization with respect to atomic or molecular gases (see, for example, [4][5][6][7][8][9]), and to the laser wavelength [4,10], thus addressing mostly the single-atom emission. Lompré et al pointed out the importance of using a loose focusing geometry [11].…”

Section: Introductionmentioning

confidence: 99%

Influence of the medium length on high-order harmonic generation

Delfin¹,

Altucci

Fabbri

et al. 1999

J. Phys. B: At. Mol. Opt. Phys.

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Influence of the medium length on high-order harmonic generationDelfin, C; Altucci, C; De Filippo, F; de Lisio, C; Gaarde, Mette; Lhuillier, A; Roos, L; Wahlström, Claes-Göran Link to publication Citation for published version (APA): Delfin, C., Altucci, C., De Filippo, F., de Lisio, C., Gaarde, M., L'Huillier, A., ... Wahlström, C-G. (1999). Influence of the medium length on high-order harmonic generation. Journal of Physics B: Atomic, Molecular and Optical Physics, 32(22), 5397-5409. DOI: 10.1088/0953-4075/32/22/316 General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal Take down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Influence of the medium length on high-order harmonic generation Influence of the medium length on high-order harmonic generation Abstract. We study high-order harmonic generation using a 110 fs Ti:sapphire laser loosely focused into a variable-length gas cell filled with neon or argon at 5 mbar pressure. The harmonic intensity is recorded as a function of the medium length, varying between 2 and 21 mm. Several cases are examined, the 17th and the 29th harmonic in argon, and the 29th and 51st harmonic in neon, at the same intensity 4 × 10 14 W cm −2 . We find that the length which maximizes the harmonic yield varies from 10 mm to more than 20 mm. We discuss the different effects affecting the photon yield of the high-order harmonics.

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Section: Introductionmentioning

confidence: 99%

Influence of the medium length on high-order harmonic generation

Delfin¹,

Altucci

Fabbri

et al. 1999

J. Phys. B: At. Mol. Opt. Phys.

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“…The cut-off energies of the HHG using KrF excimer lasers (248 nm wavelength) were 64.92 eV and 105 eV, for potassium (Akiyama et al, 1992) and lead ions (Kubodera et al, 1993) produced in laser-plasmas. On the other hand, experiments using Ti:sapphire lasers as the pump have only demonstrated cut-off up to the 27 th harmonic (29.4 nm wavelength) using sodium and potassium ions (Wahlstrom et al, 1995). In all of the above experiments with rare-gas-like ions, the plateau was never observed.…”

Section: Introductionmentioning

confidence: 95%

“…The saturation intensity can be increased using shorter-duration laser pulses or using atoms with a large ionization potential, thus allowing the atoms to survive higher laser intensity before ionizing. For example, instead of rare-gas atoms, rare-gas like ions in laser-produced plasmas of alkali metal has been used in the past for HHG (Akiyama et al, 1992;Kubodera et al, 1993;Wahlstrom et al, 1995). The basic idea was to capitalize on the high ionization potential of alkali metal, which is higher than those of any other gas atom.…”

Section: Introductionmentioning

confidence: 99%

High-Order Harmonic Generation from Low-Density Plasma

Ozaki¹,

Ganeev²,

Suzuki³

et al. 2010

Advances in Solid State Lasers Development and Applications

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“…[8][9][10][11][12] The higher ionization potentials of ions as compared with neutral noble gas atoms would result in the extension of the harmonic cutoff towards shorter wavelengths. However, those experiments have shown that ionization-induced defocusing of the fundamental laser beam plays a detrimental effect on the HHG process.…”

Section: Introductionmentioning

confidence: 99%

Low-order harmonic generation in metal ablation plasmas in nanosecond and picosecond laser regimes

López-Arias¹,

Oujja²,

Sanz³

et al. 2012

Journal of Applied Physics

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Low-order harmonics, 3rd and 5th, of IR (1064 nm) laser emission have been produced in laser ablation plasmas of the metals manganese, copper and silver. The harmonics were generated in a process triggered by laser ablation followed by frequency upconversion of a fundamental laser beam that propagates parallel to the target surface.These studies were carried out in two temporal regimes by creating the ablation plasma using either nanosecond or picosecond pulses and then probing the plasma plume with pulses of the same duration. The spatiotemporal behaviour of the generated harmonics was characterized and reveals the distinct composition and dynamics of the plasma species that act as nonlinear media, allowing the comparison of different processes that control the generation efficiency. These results serve to guide the choice of laser ablation plasmas to be used for efficient high harmonic generation of laser radiation. 2 I INTRODUCTIONHarmonic generation (HG) of intense laser pulses in isotropic media such as gases and vapours serves to create coherent radiation in the short wavelength range of the spectrum down to the extreme ultraviolet (XUV) and X-ray regions. Low-order frequency up conversion using laser pulses of nanosecond (ns) duration have provided table-top vacuum ultraviolet (VUV) coherent light for spectroscopy and molecular photodissociation studies. 1,2 On the other hand, high-order harmonic generation 3 (HHG) requires pulses of higher intensities (typically 10 14 -10 15 W/cm 2 ) which can easily be achieved with femtosecond (fs) driving lasers. Although the phenomenon of HG is universal and can be generalized to any material with sufficient non linear response, mostly atomic, 4,5 or in some cases, molecular 6,7 gas jets have been investigated as nonlinear media. In practical applications of coherent short wavelength HG sources, a high conversion efficiency and thus high photon flux of the harmonic radiation are essential.Since the beginning of the nineties, ions generated in laser ablation plasmas have been investigated as alternative isotropic media for HHG. [8][9][10][11][12] The higher ionization potentials of ions as compared with neutral noble gas atoms would result in the extension of the harmonic cutoff towards shorter wavelengths. However, those experiments have shown that ionization-induced defocusing of the fundamental laser beam plays a detrimental effect on the HHG process.Together with atomic ions and neutrals, laser ablation can easily generate other species, such as aggregates, clusters and nanoparticles, with various nonlinear optical properties and a relative abundance that can in principle be controlled by the right choice of solid target and laser wavelength and pulse duration. Akiyama et al 9 noted that control of limiting factors (self-defocusing and wave phase mismatch between the harmonics and the radiation being converted) leads to efficient HHG in alkali ions generated by laser 3 ablation. In the last few years more research has demonstrated the advantages of usin...

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High-order harmonic generation in laser-produced ions using a near-infrared laser

Cited by 113 publications

References 17 publications

Influence of the medium length on high-order harmonic generation

Influence of the medium length on high-order harmonic generation

High-Order Harmonic Generation from Low-Density Plasma

Low-order harmonic generation in metal ablation plasmas in nanosecond and picosecond laser regimes

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