High-order harmonic generation in carbon vapor and low charged plasma

Theobald, W.; Wülker, C.; Schäfer, F. P.; Chichkov, Boris N.

doi:10.1016/0030-4018(95)00463-i

Cited by 92 publications

(35 citation statements)

References 25 publications

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“…1,3 Another approach is based on the preparation of ablation plume via laser-surface interaction with further propagation of short laser pulse through the plasma. [4][5][6][7][8][9] In this paper, we demonstrate the harmonic generation up to the 65th order ͑ = 12.24 nm͒ during the interaction of femtosecond pulses with boron plasma. The results of systematic studies of this process are presented.…”

Section: Introductionmentioning

confidence: 98%

Optimization of harmonic generation from boron plasma

Ganeev

Baba

Suzuki

et al. 2006

Journal of Applied Physics

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The plateau pattern of the harmonic distribution up to the 65th order (λ=12.24nm) and the 5×10−7 conversion efficiency were achieved after the propagation of femtosecond pulses through the laser-produced boron plasma. The optimization of high-order harmonics generation was carried out at the focusing conditions when the confocal parameter of fundamental radiation was close to the plasma sizes. A study of cutoff energy showed its dependence on the second ionization potential of nonlinear medium. The spatial distribution of the radiation propagating through the boron plume showed the appearance of ringlike pattern at the intensities exceeding a saturated intensity of singly charged ions.

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Section: Introductionmentioning

confidence: 98%

Optimization of harmonic generation from boron plasma

Ganeev

Baba

Suzuki

et al. 2006

Journal of Applied Physics

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Section: Resultsmentioning

confidence: 98%

“…It is also interesting to note that the relative strength of the third and fifth harmonics is independent of the time delay, indicating that this ratio is not governed by the instantaneous density of nonlinear plume species. 20 The different optimal delays and the widths of the time delay distributions, as displayed in Figure 4(a-c) among the three metals illustrate the diverse composition and dynamics of the ablation plume of each material.As concerns the spatial behaviour of the harmonic signal generated by the ns beam across the plume, Figure 4(d) includes, as an example, the z-scan measurements performed for copper under the conditions marked with an arrow in Figure 4(b). The zscan, presents a single maximum, corresponding to focusing the driving laser at the centre of the plasma and this characteristic is found also for Mn and Ag.…”

mentioning

confidence: 98%

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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“…The earlier used approaches of a rotating disc geometry [39,40] for the movement of targets during ablation are not suitable since the distance between driving femtosecond beam and target surface should be maintained minimal (of order of 100 m), while the Rayleigh length of the driving beam is maintained at the range of a few mm. Below we discuss a new method using a motorized rotating rod specifically prepared for the HHG from plasma plumes using high pulse repetition rate lasers, and demonstrate that this target significantly improves the stability of high-order harmonics [16].…”

Section: Stable Generation Of High-order Harmonics Of Femtosecond Lasmentioning

confidence: 99%

New Approaches in Frequency Conversion of Laser Radiation in Plasma Plumes

Ganeev¹

2013

OPJ

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Recent studies of plasma harmonic generation are reviewed. We show the advances of this technique for generation of coherent ultrashort pulses in the extreme ultraviolet range. Among the achievements highlighted in this review are the comparative experimental and theoretical studies of high-order harmonic generation in silver plasma, isolated subfemtosecond pulse generation in Mn plasma ablation, stable generation of high-order harmonics of femtosecond laser radiation from laser produced plasma plumes at 1 kHz pulse repetition rate, and high-order harmonic generation in fullerenes using few-and multi-cycle pulses of different wavelengths. We show that new developments of plasma harmonic studies can lead to the creation of an attractive field of laser ablation induced high-order harmonic generation spectroscopy.

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High-order harmonic generation in carbon vapor and low charged plasma

Cited by 92 publications

References 25 publications

Optimization of harmonic generation from boron plasma

Optimization of harmonic generation from boron plasma

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

New Approaches in Frequency Conversion of Laser Radiation in Plasma Plumes

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