Optical harmonics generation in low-temperature laser-produced plasmas

Ganeev, R. A.; Redkorechev, V. I.; Usmanov, T.

doi:10.1016/s0030-4018(96)00633-5

Cited by 66 publications

(18 citation statements)

References 13 publications

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“…Molecular systems are also presently under consideration~Flettner et al, 2003!, due to their enhanced nonlinear susceptibility. Meanwhile, ablation generated by laser-solid interaction has long been considered as a medium for frequency conversion in various schemes~Akiyama et al, 1992;Ganeev et al, 1997!. However, the maximum observed harmonic order generated at these conditions was limited to 11th~G aneev et al , 1997!…”

Section: Ablation Harmonicsmentioning

confidence: 99%

Experimental prospects at the Canadian advanced laser light source facility

et al. 2006

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We describe here the present status of the Advanced Laser Light Source~ALLS! facility, a state-of-the-art multi-beam Ti:sapphire laser system presently under construction in Canada. ALLS is a national user facility to be commissioned in 2005 at the INRS campus near Montreal. The 25 fs ALLS multi-beam laser system has three components, each with different repetition rate and output energy. These multiple laser beams will be used to generate a "rainbow" of femtosecond pulses from the far infrared to hard X-rays, which can be combined to perform unique experiments, such as dynamic molecular imaging. In this paper, we describe two examples of experiments that are planned by our group with the ALLS facility. The first is the highly efficient generation of high-order harmonics using ablation medium. We demonstrate the generation of up to the 53 rd harmonics~l ϭ 15 nm! of a Ti:sapphire laser pulse~150 fs, 10 mJ!, using pre-pulse~210 ps, 24 mJ! produced boron ablation as the nonlinear medium. The second example is the demonstration of in-line phase-contrast imaging with an ultrafast~300 fs! laser-based hard X-ray source~Mo K-a line!. Images of biological samples have shown great enhancement of contrast due to this technique, distinguishing details that are barely observable or even undetectable in absorption images.

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Section: Ablation Harmonicsmentioning

confidence: 99%

Experimental prospects at the Canadian advanced laser light source facility

et al. 2006

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“…Typical pulse energies were in the range of 20-650 mJ. The beam was focused with a 20 cm focal length lens to a spot of 0.040 mm diameter, so that laser intensities in the harmonic generating region reached values of 1.0×10 11 -3.5×10 12 W/cm 2 . The delay between this driving pulse and the ablation pulse was controlled electronically in the range from 0 to 10 s.…”

Section: Methodsmentioning

confidence: 99%

“…[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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Section: ´çíöüçç ôñôõñâðëç ëôôîçAeñäâðëì åçðçóâùëë äþôûëø åâóïñðëí unclassified

High order harmonics generation in laser surface ablation: current trends

Ganeev¹

2013

Успехи физических наук

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Optical harmonics generation in low-temperature laser-produced plasmas

Cited by 66 publications

References 13 publications

Experimental prospects at the Canadian advanced laser light source facility

Experimental prospects at the Canadian advanced laser light source facility

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

High order harmonics generation in laser surface ablation: current trends

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