Control of quasi-phase-matching of high-harmonics in a spatially structured plasma

Wöstmann, Michael; Splitthoff, Lukas J.; Zacharias, H.

doi:10.1364/oe.26.014524

Cited by 47 publications

(18 citation statements)

References 42 publications

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“…Application of this concept in the case of the shorter-wavelength region requires conditions where the absorption of generating harmonic waves becomes insignificant with regard to the enhancement of this radiation in the conditions where the transfer of energy from driving to harmonic waves occurs at similar phase velocities. Since then, QPM has been demonstrated in gaseous [11,12,13,14] and plasma [15,16] media. One of the approaches here is the division of an extended medium into groups of smaller media separated by a vacuum.…”

Section: Introductionmentioning

confidence: 99%

Effects of Laser Plasma Formation on Quasi-Phase Matching of High-Order Harmonics from Nanoparticles and Atoms

et al. 2019

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The application of nanoparticles (NPs) and quasi-phase matching (QPM) each play an important role in the enhancement of high-order harmonics (HHG) of ultrashort laser pulses. We analyze various regimes of nanoparticle plasma formation for the creation conditions for maximal QPM-induced enhancement of the groups of harmonics in the extreme ultraviolet (XUV). Laser plasmas were formed on the surfaces of NPs- and microparticle (MPs)-contained targets using ablation by nanosecond, picosecond, and femtosecond pulses. Different conditions of laser plasma formation (extended and perforated plasma) and variable concentrations of free electrons in these three cases of laser ablation led to modifications of QPM conditions. We demonstrate novel approaches in the optimization of QPM at the conditions of laser ablation of NPs and MPs by pulses of different durations. The formation of QPM conditions using femtosecond and picosecond heating pulses during HHG in such plasmas allowed the growth of conversion efficiency of the groups of harmonics, with the enhancement factors exceeding 25× in different ranges of XUV, contrary to less efficient QPM in the case of nanosecond pulse-induced ablation.

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Section: Introductionmentioning

confidence: 99%

Effects of Laser Plasma Formation on Quasi-Phase Matching of High-Order Harmonics from Nanoparticles and Atoms

et al. 2019

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“…The intensity of the 23rd harmonic is enhanced by the highest possible factor of 16 compared to the attainable intensity in unmodulated plasmas. Further details are to be found in [8]. Fig.…”

Section: Resultsmentioning

confidence: 99%

Quasi-phase-matched high harmonic generation in structured plasmas

2019

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Structured plasmas are employed in order to realize the quasi-phase-matched generation of high harmonics. The plasma originates from laser ablated solids leading to the appearance of multiple separated jets. By altering the shape of the solid the dimensions of the plasma structure are easily optimized. Combining optimal jet widths and spacing the maximum enhancement of the harmonic intensity by a factor of 16 is observed after four plasma jets.

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“…The demonstration of the high flux of harmonics from different plasmas opens doors for further developments in the nonlinear spectroscopy of ablated materials. With the demonstration of highest average flux of harmonics reported so far, one can define the plasma as a very effective medium for coherent XUV sources formation [49][50][51].…”

Section: Discussionmentioning

confidence: 99%

Application of 150 kHz Laser for High-Order Harmonic Generation in Different Plasmas

et al. 2020

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Application of high pulse repetition rate lasers opens the way for increasing the average flux of the high-order harmonics generating in the ions- and nanoparticles-containing plasmas ablated on the surfaces of various metal targets. We demonstrate the harmonic generation of 37 fs, 150 kHz, 1030 nm, 0.5 mJ pulses in different plasmas. The formation of plasma plumes on the surfaces of carbon, titanium, boron, zinc, and manganese targets was performed during laser ablation, using 250 fs pulses from the same laser. The ablation of the mixed powder of boron nanoparticles and silver microparticles was used for generation of harmonics with high yield. Harmonics up to the fortieth orders from the carbon plasma were obtained. The estimated conversion efficiencies in laser-produced plasmas were ≤10−5. The photon flux for a single harmonic generating in carbon plasma was estimated to be 8 × 1013 photons/s.

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Control of quasi-phase-matching of high-harmonics in a spatially structured plasma

Cited by 47 publications

References 42 publications

Effects of Laser Plasma Formation on Quasi-Phase Matching of High-Order Harmonics from Nanoparticles and Atoms

Effects of Laser Plasma Formation on Quasi-Phase Matching of High-Order Harmonics from Nanoparticles and Atoms

Quasi-phase-matched high harmonic generation in structured plasmas

Application of 150 kHz Laser for High-Order Harmonic Generation in Different Plasmas

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